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![Ian Rogers](/assets/img/avatar_default.png)
Metrics are their own unit and these variables held broken metrics previously and now just hold the value NULL. Remove code that used these variables. Reviewed-by: John Garry <john.g.garry@oracle.com> Reviewed-by: Kajol Jain <kjain@linux.ibm.com> Signed-off-by: Ian Rogers <irogers@google.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Caleb Biggers <caleb.biggers@intel.com> Cc: Florian Fischer <florian.fischer@muhq.space> Cc: Ian Rogers <irogers@google.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Clark <james.clark@arm.com> Cc: Jing Zhang <renyu.zj@linux.alibaba.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Kang Minchul <tegongkang@gmail.com> Cc: Kim Phillips <kim.phillips@amd.com> Cc: Leo Yan <leo.yan@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mike Leach <mike.leach@linaro.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Perry Taylor <perry.taylor@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Bangoria <ravi.bangoria@amd.com> Cc: Rob Herring <robh@kernel.org> Cc: Sandipan Das <sandipan.das@amd.com> Cc: Stephane Eranian <eranian@google.com> Cc: Will Deacon <will@kernel.org> Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com> Cc: linux-arm-kernel@lists.infradead.org Cc: linuxppc-dev@lists.ozlabs.org Link: https://lore.kernel.org/r/20230126233645.200509-8-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
589 lines
12 KiB
C
589 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <subcmd/parse-options.h>
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#include "evsel.h"
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#include "cgroup.h"
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#include "evlist.h"
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#include "rblist.h"
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#include "metricgroup.h"
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#include "stat.h"
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#include <linux/zalloc.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/statfs.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <api/fs/fs.h>
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#include <ftw.h>
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#include <regex.h>
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int nr_cgroups;
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bool cgrp_event_expanded;
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/* used to match cgroup name with patterns */
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struct cgroup_name {
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struct list_head list;
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bool used;
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char name[];
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};
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static LIST_HEAD(cgroup_list);
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static int open_cgroup(const char *name)
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{
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char path[PATH_MAX + 1];
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char mnt[PATH_MAX + 1];
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int fd;
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if (cgroupfs_find_mountpoint(mnt, PATH_MAX + 1, "perf_event"))
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return -1;
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scnprintf(path, PATH_MAX, "%s/%s", mnt, name);
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fd = open(path, O_RDONLY);
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if (fd == -1)
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fprintf(stderr, "no access to cgroup %s\n", path);
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return fd;
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}
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#ifdef HAVE_FILE_HANDLE
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int read_cgroup_id(struct cgroup *cgrp)
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{
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char path[PATH_MAX + 1];
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char mnt[PATH_MAX + 1];
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struct {
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struct file_handle fh;
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uint64_t cgroup_id;
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} handle;
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int mount_id;
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if (cgroupfs_find_mountpoint(mnt, PATH_MAX + 1, "perf_event"))
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return -1;
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scnprintf(path, PATH_MAX, "%s/%s", mnt, cgrp->name);
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handle.fh.handle_bytes = sizeof(handle.cgroup_id);
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if (name_to_handle_at(AT_FDCWD, path, &handle.fh, &mount_id, 0) < 0)
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return -1;
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cgrp->id = handle.cgroup_id;
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return 0;
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}
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#endif /* HAVE_FILE_HANDLE */
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#ifndef CGROUP2_SUPER_MAGIC
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#define CGROUP2_SUPER_MAGIC 0x63677270
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#endif
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int cgroup_is_v2(const char *subsys)
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{
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char mnt[PATH_MAX + 1];
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struct statfs stbuf;
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if (cgroupfs_find_mountpoint(mnt, PATH_MAX + 1, subsys))
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return -1;
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if (statfs(mnt, &stbuf) < 0)
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return -1;
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return (stbuf.f_type == CGROUP2_SUPER_MAGIC);
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}
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static struct cgroup *evlist__find_cgroup(struct evlist *evlist, const char *str)
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{
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struct evsel *counter;
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/*
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* check if cgrp is already defined, if so we reuse it
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*/
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evlist__for_each_entry(evlist, counter) {
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if (!counter->cgrp)
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continue;
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if (!strcmp(counter->cgrp->name, str))
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return cgroup__get(counter->cgrp);
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}
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return NULL;
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}
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static struct cgroup *cgroup__new(const char *name, bool do_open)
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{
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struct cgroup *cgroup = zalloc(sizeof(*cgroup));
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if (cgroup != NULL) {
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refcount_set(&cgroup->refcnt, 1);
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cgroup->name = strdup(name);
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if (!cgroup->name)
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goto out_err;
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if (do_open) {
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cgroup->fd = open_cgroup(name);
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if (cgroup->fd == -1)
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goto out_free_name;
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} else {
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cgroup->fd = -1;
