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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
Many source files in the tree are missing licensing information, which makes it harder for compliance tools to determine the correct license. By default all files without license information are under the default license of the kernel, which is GPL version 2. Update the files which contain no license information with the 'GPL-2.0' SPDX license identifier. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This patch is based on work done by Thomas Gleixner and Kate Stewart and Philippe Ombredanne. How this work was done: Patches were generated and checked against linux-4.14-rc6 for a subset of the use cases: - file had no licensing information it it. - file was a */uapi/* one with no licensing information in it, - file was a */uapi/* one with existing licensing information, Further patches will be generated in subsequent months to fix up cases where non-standard license headers were used, and references to license had to be inferred by heuristics based on keywords. The analysis to determine which SPDX License Identifier to be applied to a file was done in a spreadsheet of side by side results from of the output of two independent scanners (ScanCode & Windriver) producing SPDX tag:value files created by Philippe Ombredanne. Philippe prepared the base worksheet, and did an initial spot review of a few 1000 files. The 4.13 kernel was the starting point of the analysis with 60,537 files assessed. Kate Stewart did a file by file comparison of the scanner results in the spreadsheet to determine which SPDX license identifier(s) to be applied to the file. She confirmed any determination that was not immediately clear with lawyers working with the Linux Foundation. Criteria used to select files for SPDX license identifier tagging was: - Files considered eligible had to be source code files. - Make and config files were included as candidates if they contained >5 lines of source - File already had some variant of a license header in it (even if <5 lines). All documentation files were explicitly excluded. The following heuristics were used to determine which SPDX license identifiers to apply. - when both scanners couldn't find any license traces, file was considered to have no license information in it, and the top level COPYING file license applied. For non */uapi/* files that summary was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 11139 and resulted in the first patch in this series. If that file was a */uapi/* path one, it was "GPL-2.0 WITH Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 WITH Linux-syscall-note 930 and resulted in the second patch in this series. - if a file had some form of licensing information in it, and was one of the */uapi/* ones, it was denoted with the Linux-syscall-note if any GPL family license was found in the file or had no licensing in it (per prior point). Results summary: SPDX license identifier # files ---------------------------------------------------|------ GPL-2.0 WITH Linux-syscall-note 270 GPL-2.0+ WITH Linux-syscall-note 169 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17 LGPL-2.1+ WITH Linux-syscall-note 15 GPL-1.0+ WITH Linux-syscall-note 14 ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5 LGPL-2.0+ WITH Linux-syscall-note 4 LGPL-2.1 WITH Linux-syscall-note 3 ((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3 ((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1 and that resulted in the third patch in this series. - when the two scanners agreed on the detected license(s), that became the concluded license(s). - when there was disagreement between the two scanners (one detected a license but the other didn't, or they both detected different licenses) a manual inspection of the file occurred. - In most cases a manual inspection of the information in the file resulted in a clear resolution of the license that should apply (and which scanner probably needed to revisit its heuristics). - When it was not immediately clear, the license identifier was confirmed with lawyers working with the Linux Foundation. - If there was any question as to the appropriate license identifier, the file was flagged for further research and to be revisited later in time. In total, over 70 hours of logged manual review was done on the spreadsheet to determine the SPDX license identifiers to apply to the source files by Kate, Philippe, Thomas and, in some cases, confirmation by lawyers working with the Linux Foundation. Kate also obtained a third independent scan of the 4.13 code base from FOSSology, and compared selected files where the other two scanners disagreed against that SPDX file, to see if there was new insights. The Windriver scanner is based on an older version of FOSSology in part, so they are related. Thomas did random spot checks in about 500 files from the spreadsheets for the uapi headers and agreed with SPDX license identifier in the files he inspected. For the non-uapi files Thomas did random spot checks in about 15000 files. In initial set of patches against 4.14-rc6, 3 files were found to have copy/paste license identifier errors, and have been fixed to reflect the correct identifier. Additionally Philippe spent 10 hours this week doing a detailed manual inspection and review of the 12,461 patched files from the initial patch version early this week with: - a full scancode scan run, collecting the matched texts, detected license ids and scores - reviewing anything where there was a license detected (about 500+ files) to ensure that the applied SPDX license was correct - reviewing anything where there was no detection but the patch license was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied SPDX license was correct This produced a worksheet with 20 files needing minor correction. This worksheet was then exported into 3 different .csv files for the different types of files to be modified. These .csv files were then reviewed by Greg. Thomas wrote a script to parse the csv files and add the proper SPDX tag to the file, in the format that the file expected. This script was further refined by Greg based on the output to detect more types of files automatically and to distinguish between header and source .c files (which need different comment types.) Finally Greg ran the script using the .csv files to generate the patches. Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
