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![Thomas Gleixner](/assets/img/avatar_default.png)
The smpboot threads rely on the park/unpark mechanism which binds per cpu threads on a particular core. Though the functionality is racy: CPU0 CPU1 CPU2 unpark(T) wake_up_process(T) clear(SHOULD_PARK) T runs leave parkme() due to !SHOULD_PARK bind_to(CPU2) BUG_ON(wrong CPU) We cannot let the tasks move themself to the target CPU as one of those tasks is actually the migration thread itself, which requires that it starts running on the target cpu right away. The solution to this problem is to prevent wakeups in park mode which are not from unpark(). That way we can guarantee that the association of the task to the target cpu is working correctly. Add a new task state (TASK_PARKED) which prevents other wakeups and use this state explicitly for the unpark wakeup. Peter noticed: Also, since the task state is visible to userspace and all the parked tasks are still in the PID space, its a good hint in ps and friends that these tasks aren't really there for the moment. The migration thread has another related issue. CPU0 CPU1 Bring up CPU2 create_thread(T) park(T) wait_for_completion() parkme() complete() sched_set_stop_task() schedule(TASK_PARKED) The sched_set_stop_task() call is issued while the task is on the runqueue of CPU1 and that confuses the hell out of the stop_task class on that cpu. So we need the same synchronizaion before sched_set_stop_task(). Reported-by: Dave Jones <davej@redhat.com> Reported-and-tested-by: Dave Hansen <dave@sr71.net> Reported-and-tested-by: Borislav Petkov <bp@alien8.de> Acked-by: Peter Ziljstra <peterz@infradead.org> Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Cc: dhillf@gmail.com Cc: Ingo Molnar <mingo@kernel.org> Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/alpine.LFD.2.02.1304091635430.21884@ionos Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
722 lines
18 KiB
C
722 lines
18 KiB
C
/*
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* linux/fs/proc/array.c
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*
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* Copyright (C) 1992 by Linus Torvalds
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* based on ideas by Darren Senn
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*
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* Fixes:
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* Michael. K. Johnson: stat,statm extensions.
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* <johnsonm@stolaf.edu>
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*
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* Pauline Middelink : Made cmdline,envline only break at '\0's, to
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* make sure SET_PROCTITLE works. Also removed
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* bad '!' which forced address recalculation for
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* EVERY character on the current page.
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* <middelin@polyware.iaf.nl>
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*
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* Danny ter Haar : added cpuinfo
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* <dth@cistron.nl>
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*
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* Alessandro Rubini : profile extension.
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* <rubini@ipvvis.unipv.it>
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*
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* Jeff Tranter : added BogoMips field to cpuinfo
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* <Jeff_Tranter@Mitel.COM>
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*
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* Bruno Haible : remove 4K limit for the maps file
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* <haible@ma2s2.mathematik.uni-karlsruhe.de>
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*
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* Yves Arrouye : remove removal of trailing spaces in get_array.
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* <Yves.Arrouye@marin.fdn.fr>
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*
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* Jerome Forissier : added per-CPU time information to /proc/stat
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* and /proc/<pid>/cpu extension
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* <forissier@isia.cma.fr>
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* - Incorporation and non-SMP safe operation
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* of forissier patch in 2.1.78 by
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* Hans Marcus <crowbar@concepts.nl>
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*
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* aeb@cwi.nl : /proc/partitions
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*
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*
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* Alan Cox : security fixes.
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* <alan@lxorguk.ukuu.org.uk>
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*
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* Al Viro : safe handling of mm_struct
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*
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* Gerhard Wichert : added BIGMEM support
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* Siemens AG <Gerhard.Wichert@pdb.siemens.de>
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*
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* Al Viro & Jeff Garzik : moved most of the thing into base.c and
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* : proc_misc.c. The rest may eventually go into
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* : base.c too.
