#include "util.h" #include "../perf.h" #include #include "evsel.h" #include "cgroup.h" #include "evlist.h" int nr_cgroups; static int cgroupfs_find_mountpoint(char *buf, size_t maxlen) { FILE *fp; char mountpoint[PATH_MAX + 1], tokens[PATH_MAX + 1], type[PATH_MAX + 1]; char *token, *saved_ptr = NULL; int found = 0; fp = fopen("/proc/mounts", "r"); if (!fp) return -1; /* * in order to handle split hierarchy, we need to scan /proc/mounts * and inspect every cgroupfs mount point to find one that has * perf_event subsystem */ while (fscanf(fp, "%*s %"STR(PATH_MAX)"s %"STR(PATH_MAX)"s %" STR(PATH_MAX)"s %*d %*d\n", mountpoint, type, tokens) == 3) { if (!strcmp(type, "cgroup")) { token = strtok_r(tokens, ",", &saved_ptr); while (token != NULL) { if (!strcmp(token, "perf_event")) { found = 1; break; } token = strtok_r(NULL, ",", &saved_ptr); } } if (found) break; } fclose(fp); if (!found) return -1; if (strlen(mountpoint) < maxlen) { strcpy(buf, mountpoint); return 0; } return -1; } static int open_cgroup(char *name) { char path[PATH_MAX + 1]; char mnt[PATH_MAX + 1]; int fd; if (cgroupfs_find_mountpoint(mnt, PATH_MAX + 1)) return -1; snprintf(path, PATH_MAX, "%s/%s", mnt, name); fd = open(path, O_RDONLY); if (fd == -1) fprintf(stderr, "no access to cgroup %s\n", path); return fd; } static int add_cgroup(struct perf_evlist *evlist, char *str) { struct perf_evsel *counter; struct cgroup_sel *cgrp = NULL; int n; /* * check if cgrp is already defined, if so we reuse it */ evlist__for_each_entry(evlist, counter) { cgrp = counter->cgrp; if (!cgrp) continue; if (!strcmp(cgrp->name, str)) break; cgrp = NULL; } if (!cgrp) { cgrp = zalloc(sizeof(*cgrp)); if (!cgrp) return -1; cgrp->name = str; cgrp->fd = open_cgroup(str); if (cgrp->fd == -1) { free(cgrp); return -1; } } /* * find corresponding event * if add cgroup N, then need to find event N */ n = 0; evlist__for_each_entry(evlist, counter) { if (n == nr_cgroups) goto found; n++; } if (atomic_read(&cgrp->refcnt) == 0) free(cgrp); return -1; found: atomic_inc(&cgrp->refcnt); counter->cgrp = cgrp; return 0; } void close_cgroup(struct cgroup_sel *cgrp) { if (cgrp && atomic_dec_and_test(&cgrp->refcnt)) { close(cgrp->fd); zfree(&cgrp->name); free(cgrp); } } int parse_cgroups(const struct option *opt __maybe_unused, const char *str, int unset __maybe_unused) { struct perf_evlist *evlist = *(struct perf_evlist **)opt->value; const char *p, *e, *eos = str + strlen(str); char *s; int ret; if (list_empty(&evlist->entries)) { fprintf(stderr, "must define events before cgroups\n"); return -1; } for (;;) { p = strchr(str, ','); e = p ? p : eos; /* allow empty cgroups, i.e., skip */ if (e - str) { /* termination added */ s = strndup(str, e - str); if (!s) return -1; ret = add_cgroup(evlist, s); if (ret) { free(s); return -1; } } /* nr_cgroups is increased een for empty cgroups */ nr_cgroups++; if (!p) break; str = p+1; } return 0; } on>space:mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2016-12-12 21:58:13 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-12 21:58:13 -0800
commite7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba (patch)
treef63906f41699c8e38af9d12b063e2ceab0286ef2 /fs/xfs/libxfs/xfs_inode_fork.h
parente34bac726d27056081d0250c0e173e4b155aa340 (diff)
parent868c97a846a73e937d835b09b8c885a69df50ec8 (diff)
Merge tag 'docs-4.10' of git://git.lwn.net/linuxHEADmaster
Pull documentation update from Jonathan Corbet: "These are the documentation changes for 4.10. It's another busy cycle for the docs tree, as the sphinx conversion continues. Highlights include: - Further work on PDF output, which remains a bit of a pain but should be more solid now. - Five more DocBook template files converted to Sphinx. Only 27 to go... Lots of plain-text files have also been converted and integrated. - Images in binary formats have been replaced with more source-friendly versions. - Various bits of organizational work, including the renaming of various files discussed at the kernel summit. - New documentation for the device_link mechanism. ... and, of course, lots of typo fixes and small updates" * tag 'docs-4.10' of git://git.lwn.net/linux: (193 commits) dma-buf: Extract dma-buf.rst Update Documentation/00-INDEX docs: 00-INDEX: document directories/files with no docs docs: 00-INDEX: remove non-existing entries docs: 00-INDEX: add missing entries for documentation files/dirs docs: 00-INDEX: consolidate process/ and admin-guide/ description scripts: add a script to check if Documentation/00-INDEX is sane Docs: change sh -> awk in REPORTING-BUGS Documentation/core-api/device_link: Add initial documentation core-api: remove an unexpected unident ppc/idle: Add documentation for powersave=off Doc: Correct typo, "Introdution" => "Introduction" Documentation/atomic_ops.txt: convert to ReST markup Documentation/local_ops.txt: convert to ReST markup Documentation/assoc_array.txt: convert to ReST markup docs-rst: parse-headers.pl: cleanup the documentation docs-rst: fix media cleandocs target docs-rst: media/Makefile: reorganize the rules docs-rst: media: build SVG from graphviz files docs-rst: replace bayer.png by a SVG image ...
Diffstat (limited to 'fs/xfs/libxfs/xfs_inode_fork.h')