702 lines
18 KiB
C
702 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* kernel/lockdep_proc.c
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*
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* Runtime locking correctness validator
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*
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* Started by Ingo Molnar:
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*
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* Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
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* Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra
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*
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* Code for /proc/lockdep and /proc/lockdep_stats:
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*
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*/
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#include <linux/export.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/kallsyms.h>
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#include <linux/debug_locks.h>
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#include <linux/vmalloc.h>
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#include <linux/sort.h>
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#include <linux/uaccess.h>
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#include <asm/div64.h>
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#include "lockdep_internals.h"
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static void *l_next(struct seq_file *m, void *v, loff_t *pos)
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{
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return seq_list_next(v, &all_lock_classes, pos);
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}
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static void *l_start(struct seq_file *m, loff_t *pos)
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{
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return seq_list_start_head(&all_lock_classes, *pos);
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}
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static void l_stop(struct seq_file *m, void *v)
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{
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}
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static void print_name(struct seq_file *m, struct lock_class *class)
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{
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char str[KSYM_NAME_LEN];
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const char *name = class->name;
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if (!name) {
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name = __get_key_name(class->key, str);
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seq_printf(m, "%s", name);
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} else{
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seq_printf(m, "%s", name);
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if (class->name_version > 1)
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seq_printf(m, "#%d", class->name_version);
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if (class->subclass)
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seq_printf(m, "/%d", class->subclass);
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}
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}
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static int l_show(struct seq_file *m, void *v)
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{
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struct lock_class *class = list_entry(v, struct lock_class, lock_entry);
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struct lock_list *entry;
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char usage[LOCK_USAGE_CHARS];
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if (v == &all_lock_classes) {
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seq_printf(m, "all lock classes:\n");
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return 0;
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}
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seq_printf(m, "%p", class->key);
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#ifdef CONFIG_DEBUG_LOCKDEP
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seq_printf(m, " OPS:%8ld", class->ops);
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#endif
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#ifdef CONFIG_PROVE_LOCKING
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seq_printf(m, " FD:%5ld", lockdep_count_forward_deps(class));
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seq_printf(m, " BD:%5ld", lockdep_count_backward_deps(class));
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#endif
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get_usage_chars(class, usage);
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seq_printf(m, " %s", usage);