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*/
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/time.h>
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#include <linux/kernel.h>
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#include <linux/kernel_stat.h>
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#include <linux/tty.h>
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#include <linux/string.h>
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#include <linux/mman.h>
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#include <linux/proc_fs.h>
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#include <linux/ioport.h>
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#include <linux/uaccess.h>
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#include <linux/io.h>
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#include <linux/mm.h>
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#include <linux/hugetlb.h>
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#include <linux/pagemap.h>
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#include <linux/swap.h>
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#include <linux/smp.h>
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#include <linux/signal.h>
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#include <linux/highmem.h>
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#include <linux/file.h>
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#include <linux/fdtable.h>
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#include <linux/times.h>
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#include <linux/cpuset.h>
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#include <linux/rcupdate.h>
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#include <linux/delayacct.h>
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#include <linux/seq_file.h>
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#include <linux/pid_namespace.h>
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#include <linux/ptrace.h>
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#include <linux/tracehook.h>
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#include <linux/user_namespace.h>
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#include <asm/pgtable.h>
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#include <asm/processor.h>
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#include "internal.h"
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static inline void task_name(struct seq_file *m, struct task_struct *p)
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{
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int i;
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char *buf, *end;
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char *name;
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char tcomm[sizeof(p->comm)];
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get_task_comm(tcomm, p);
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seq_puts(m, "Name:\t");
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end = m->buf + m->size;
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buf = m->buf + m->count;
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name = tcomm;
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i = sizeof(tcomm);
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while (i && (buf < end)) {
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unsigned char c = *name;
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name++;
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i--;
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*buf = c;
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if (!c)
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break;
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if (c == '\\') {
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buf++;
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if (buf < end)
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*buf++ = c;
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continue;
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}
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if (c == '\n') {
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*buf++ = '\\';
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if (buf < end)
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*buf++ = 'n';
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continue;
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}
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buf++;
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}
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m->count = buf - m->buf;
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seq_putc(m, '\n');
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}
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/*
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* The task state array is a strange "bitmap" of
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* reasons to sleep. Thus "running" is zero, and
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* you can test for combinations of others with
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* simple bit tests.
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*/
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static const char * const task_state_array[] = {
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"R (running)", /* 0 */
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"S (sleeping)", /* 1 */
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"D (disk sleep)", /* 2 */
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"T (stopped)", /* 4 */
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"t (tracing stop)", /* 8 */
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"Z (zombie)", /* 16 */
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"X (dead)", /* 32 */
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"x (dead)", /* 64 */
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"K (wakekill)", /* 128 */
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"W (waking)", /* 256 */
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"P (parked)", /* 512 */
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};
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static inline const char *get_task_state(struct task_struct *tsk)
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{
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unsigned int state = (tsk->state & TASK_REPORT) | tsk->exit_state;
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const char * const *p = &task_state_array[0];
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BUILD_BUG_ON(1 + ilog2(TASK_STATE_MAX) != ARRAY_SIZE(task_state_array));
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while (state) {
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p++;
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state >>= 1;
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}
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return *p;
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}
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static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
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struct pid *pid, struct task_struct *p)
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{
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struct user_namespace *user_ns = seq_user_ns(m);
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struct group_info *group_info;
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int g;
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struct fdtable *fdt = NULL;
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const struct cred *cred;
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pid_t ppid, tpid;
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rcu_read_lock();
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ppid = pid_alive(p) ?