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}
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}
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return cgroup;
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out_free_name:
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zfree(&cgroup->name);
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out_err:
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free(cgroup);
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return NULL;
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}
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struct cgroup *evlist__findnew_cgroup(struct evlist *evlist, const char *name)
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{
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struct cgroup *cgroup = evlist__find_cgroup(evlist, name);
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return cgroup ?: cgroup__new(name, true);
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}
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static int add_cgroup(struct evlist *evlist, const char *str)
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{
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struct evsel *counter;
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struct cgroup *cgrp = evlist__findnew_cgroup(evlist, str);
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int n;
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if (!cgrp)
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return -1;
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/*
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* find corresponding event
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* if add cgroup N, then need to find event N
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*/
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n = 0;
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evlist__for_each_entry(evlist, counter) {
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if (n == nr_cgroups)
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goto found;
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n++;
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}
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cgroup__put(cgrp);
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return -1;
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found:
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counter->cgrp = cgrp;
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return 0;
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}
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static void cgroup__delete(struct cgroup *cgroup)
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{
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if (cgroup->fd >= 0)
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close(cgroup->fd);
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zfree(&cgroup->name);
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free(cgroup);
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}
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void cgroup__put(struct cgroup *cgrp)
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{
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if (cgrp && refcount_dec_and_test(&cgrp->refcnt)) {
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cgroup__delete(cgrp);
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}
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}
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struct cgroup *cgroup__get(struct cgroup *cgroup)
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{
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if (cgroup)
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refcount_inc(&cgroup->refcnt);
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return cgroup;
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}
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static void evsel__set_default_cgroup(struct evsel *evsel, struct cgroup *cgroup)
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{
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if (evsel->cgrp == NULL)
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evsel->cgrp = cgroup__get(cgroup);
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}
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void evlist__set_default_cgroup(struct evlist *evlist, struct cgroup *cgroup)
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{
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struct evsel *evsel;
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evlist__for_each_entry(evlist, evsel)
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evsel__set_default_cgroup(evsel, cgroup);
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}
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/* helper function for ftw() in match_cgroups and list_cgroups */
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static int add_cgroup_name(const char *fpath, const struct stat *sb __maybe_unused,
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int typeflag, struct FTW *ftwbuf __maybe_unused)
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{
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struct cgroup_name *cn;
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if (typeflag != FTW_D)
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return 0;
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cn = malloc(sizeof(*cn) + strlen(fpath) + 1);
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if (cn == NULL)
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return -1;
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cn->used = false;
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strcpy(cn->name, fpath);
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list_add_tail(&cn->list, &cgroup_list);
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return 0;
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}
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static int check_and_add_cgroup_name(const char *fpath)
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{
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struct cgroup_name *cn;
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list_for_each_entry(cn, &cgroup_list, list) {
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if (!strcmp(cn->name, fpath))
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return 0;
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}
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/* pretend if it's added by ftw() */
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return add_cgroup_name(fpath, NULL, FTW_D, NULL);
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}
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static void release_cgroup_list(void)
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{
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struct cgroup_name *cn;
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while (!list_empty(&cgroup_list)) {
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cn = list_first_entry(&cgroup_list, struct cgroup_name, list);
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list_del(&cn->list);
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free(cn);
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}
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}
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/* collect given cgroups only */
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static int list_cgroups(const char *str)
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{
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const char *p, *e, *eos = str + strlen(str);
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struct cgroup_name *cn;
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char *s;
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/* use given name as is when no regex is given */
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for (;;) {
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p = strchr(str, ',');
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e = p ? p : eos;
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if (e - str) {
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int ret;
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s = strndup(str, e - str);
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if (!s)
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return -1;
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ret = check_and_add_cgroup_name(s);