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seq_printf(m, ": ");
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print_name(m, class);
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seq_puts(m, "\n");
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list_for_each_entry(entry, &class->locks_after, entry) {
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if (entry->distance == 1) {
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seq_printf(m, " -> [%p] ", entry->class->key);
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print_name(m, entry->class);
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seq_puts(m, "\n");
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}
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}
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seq_puts(m, "\n");
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return 0;
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}
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static const struct seq_operations lockdep_ops = {
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.start = l_start,
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.next = l_next,
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.stop = l_stop,
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.show = l_show,
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};
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static int lockdep_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &lockdep_ops);
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}
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static const struct file_operations proc_lockdep_operations = {
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.open = lockdep_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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#ifdef CONFIG_PROVE_LOCKING
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static void *lc_start(struct seq_file *m, loff_t *pos)
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{
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if (*pos == 0)
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return SEQ_START_TOKEN;
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if (*pos - 1 < nr_lock_chains)
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return lock_chains + (*pos - 1);
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return NULL;
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}
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static void *lc_next(struct seq_file *m, void *v, loff_t *pos)
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{
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(*pos)++;
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return lc_start(m, pos);
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}
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static void lc_stop(struct seq_file *m, void *v)
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{
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}
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static int lc_show(struct seq_file *m, void *v)
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{
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struct lock_chain *chain = v;
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struct lock_class *class;
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int i;
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if (v == SEQ_START_TOKEN) {
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if (nr_chain_hlocks > MAX_LOCKDEP_CHAIN_HLOCKS)
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seq_printf(m, "(buggered) ");
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seq_printf(m, "all lock chains:\n");
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return 0;
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}
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seq_printf(m, "irq_context: %d\n", chain->irq_context);
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for (i = 0; i < chain->depth; i++) {
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class = lock_chain_get_class(chain, i);
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if (!class->key)
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continue;
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seq_printf(m, "[%p] ", class->key);
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print_name(m, class);
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seq_puts(m, "\n");
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}
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seq_puts(m, "\n");
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return 0;
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}
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static const struct seq_operations lockdep_chains_ops = {
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.start = lc_start,
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.next = lc_next,
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.stop = lc_stop,
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.show = lc_show,
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};
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static int lockdep_chains_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &lockdep_chains_ops);
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}
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static const struct file_operations proc_lockdep_chains_operations = {
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.open = lockdep_chains_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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#endif /* CONFIG_PROVE_LOCKING */