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task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
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tpid = 0;
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if (pid_alive(p)) {
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struct task_struct *tracer = ptrace_parent(p);
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if (tracer)
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tpid = task_pid_nr_ns(tracer, ns);
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}
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cred = get_task_cred(p);
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seq_printf(m,
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"State:\t%s\n"
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"Tgid:\t%d\n"
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"Pid:\t%d\n"
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"PPid:\t%d\n"
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"TracerPid:\t%d\n"
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"Uid:\t%d\t%d\t%d\t%d\n"
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"Gid:\t%d\t%d\t%d\t%d\n",
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get_task_state(p),
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task_tgid_nr_ns(p, ns),
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pid_nr_ns(pid, ns),
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ppid, tpid,
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from_kuid_munged(user_ns, cred->uid),
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from_kuid_munged(user_ns, cred->euid),
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from_kuid_munged(user_ns, cred->suid),
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from_kuid_munged(user_ns, cred->fsuid),
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from_kgid_munged(user_ns, cred->gid),
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from_kgid_munged(user_ns, cred->egid),
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from_kgid_munged(user_ns, cred->sgid),
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from_kgid_munged(user_ns, cred->fsgid));
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task_lock(p);
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if (p->files)
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fdt = files_fdtable(p->files);
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seq_printf(m,
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"FDSize:\t%d\n"
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"Groups:\t",
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fdt ? fdt->max_fds : 0);
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rcu_read_unlock();
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group_info = cred->group_info;
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task_unlock(p);
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for (g = 0; g < group_info->ngroups; g++)
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seq_printf(m, "%d ",
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from_kgid_munged(user_ns, GROUP_AT(group_info, g)));
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put_cred(cred);
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seq_putc(m, '\n');
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}
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void render_sigset_t(struct seq_file *m, const char *header,
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sigset_t *set)
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{
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int i;
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seq_puts(m, header);
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i = _NSIG;
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do {
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int x = 0;
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i -= 4;
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if (sigismember(set, i+1)) x |= 1;
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if (sigismember(set, i+2)) x |= 2;
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if (sigismember(set, i+3)) x |= 4;
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if (sigismember(set, i+4)) x |= 8;
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seq_printf(m, "%x", x);
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} while (i >= 4);
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seq_putc(m, '\n');
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}
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static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
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sigset_t *catch)
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{
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struct k_sigaction *k;
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int i;
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k = p->sighand->action;
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for (i = 1; i <= _NSIG; ++i, ++k) {
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if (k->sa.sa_handler == SIG_IGN)
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sigaddset(ign, i);
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else if (k->sa.sa_handler != SIG_DFL)
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sigaddset(catch, i);
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}
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}
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static inline void task_sig(struct seq_file *m, struct task_struct *p)
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{
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unsigned long flags;
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sigset_t pending, shpending, blocked, ignored, caught;
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int num_threads = 0;
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unsigned long qsize = 0;
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unsigned long qlim = 0;
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sigemptyset(&pending);
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sigemptyset(&shpending);
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sigemptyset(&blocked);
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sigemptyset(&ignored);
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sigemptyset(&caught);
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if (lock_task_sighand(p, &flags)) {
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pending = p->pending.signal;
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shpending = p->signal->shared_pending.signal;
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blocked = p->blocked;
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collect_sigign_sigcatch(p, &ignored, &caught);
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num_threads = get_nr_threads(p);
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rcu_read_lock(); /* FIXME: is this correct? */