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free(s);
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if (ret < 0)
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return -1;
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} else {
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if (check_and_add_cgroup_name("/") < 0)
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return -1;
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}
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if (!p)
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break;
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str = p+1;
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}
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/* these groups will be used */
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list_for_each_entry(cn, &cgroup_list, list)
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cn->used = true;
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return 0;
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}
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/* collect all cgroups first and then match with the pattern */
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static int match_cgroups(const char *str)
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{
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char mnt[PATH_MAX];
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const char *p, *e, *eos = str + strlen(str);
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struct cgroup_name *cn;
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regex_t reg;
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int prefix_len;
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char *s;
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if (cgroupfs_find_mountpoint(mnt, sizeof(mnt), "perf_event"))
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return -1;
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/* cgroup_name will have a full path, skip the root directory */
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prefix_len = strlen(mnt);
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/* collect all cgroups in the cgroup_list */
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if (nftw(mnt, add_cgroup_name, 20, 0) < 0)
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return -1;
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for (;;) {
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p = strchr(str, ',');
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e = p ? p : eos;
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/* allow empty cgroups, i.e., skip */
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if (e - str) {
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/* termination added */
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s = strndup(str, e - str);
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if (!s)
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return -1;
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if (regcomp(®, s, REG_NOSUB)) {
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free(s);
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return -1;
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}
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/* check cgroup name with the pattern */
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list_for_each_entry(cn, &cgroup_list, list) {
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char *name = cn->name + prefix_len;
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if (name[0] == '/' && name[1])
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name++;
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if (!regexec(®, name, 0, NULL, 0))
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cn->used = true;
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}
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regfree(®);
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free(s);
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} else {
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/* first entry to root cgroup */
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cn = list_first_entry(&cgroup_list, struct cgroup_name,
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list);
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cn->used = true;
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}
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if (!p)
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break;
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str = p+1;
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}
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return prefix_len;
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}
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int parse_cgroups(const struct option *opt, const char *str,
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int unset __maybe_unused)
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{
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struct evlist *evlist = *(struct evlist **)opt->value;
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struct evsel *counter;
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struct cgroup *cgrp = NULL;
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const char *p, *e, *eos = str + strlen(str);
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char *s;
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int ret, i;
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if (list_empty(&evlist->core.entries)) {
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fprintf(stderr, "must define events before cgroups\n");
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return -1;
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}
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for (;;) {
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p = strchr(str, ',');
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e = p ? p : eos;
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/* allow empty cgroups, i.e., skip */
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if (e - str) {
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/* termination added */
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s = strndup(str, e - str);
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if (!s)
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return -1;
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ret = add_cgroup(evlist, s);
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free(s);
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if (ret)
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return -1;
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}
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/* nr_cgroups is increased een for empty cgroups */
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nr_cgroups++;
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if (!p)
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break;
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str = p+1;
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}
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/* for the case one cgroup combine to multiple events */
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i = 0;
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if (nr_cgroups == 1) {
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evlist__for_each_entry(evlist, counter) {
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if (i == 0)
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cgrp = counter->cgrp;
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else {
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counter->cgrp = cgrp;
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refcount_inc(&cgrp->refcnt);
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}
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i++;
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}
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}
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return 0;
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}
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static bool has_pattern_string(const char *str)
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{
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return !!strpbrk(str, "{}[]()|*+?^$");
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}