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static void lockdep_stats_debug_show(struct seq_file *m)
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{
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#ifdef CONFIG_DEBUG_LOCKDEP
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unsigned long long hi1 = debug_atomic_read(hardirqs_on_events),
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hi2 = debug_atomic_read(hardirqs_off_events),
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hr1 = debug_atomic_read(redundant_hardirqs_on),
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hr2 = debug_atomic_read(redundant_hardirqs_off),
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si1 = debug_atomic_read(softirqs_on_events),
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si2 = debug_atomic_read(softirqs_off_events),
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sr1 = debug_atomic_read(redundant_softirqs_on),
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sr2 = debug_atomic_read(redundant_softirqs_off);
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seq_printf(m, " chain lookup misses: %11llu\n",
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debug_atomic_read(chain_lookup_misses));
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seq_printf(m, " chain lookup hits: %11llu\n",
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debug_atomic_read(chain_lookup_hits));
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seq_printf(m, " cyclic checks: %11llu\n",
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debug_atomic_read(nr_cyclic_checks));
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seq_printf(m, " redundant checks: %11llu\n",
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debug_atomic_read(nr_redundant_checks));
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seq_printf(m, " redundant links: %11llu\n",
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debug_atomic_read(nr_redundant));
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seq_printf(m, " find-mask forwards checks: %11llu\n",
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debug_atomic_read(nr_find_usage_forwards_checks));
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seq_printf(m, " find-mask backwards checks: %11llu\n",
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debug_atomic_read(nr_find_usage_backwards_checks));
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seq_printf(m, " hardirq on events: %11llu\n", hi1);
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seq_printf(m, " hardirq off events: %11llu\n", hi2);
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seq_printf(m, " redundant hardirq ons: %11llu\n", hr1);
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seq_printf(m, " redundant hardirq offs: %11llu\n", hr2);
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seq_printf(m, " softirq on events: %11llu\n", si1);
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seq_printf(m, " softirq off events: %11llu\n", si2);
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seq_printf(m, " redundant softirq ons: %11llu\n", sr1);
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seq_printf(m, " redundant softirq offs: %11llu\n", sr2);
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#endif
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}
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static int lockdep_stats_show(struct seq_file *m, void *v)
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{
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struct lock_class *class;
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unsigned long nr_unused = 0, nr_uncategorized = 0,
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nr_irq_safe = 0, nr_irq_unsafe = 0,
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nr_softirq_safe = 0, nr_softirq_unsafe = 0,
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nr_hardirq_safe = 0, nr_hardirq_unsafe = 0,
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nr_irq_read_safe = 0, nr_irq_read_unsafe = 0,
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nr_softirq_read_safe = 0, nr_softirq_read_unsafe = 0,
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nr_hardirq_read_safe = 0, nr_hardirq_read_unsafe = 0,
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sum_forward_deps = 0;
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list_for_each_entry(class, &all_lock_classes, lock_entry) {
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if (class->usage_mask == 0)
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nr_unused++;
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if (class->usage_mask == LOCKF_USED)
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nr_uncategorized++;
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if (class->usage_mask & LOCKF_USED_IN_IRQ)
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nr_irq_safe++;
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if (class->usage_mask & LOCKF_ENABLED_IRQ)
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nr_irq_unsafe++;
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if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ)
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nr_softirq_safe++;
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if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ)
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nr_softirq_unsafe++;
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if (class->usage_mask & LOCKF_USED_IN_HARDIRQ)
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nr_hardirq_safe++;