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qsize = atomic_read(&__task_cred(p)->user->sigpending);
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rcu_read_unlock();
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qlim = task_rlimit(p, RLIMIT_SIGPENDING);
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unlock_task_sighand(p, &flags);
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}
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seq_printf(m, "Threads:\t%d\n", num_threads);
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seq_printf(m, "SigQ:\t%lu/%lu\n", qsize, qlim);
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/* render them all */
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render_sigset_t(m, "SigPnd:\t", &pending);
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render_sigset_t(m, "ShdPnd:\t", &shpending);
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render_sigset_t(m, "SigBlk:\t", &blocked);
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render_sigset_t(m, "SigIgn:\t", &ignored);
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render_sigset_t(m, "SigCgt:\t", &caught);
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}
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static void render_cap_t(struct seq_file *m, const char *header,
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kernel_cap_t *a)
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{
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unsigned __capi;
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seq_puts(m, header);
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CAP_FOR_EACH_U32(__capi) {
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seq_printf(m, "%08x",
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a->cap[(_KERNEL_CAPABILITY_U32S-1) - __capi]);
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}
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seq_putc(m, '\n');
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}
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/* Remove non-existent capabilities */
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#define NORM_CAPS(v) (v.cap[CAP_TO_INDEX(CAP_LAST_CAP)] &= \
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CAP_TO_MASK(CAP_LAST_CAP + 1) - 1)
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static inline void task_cap(struct seq_file *m, struct task_struct *p)
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{
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const struct cred *cred;
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kernel_cap_t cap_inheritable, cap_permitted, cap_effective, cap_bset;
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rcu_read_lock();
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cred = __task_cred(p);
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cap_inheritable = cred->cap_inheritable;
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cap_permitted = cred->cap_permitted;
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cap_effective = cred->cap_effective;
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cap_bset = cred->cap_bset;
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rcu_read_unlock();
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NORM_CAPS(cap_inheritable);
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NORM_CAPS(cap_permitted);
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NORM_CAPS(cap_effective);
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NORM_CAPS(cap_bset);
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render_cap_t(m, "CapInh:\t", &cap_inheritable);
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render_cap_t(m, "CapPrm:\t", &cap_permitted);
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render_cap_t(m, "CapEff:\t", &cap_effective);
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render_cap_t(m, "CapBnd:\t", &cap_bset);
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}
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static inline void task_seccomp(struct seq_file *m, struct task_struct *p)
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{
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#ifdef CONFIG_SECCOMP
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seq_printf(m, "Seccomp:\t%d\n", p->seccomp.mode);
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#endif
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}
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static inline void task_context_switch_counts(struct seq_file *m,
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struct task_struct *p)
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{
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seq_printf(m, "voluntary_ctxt_switches:\t%lu\n"
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"nonvoluntary_ctxt_switches:\t%lu\n",
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p->nvcsw,
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p->nivcsw);
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}
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static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)
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{
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seq_puts(m, "Cpus_allowed:\t");
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seq_cpumask(m, &task->cpus_allowed);
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seq_putc(m, '\n');
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seq_puts(m, "Cpus_allowed_list:\t");
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seq_cpumask_list(m, &task->cpus_allowed);
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seq_putc(m, '\n');
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}
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int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
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struct pid *pid, struct task_struct *task)
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{
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struct mm_struct *mm = get_task_mm(task);
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task_name(m, task);
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task_state(m, ns, pid, task);
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if (mm) {
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task_mem(m, mm);
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mmput(mm);
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}
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task_sig(m, task);
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task_cap(m, task);
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task_seccomp(m, task);
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task_cpus_allowed(m, task);
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cpuset_task_status_allowed(m, task);
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task_context_switch_counts(m, task);
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return 0;
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}
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static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