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int evlist__expand_cgroup(struct evlist *evlist, const char *str,
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struct rblist *metric_events, bool open_cgroup)
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{
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struct evlist *orig_list, *tmp_list;
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struct evsel *pos, *evsel, *leader;
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struct rblist orig_metric_events;
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struct cgroup *cgrp = NULL;
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struct cgroup_name *cn;
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int ret = -1;
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int prefix_len;
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if (evlist->core.nr_entries == 0) {
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fprintf(stderr, "must define events before cgroups\n");
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return -EINVAL;
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}
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orig_list = evlist__new();
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tmp_list = evlist__new();
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if (orig_list == NULL || tmp_list == NULL) {
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fprintf(stderr, "memory allocation failed\n");
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return -ENOMEM;
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}
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/* save original events and init evlist */
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evlist__splice_list_tail(orig_list, &evlist->core.entries);
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evlist->core.nr_entries = 0;
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if (metric_events) {
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orig_metric_events = *metric_events;
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rblist__init(metric_events);
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} else {
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rblist__init(&orig_metric_events);
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}
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if (has_pattern_string(str))
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prefix_len = match_cgroups(str);
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else
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prefix_len = list_cgroups(str);
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if (prefix_len < 0)
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goto out_err;
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list_for_each_entry(cn, &cgroup_list, list) {
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char *name;
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if (!cn->used)
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continue;
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/* cgroup_name might have a full path, skip the prefix */
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name = cn->name + prefix_len;
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if (name[0] == '/' && name[1])
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name++;
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cgrp = cgroup__new(name, open_cgroup);
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if (cgrp == NULL)
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goto out_err;
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leader = NULL;
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evlist__for_each_entry(orig_list, pos) {
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evsel = evsel__clone(pos);
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if (evsel == NULL)
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goto out_err;
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cgroup__put(evsel->cgrp);
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evsel->cgrp = cgroup__get(cgrp);
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if (evsel__is_group_leader(pos))
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leader = evsel;
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evsel__set_leader(evsel, leader);
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evlist__add(tmp_list, evsel);
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}
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/* cgroup__new() has a refcount, release it here */
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cgroup__put(cgrp);
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nr_cgroups++;
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if (metric_events) {
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if (metricgroup__copy_metric_events(tmp_list, cgrp,
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metric_events,
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&orig_metric_events) < 0)
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goto out_err;
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}
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evlist__splice_list_tail(evlist, &tmp_list->core.entries);
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tmp_list->core.nr_entries = 0;
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}
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if (list_empty(&evlist->core.entries)) {
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fprintf(stderr, "no cgroup matched: %s\n", str);
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goto out_err;
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}
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ret = 0;
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cgrp_event_expanded = true;
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out_err:
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evlist__delete(orig_list);
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evlist__delete(tmp_list);
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rblist__exit(&orig_metric_events);
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release_cgroup_list();
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return ret;
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}
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static struct cgroup *__cgroup__findnew(struct rb_root *root, uint64_t id,
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bool create, const char *path)
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{
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struct rb_node **p = &root->rb_node;
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struct rb_node *parent = NULL;
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struct cgroup *cgrp;
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while (*p != NULL) {
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parent = *p;
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cgrp = rb_entry(parent, struct cgroup, node);
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|
|
if (cgrp->id == id)
|
|
return cgrp;
|
|
|
|
if (cgrp->id < id)
|
|
p = &(*p)->rb_left;
|
|
else
|
|
p = &(*p)->rb_right;
|
|
}
|
|
|
|
if (!create)
|
|
return NULL;
|
|
|
|
cgrp = malloc(sizeof(*cgrp));
|
|
if (cgrp == NULL)
|
|
return NULL;
|
|
|
|
cgrp->name = strdup(path);
|
|
if (cgrp->name == NULL) {
|
|
free(cgrp);
|
|
return NULL;
|
|
}
|
|
|
|
cgrp->fd = -1;
|
|
cgrp->id = id;
|
|
refcount_set(&cgrp->refcnt, 1);
|
|
|
|
rb_link_node(&cgrp->node, parent, p);
|
|
rb_insert_color(&cgrp->node, root);
|
|
|
|
return cgrp;
|
|
}
|
|
|
|
struct cgroup *cgroup__findnew(struct perf_env *env, uint64_t id,
|
|
const char *path)
|
|
{
|
|
struct cgroup *cgrp;
|
|
|
|
down_write(&env->cgroups.lock);
|
|
cgrp = __cgroup__findnew(&env->cgroups.tree, id, true, path);
|
|
up_write(&env->cgroups.lock);
|
|
return cgrp;
|
|
}
|
|
|
|
struct cgroup *cgroup__find(struct perf_env *env, uint64_t id)
|
|
{
|
|
struct cgroup *cgrp;
|
|
|
|
down_read(&env->cgroups.lock);
|
|
cgrp = __cgroup__findnew(&env->cgroups.tree, id, false, NULL);
|
|
up_read(&env->cgroups.lock);
|
|
return cgrp;
|
|
}
|
|
|
|
void perf_env__purge_cgroups(struct perf_env *env)
|
|
{
|
|
struct rb_node *node;
|
|
struct cgroup *cgrp;
|
|
|
|
down_write(&env->cgroups.lock);
|
|
while (!RB_EMPTY_ROOT(&env->cgroups.tree)) {
|
|
node = rb_first(&env->cgroups.tree);
|
|
cgrp = rb_entry(node, struct cgroup, node);
|
|
|
|
rb_erase(node, &env->cgroups.tree);
|
|
cgroup__put(cgrp);
|
|
}
|
|
up_write(&env->cgroups.lock);
|
|
}
|