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if (class->usage_mask & LOCKF_ENABLED_HARDIRQ)
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nr_hardirq_unsafe++;
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if (class->usage_mask & LOCKF_USED_IN_IRQ_READ)
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nr_irq_read_safe++;
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if (class->usage_mask & LOCKF_ENABLED_IRQ_READ)
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nr_irq_read_unsafe++;
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if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ)
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nr_softirq_read_safe++;
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if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ_READ)
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nr_softirq_read_unsafe++;
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if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ)
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nr_hardirq_read_safe++;
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if (class->usage_mask & LOCKF_ENABLED_HARDIRQ_READ)
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nr_hardirq_read_unsafe++;
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#ifdef CONFIG_PROVE_LOCKING
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sum_forward_deps += lockdep_count_forward_deps(class);
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#endif
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}
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#ifdef CONFIG_DEBUG_LOCKDEP
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DEBUG_LOCKS_WARN_ON(debug_atomic_read(nr_unused_locks) != nr_unused);
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#endif
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seq_printf(m, " lock-classes: %11lu [max: %lu]\n",
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nr_lock_classes, MAX_LOCKDEP_KEYS);
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seq_printf(m, " direct dependencies: %11lu [max: %lu]\n",
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nr_list_entries, MAX_LOCKDEP_ENTRIES);
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seq_printf(m, " indirect dependencies: %11lu\n",
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sum_forward_deps);
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/*
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* Total number of dependencies:
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*
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* All irq-safe locks may nest inside irq-unsafe locks,
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* plus all the other known dependencies:
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*/
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seq_printf(m, " all direct dependencies: %11lu\n",
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nr_irq_unsafe * nr_irq_safe +
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nr_hardirq_unsafe * nr_hardirq_safe +
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nr_list_entries);
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#ifdef CONFIG_PROVE_LOCKING
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seq_printf(m, " dependency chains: %11lu [max: %lu]\n",
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nr_lock_chains, MAX_LOCKDEP_CHAINS);
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seq_printf(m, " dependency chain hlocks: %11d [max: %lu]\n",
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nr_chain_hlocks, MAX_LOCKDEP_CHAIN_HLOCKS);
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#endif
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#ifdef CONFIG_TRACE_IRQFLAGS
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seq_printf(m, " in-hardirq chains: %11u\n",
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nr_hardirq_chains);
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seq_printf(m, " in-softirq chains: %11u\n",
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nr_softirq_chains);
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#endif
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seq_printf(m, " in-process chains: %11u\n",
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nr_process_chains);
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seq_printf(m, " stack-trace entries: %11lu [max: %lu]\n",
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nr_stack_trace_entries, MAX_STACK_TRACE_ENTRIES);
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seq_printf(m, " combined max dependencies: %11u\n",
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(nr_hardirq_chains + 1) *
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(nr_softirq_chains + 1) *
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(nr_process_chains + 1)
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);
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seq_printf(m, " hardirq-safe locks: %11lu\n",
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nr_hardirq_safe);
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seq_printf(m, " hardirq-unsafe locks: %11lu\n",
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nr_hardirq_unsafe);
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seq_printf(m, " softirq-safe locks: %11lu\n",
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nr_softirq_safe);
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seq_printf(m, " softirq-unsafe locks: %11lu\n",
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nr_softirq_unsafe);
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seq_printf(m, " irq-safe locks: %11lu\n",
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nr_irq_safe);