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struct pid *pid, struct task_struct *task, int whole)
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{
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unsigned long vsize, eip, esp, wchan = ~0UL;
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int priority, nice;
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int tty_pgrp = -1, tty_nr = 0;
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sigset_t sigign, sigcatch;
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char state;
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pid_t ppid = 0, pgid = -1, sid = -1;
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int num_threads = 0;
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int permitted;
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struct mm_struct *mm;
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unsigned long long start_time;
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unsigned long cmin_flt = 0, cmaj_flt = 0;
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unsigned long min_flt = 0, maj_flt = 0;
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cputime_t cutime, cstime, utime, stime;
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cputime_t cgtime, gtime;
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unsigned long rsslim = 0;
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char tcomm[sizeof(task->comm)];
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unsigned long flags;
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state = *get_task_state(task);
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vsize = eip = esp = 0;
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permitted = ptrace_may_access(task, PTRACE_MODE_READ | PTRACE_MODE_NOAUDIT);
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mm = get_task_mm(task);
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if (mm) {
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vsize = task_vsize(mm);
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if (permitted) {
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eip = KSTK_EIP(task);
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esp = KSTK_ESP(task);
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}
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}
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get_task_comm(tcomm, task);
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sigemptyset(&sigign);
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sigemptyset(&sigcatch);
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cutime = cstime = utime = stime = 0;
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cgtime = gtime = 0;
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if (lock_task_sighand(task, &flags)) {
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struct signal_struct *sig = task->signal;
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if (sig->tty) {
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struct pid *pgrp = tty_get_pgrp(sig->tty);
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tty_pgrp = pid_nr_ns(pgrp, ns);
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put_pid(pgrp);
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tty_nr = new_encode_dev(tty_devnum(sig->tty));
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}
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num_threads = get_nr_threads(task);
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collect_sigign_sigcatch(task, &sigign, &sigcatch);
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cmin_flt = sig->cmin_flt;
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cmaj_flt = sig->cmaj_flt;
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cutime = sig->cutime;
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cstime = sig->cstime;
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cgtime = sig->cgtime;
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rsslim = ACCESS_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur);
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/* add up live thread stats at the group level */
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if (whole) {
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struct task_struct *t = task;
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do {
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min_flt += t->min_flt;
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maj_flt += t->maj_flt;
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gtime += task_gtime(t);
|
|
t = next_thread(t);
|
|
} while (t != task);
|
|
|
|
min_flt += sig->min_flt;
|
|
maj_flt += sig->maj_flt;
|
|
thread_group_cputime_adjusted(task, &utime, &stime);
|
|
gtime += sig->gtime;
|
|
}
|
|
|
|
sid = task_session_nr_ns(task, ns);
|
|
ppid = task_tgid_nr_ns(task->real_parent, ns);
|
|
pgid = task_pgrp_nr_ns(task, ns);
|
|
|
|
unlock_task_sighand(task, &flags);
|
|
}
|
|
|
|
if (permitted && (!whole || num_threads < 2))
|
|
wchan = get_wchan(task);
|
|
if (!whole) {
|
|
min_flt = task->min_flt;
|
|
maj_flt = task->maj_flt;
|
|
task_cputime_adjusted(task, &utime, &stime);
|
|
gtime = task_gtime(task);
|
|
}
|
|
|
|
/* scale priority and nice values from timeslices to -20..20 */
|
|
/* to make it look like a "normal" Unix priority/nice value */
|
|
priority = task_prio(task);
|
|
nice = task_nice(task);
|
|
|
|
/* Temporary variable needed for gcc-2.96 */
|
|
/* convert timespec -> nsec*/
|
|
start_time =
|
|
(unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC
|
|
+ task->real_start_time.tv_nsec;
|
|
/* convert nsec -> ticks */
|
|
start_time = nsec_to_clock_t(start_time);
|
|
|
|
seq_printf(m, "%d (%s) %c", pid_nr_ns(pid, ns), tcomm, state);
|
|
seq_put_decimal_ll(m, ' ', ppid);
|
|
seq_put_decimal_ll(m, ' ', pgid);
|
|
seq_put_decimal_ll(m, ' ', sid);
|
|
seq_put_decimal_ll(m, ' ', tty_nr);
|
|
seq_put_decimal_ll(m, ' ', tty_pgrp);
|
|
seq_put_decimal_ull(m, ' ', task->flags);
|
|
seq_put_decimal_ull(m, ' ', min_flt);
|
|
seq_put_decimal_ull(m, ' ', cmin_flt);
|
|
seq_put_decimal_ull(m, ' ', maj_flt);
|
|
seq_put_decimal_ull(m, ' ', cmaj_flt);
|
|
seq_put_decimal_ull(m, ' ', cputime_to_clock_t(utime));
|
|
seq_put_decimal_ull(m, ' ', cputime_to_clock_t(stime));
|
|
seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cutime));
|
|
seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cstime));
|
|
seq_put_decimal_ll(m, ' ', priority);
|
|
seq_put_decimal_ll(m, ' ', nice);
|
|
seq_put_decimal_ll(m, ' ', num_threads);
|
|
seq_put_decimal_ull(m, ' ', 0);
|
|
seq_put_decimal_ull(m, ' ', start_time);
|
|
seq_put_decimal_ull(m, ' ', vsize);
|
|
seq_put_decimal_ull(m, ' ', mm ? get_mm_rss(mm) : 0);
|
|
seq_put_decimal_ull(m, ' ', rsslim);
|
|
seq_put_decimal_ull(m, ' ', mm ? (permitted ? mm->start_code : 1) : 0);
|
|
seq_put_decimal_ull(m, ' ', mm ? (permitted ? mm->end_code : 1) : 0);
|
|
seq_put_decimal_ull(m, ' ', (permitted && mm) ? mm->start_stack : 0);
|
|
seq_put_decimal_ull(m, ' ', esp);
|
|
seq_put_decimal_ull(m, ' ', eip);
|
|
/* The signal information here is obsolete.
|
|
* It must be decimal for Linux 2.0 compatibility.
|
|
* Use /proc/#/status for real-time signals.
|
|
*/
|
|
seq_put_decimal_ull(m, ' ', task->pending.signal.sig[0] & 0x7fffffffUL);
|
|
seq_put_decimal_ull(m, ' ', task->blocked.sig[0] & 0x7fffffffUL);
|
|
seq_put_decimal_ull(m, ' ', sigign.sig[0] & 0x7fffffffUL);
|
|
seq_put_decimal_ull(m, ' ', sigcatch.sig[0] & 0x7fffffffUL);
|
|
seq_put_decimal_ull(m, ' ', wchan);
|
|
seq_put_decimal_ull(m, ' ', 0);
|
|
seq_put_decimal_ull(m, ' ', 0);
|
|
seq_put_decimal_ll(m, ' ', task->exit_signal);
|
|
seq_put_decimal_ll(m, ' ', task_cpu(task));
|
|
seq_put_decimal_ull(m, ' ', task->rt_priority);
|
|
seq_put_decimal_ull(m, ' ', task->policy);
|
|
seq_put_decimal_ull(m, ' ', delayacct_blkio_ticks(task));
|
|
seq_put_decimal_ull(m, ' ', cputime_to_clock_t(gtime));
|
|
seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cgtime));
|
|
|
|
if (mm && permitted) {
|
|
seq_put_decimal_ull(m, ' ', mm->start_data);
|
|
seq_put_decimal_ull(m, ' ', mm->end_data);
|
|
seq_put_decimal_ull(m, ' ', mm->start_brk);
|
|
seq_put_decimal_ull(m, ' ', mm->arg_start);
|
|
seq_put_decimal_ull(m, ' ', mm->arg_end);
|
|
seq_put_decimal_ull(m, ' ', mm->env_start);
|
|
seq_put_decimal_ull(m, ' ', mm->env_end);
|
|
} else
|
|
seq_printf(m, " 0 0 0 0 0 0 0");
|
|
|
|
if (permitted)
|
|
seq_put_decimal_ll(m, ' ', task->exit_code);
|
|
else
|
|
seq_put_decimal_ll(m, ' ', 0);
|
|
|
|
seq_putc(m, '\n');
|
|
if (mm)
|
|
mmput(mm);
|
|
return 0;
|
|
}
|
|
|
|
int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
|
|
struct pid *pid, struct task_struct *task)
|
|
{
|
|
return do_task_stat(m, ns, pid, task, 0);
|
|
}
|
|
|
|
int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
|
|
struct pid *pid, struct task_struct *task)
|
|
{
|
|
return do_task_stat(m, ns, pid, task, 1);
|
|
}
|
|
|
|
int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
|
|
struct pid *pid, struct task_struct *task)
|
|
{
|
|
unsigned long size = 0, resident = 0, shared = 0, text = 0, data = 0;
|
|
struct mm_struct *mm = get_task_mm(task);
|
|
|
|
if (mm) {
|
|
size = task_statm(mm, &shared, &text, &data, &resident);
|
|
mmput(mm);
|
|
}
|
|
/*
|
|
* For quick read, open code by putting numbers directly
|
|
* expected format is
|
|
* seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n",
|
|
* size, resident, shared, text, data);
|
|
*/
|
|
seq_put_decimal_ull(m, 0, size);
|
|
seq_put_decimal_ull(m, ' ', resident);
|
|
seq_put_decimal_ull(m, ' ', shared);
|
|
seq_put_decimal_ull(m, ' ', text);
|
|
seq_put_decimal_ull(m, ' ', 0);
|
|
seq_put_decimal_ull(m, ' ', data);
|
|
seq_put_decimal_ull(m, ' ', 0);
|
|
seq_putc(m, '\n');
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_CHECKPOINT_RESTORE
|
|
static struct pid *
|
|
get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos)
|
|
{
|
|
struct task_struct *start, *task;
|
|
struct pid *pid = NULL;
|
|
|
|
read_lock(&tasklist_lock);
|
|
|
|
start = pid_task(proc_pid(inode), PIDTYPE_PID);
|
|
if (!start)
|
|
goto out;
|
|
|
|
/*
|
|
* Lets try to continue searching first, this gives
|
|
* us significant speedup on children-rich processes.