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seq_printf(m, " irq-unsafe locks: %11lu\n",
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nr_irq_unsafe);
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seq_printf(m, " hardirq-read-safe locks: %11lu\n",
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nr_hardirq_read_safe);
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seq_printf(m, " hardirq-read-unsafe locks: %11lu\n",
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nr_hardirq_read_unsafe);
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seq_printf(m, " softirq-read-safe locks: %11lu\n",
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nr_softirq_read_safe);
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seq_printf(m, " softirq-read-unsafe locks: %11lu\n",
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nr_softirq_read_unsafe);
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seq_printf(m, " irq-read-safe locks: %11lu\n",
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nr_irq_read_safe);
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seq_printf(m, " irq-read-unsafe locks: %11lu\n",
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nr_irq_read_unsafe);
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seq_printf(m, " uncategorized locks: %11lu\n",
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nr_uncategorized);
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seq_printf(m, " unused locks: %11lu\n",
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nr_unused);
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seq_printf(m, " max locking depth: %11u\n",
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max_lockdep_depth);
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#ifdef CONFIG_PROVE_LOCKING
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seq_printf(m, " max bfs queue depth: %11u\n",
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max_bfs_queue_depth);
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#endif
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lockdep_stats_debug_show(m);
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seq_printf(m, " debug_locks: %11u\n",
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debug_locks);
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return 0;
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}
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static int lockdep_stats_open(struct inode *inode, struct file *file)
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{
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return single_open(file, lockdep_stats_show, NULL);
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}
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static const struct file_operations proc_lockdep_stats_operations = {
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.open = lockdep_stats_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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#ifdef CONFIG_LOCK_STAT
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struct lock_stat_data {
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struct lock_class *class;
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struct lock_class_stats stats;
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};
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struct lock_stat_seq {
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struct lock_stat_data *iter_end;
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|
struct lock_stat_data stats[MAX_LOCKDEP_KEYS];
|
|
};
|
|
|
|
/*
|
|
* sort on absolute number of contentions
|
|
*/
|
|
static int lock_stat_cmp(const void *l, const void *r)
|
|
{
|
|
const struct lock_stat_data *dl = l, *dr = r;
|
|
unsigned long nl, nr;
|
|
|
|
nl = dl->stats.read_waittime.nr + dl->stats.write_waittime.nr;
|
|
nr = dr->stats.read_waittime.nr + dr->stats.write_waittime.nr;
|
|
|
|
return nr - nl;
|
|
}
|
|
|
|
static void seq_line(struct seq_file *m, char c, int offset, int length)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < offset; i++)
|
|
seq_puts(m, " ");
|
|
for (i = 0; i < length; i++)
|
|
seq_printf(m, "%c", c);
|
|
seq_puts(m, "\n");
|
|
}
|
|
|
|
static void snprint_time(char *buf, size_t bufsiz, s64 nr)
|
|
{
|
|
s64 div;
|
|
s32 rem;
|
|
|
|
nr += 5; /* for display rounding */
|
|
div = div_s64_rem(nr, 1000, &rem);
|
|
snprintf(buf, bufsiz, "%lld.%02d", (long long)div, (int)rem/10);
|
|
}
|
|
|
|
static void seq_time(struct seq_file *m, s64 time)
|
|
{
|
|
char num[15];
|
|
|
|
snprint_time(num, sizeof(num), time);
|
|
seq_printf(m, " %14s", num);
|
|
}
|
|
|
|
static void seq_lock_time(struct seq_file *m, struct lock_time *lt)
|
|
{
|
|
seq_printf(m, "%14lu", lt->nr);
|
|
seq_time(m, lt->min);
|
|
seq_time(m, lt->max);
|
|
seq_time(m, lt->total);
|
|
seq_time(m, lt->nr ? div_s64(lt->total, lt->nr) : 0);
|
|
}
|
|
|
|
static void seq_stats(struct seq_file *m, struct lock_stat_data *data)
|
|
{
|
|
struct lockdep_subclass_key *ckey;
|
|
struct lock_class_stats *stats;
|
|
struct lock_class *class;
|
|
const char *cname;
|
|
int i, namelen;
|
|
char name[39];
|
|
|
|
class = data->class;
|
|
stats = &data->stats;
|
|
|
|
namelen = 38;
|
|
if (class->name_version > 1)
|
|
namelen -= 2; /* XXX truncates versions > 9 */
|
|
if (class->subclass)
|
|
namelen -= 2;
|
|
|
|
rcu_read_lock_sched();
|
|
cname = rcu_dereference_sched(class->name);
|
|
ckey = rcu_dereference_sched(class->key);
|
|
|
|
if (!cname && !ckey) {
|
|
rcu_read_unlock_sched();
|
|
return;
|
|
|
|
} else if (!cname) {
|
|
char str[KSYM_NAME_LEN];
|
|
const char *key_name;
|
|
|
|
key_name = __get_key_name(ckey, str);
|
|
snprintf(name, namelen, "%s", key_name);
|
|
} else {
|
|
snprintf(name, namelen, "%s", cname);
|
|
}
|
|
rcu_read_unlock_sched();
|
|
|
|
namelen = strlen(name);
|
|
if (class->name_version > 1) {
|
|
snprintf(name+namelen, 3, "#%d", class->name_version);
|
|
namelen += 2;
|
|
}
|
|
if (class->subclass) {
|
|
snprintf(name+namelen, 3, "/%d", class->subclass);
|
|
namelen += 2;
|
|
}
|
|
|
|
if (stats->write_holdtime.nr) {
|
|
if (stats->read_holdtime.nr)
|
|
seq_printf(m, "%38s-W:", name);
|
|
else
|
|
seq_printf(m, "%40s:", name);
|
|
|
|
seq_printf(m, "%14lu ", stats->bounces[bounce_contended_write]);
|
|
seq_lock_time(m, &stats->write_waittime);
|
|
seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_write]);
|
|
seq_lock_time(m, &stats->write_holdtime);
|
|
seq_puts(m, "\n");
|
|
}
|
|
|
|
if (stats->read_holdtime.nr) {
|
|
seq_printf(m, "%38s-R:", name);
|
|
seq_printf(m, "%14lu ", stats->bounces[bounce_contended_read]);
|
|
seq_lock_time(m, &stats->read_waittime);
|
|
seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_read]);
|
|
seq_lock_time(m, &stats->read_holdtime);
|
|
seq_puts(m, "\n");
|
|
}
|
|
|
|
if (stats->read_waittime.nr + stats->write_waittime.nr == 0)
|
|
return;
|
|
|
|
if (stats->read_holdtime.nr)
|
|
namelen += 2;
|
|
|
|
for (i = 0; i < LOCKSTAT_POINTS; i++) {
|
|
char ip[32];
|
|
|
|
if (class->contention_point[i] == 0)
|
|
break;
|
|
|
|
if (!i)
|
|
seq_line(m, '-', 40-namelen, namelen);
|
|
|
|
snprintf(ip, sizeof(ip), "[<%p>]",
|
|
(void *)class->contention_point[i]);
|
|
seq_printf(m, "%40s %14lu %29s %pS\n",
|
|
name, stats->contention_point[i],
|
|
ip, (void *)class->contention_point[i]);
|
|
}
|
|
for (i = 0; i < LOCKSTAT_POINTS; i++) {
|
|
char ip[32];
|
|
|
|
if (class->contending_point[i] == 0)
|
|
break;
|
|
|
|
if (!i)
|
|
seq_line(m, '-', 40-namelen, namelen);
|
|
|
|
snprintf(ip, sizeof(ip), "[<%p>]",
|
|
(void *)class->contending_point[i]);
|
|
seq_printf(m, "%40s %14lu %29s %pS\n",
|
|
name, stats->contending_point[i],
|
|
ip, (void *)class->contending_point[i]);
|
|
}
|
|
if (i) {
|
|
seq_puts(m, "\n");
|
|
seq_line(m, '.', 0, 40 + 1 + 12 * (14 + 1));
|
|
seq_puts(m, "\n");
|
|
}
|
|
}
|
|
|
|
static void seq_header(struct seq_file *m)
|
|
{
|
|
seq_puts(m, "lock_stat version 0.4\n");
|
|
|
|
if (unlikely(!debug_locks))
|
|
seq_printf(m, "*WARNING* lock debugging disabled!! - possibly due to a lockdep warning\n");
|
|
|
|
seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1));
|
|
seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s %14s %14s "
|
|
"%14s %14s\n",
|
|
"class name",
|
|
"con-bounces",
|
|
"contentions",
|
|
"waittime-min",
|
|
"waittime-max",
|
|
"waittime-total",
|
|
"waittime-avg",
|
|
"acq-bounces",
|
|
"acquisitions",
|
|
"holdtime-min",
|
|
"holdtime-max",
|
|
"holdtime-total",
|
|
"holdtime-avg");
|
|
seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1));
|
|
seq_printf(m, "\n");
|
|
}
|
|
|
|
static void *ls_start(struct seq_file *m, loff_t *pos)
|
|
{
|
|
struct lock_stat_seq *data = m->private;
|
|
struct lock_stat_data *iter;
|
|
|
|
if (*pos == 0)
|
|
return SEQ_START_TOKEN;
|
|
|
|
iter = data->stats + (*pos - 1);
|
|
if (iter >= data->iter_end)
|
|
iter = NULL;
|
|
|
|
return iter;
|
|
}
|
|
|
|
static void *ls_next(struct seq_file *m, void *v, loff_t *pos)
|
|
{
|
|
(*pos)++;
|
|
return ls_start(m, pos);
|
|
}
|
|
|
|
static void ls_stop(struct seq_file *m, void *v)
|
|
{
|
|
}
|
|
|
|
static int ls_show(struct seq_file *m, void *v)
|
|
{
|
|
if (v == SEQ_START_TOKEN)
|
|
seq_header(m);
|
|
else
|
|
seq_stats(m, v);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations lockstat_ops = {
|
|
.start = ls_start,
|
|
.next = ls_next,
|
|
.stop = ls_stop,
|
|
.show = ls_show,
|
|
};
|
|
|
|
static int lock_stat_open(struct inode *inode, struct file *file)
|
|
{
|
|
int res;
|
|
struct lock_class *class;
|
|
struct lock_stat_seq *data = vmalloc(sizeof(struct lock_stat_seq));
|
|
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
res = seq_open(file, &lockstat_ops);
|
|
if (!res) {
|
|
struct lock_stat_data *iter = data->stats;
|
|
struct seq_file *m = file->private_data;
|
|
|
|
list_for_each_entry(class, &all_lock_classes, lock_entry) {
|
|
iter->class = class;
|
|
iter->stats = lock_stats(class);
|
|
iter++;
|
|
}
|
|
data->iter_end = iter;
|
|
|
|
sort(data->stats, data->iter_end - data->stats,
|
|
sizeof(struct lock_stat_data),
|
|
lock_stat_cmp, NULL);
|
|
|
|
m->private = data;
|
|
} else
|
|
vfree(data);
|
|
|
|
return res;
|
|
}
|
|
|
|
static ssize_t lock_stat_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct lock_class *class;
|
|
char c;
|
|
|
|
if (count) {
|
|
if (get_user(c, buf))
|
|
return -EFAULT;
|
|
|
|
if (c != '0')
|
|
return count;
|
|
|
|
list_for_each_entry(class, &all_lock_classes, lock_entry)
|
|
clear_lock_stats(class);
|
|
}
|
|
return count;
|
|
}
|
|
|
|
static int lock_stat_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct seq_file *seq = file->private_data;
|
|
|
|
vfree(seq->private);
|
|
return seq_release(inode, file);
|
|
}
|
|
|
|
static const struct file_operations proc_lock_stat_operations = {
|
|
.open = lock_stat_open,
|
|
.write = lock_stat_write,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = lock_stat_release,
|
|
};
|
|
#endif /* CONFIG_LOCK_STAT */
|
|
|
|
static int __init lockdep_proc_init(void)
|
|
{
|
|
proc_create("lockdep", S_IRUSR, NULL, &proc_lockdep_operations);
|
|
#ifdef CONFIG_PROVE_LOCKING
|
|
proc_create("lockdep_chains", S_IRUSR, NULL,
|
|
&proc_lockdep_chains_operations);
|
|
#endif
|
|
proc_create("lockdep_stats", S_IRUSR, NULL,
|
|
&proc_lockdep_stats_operations);
|
|
|
|
#ifdef CONFIG_LOCK_STAT
|
|
proc_create("lock_stat", S_IRUSR | S_IWUSR, NULL,
|
|
&proc_lock_stat_operations);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
__initcall(lockdep_proc_init);
|
|
|