|
|
*/
|
|
if (pid_prev) {
|
|
task = pid_task(pid_prev, PIDTYPE_PID);
|
|
if (task && task->real_parent == start &&
|
|
!(list_empty(&task->sibling))) {
|
|
if (list_is_last(&task->sibling, &start->children))
|
|
goto out;
|
|
task = list_first_entry(&task->sibling,
|
|
struct task_struct, sibling);
|
|
pid = get_pid(task_pid(task));
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Slow search case.
|
|
*
|
|
* We might miss some children here if children
|
|
* are exited while we were not holding the lock,
|
|
* but it was never promised to be accurate that
|
|
* much.
|
|
*
|
|
* "Just suppose that the parent sleeps, but N children
|
|
* exit after we printed their tids. Now the slow paths
|
|
* skips N extra children, we miss N tasks." (c)
|
|
*
|
|
* So one need to stop or freeze the leader and all
|
|
* its children to get a precise result.
|
|
*/
|
|
list_for_each_entry(task, &start->children, sibling) {
|
|
if (pos-- == 0) {
|
|
pid = get_pid(task_pid(task));
|
|
break;
|
|
}
|
|
}
|
|
|
|
out:
|
|
read_unlock(&tasklist_lock);
|
|
return pid;
|
|
}
|
|
|
|
static int children_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct inode *inode = seq->private;
|
|
pid_t pid;
|
|
|
|
pid = pid_nr_ns(v, inode->i_sb->s_fs_info);
|
|
return seq_printf(seq, "%d ", pid);
|
|
}
|
|
|
|
static void *children_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
return get_children_pid(seq->private, NULL, *pos);
|
|
}
|
|
|
|
static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
struct pid *pid;
|
|
|
|
pid = get_children_pid(seq->private, v, *pos + 1);
|
|
put_pid(v);
|
|
|
|
++*pos;
|
|
return pid;
|
|
}
|
|
|
|
static void children_seq_stop(struct seq_file *seq, void *v)
|
|
{
|
|
put_pid(v);
|
|
}
|
|
|
|
static const struct seq_operations children_seq_ops = {
|
|
.start = children_seq_start,
|
|
.next = children_seq_next,
|
|
.stop = children_seq_stop,
|
|
.show = children_seq_show,
|
|
};
|
|
|
|
static int children_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct seq_file *m;
|
|
int ret;
|
|
|
|
ret = seq_open(file, &children_seq_ops);
|
|
if (ret)
|
|
return ret;
|
|
|
|
m = file->private_data;
|
|
m->private = inode;
|
|
|
|
return ret;
|
|
}
|
|
|
|
int children_seq_release(struct inode *inode, struct file *file)
|
|
{
|
|
seq_release(inode, file);
|
|
return 0;
|
|
}
|
|
|
|
const struct file_operations proc_tid_children_operations = {
|
|
.open = children_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = children_seq_release,
|
|
};
|
|
#endif /* CONFIG_CHECKPOINT_RESTORE */
|