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| author |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-04-26 12:32:50 -0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-04-26 13:15:00 -0300 |
| commit | 2f3027ac28bf6bc3ac7eb851eab06f2a38af5caa (patch) | |
| tree | bc2b421ada54138ea0da15e5c035fb1f82d76487 /tools/perf/util | |
| parent | tools lib api fs: Add helper to read string from procfs file (diff) | |
| download | linux-dev-2f3027ac28bf6bc3ac7eb851eab06f2a38af5caa.tar.xz linux-dev-2f3027ac28bf6bc3ac7eb851eab06f2a38af5caa.zip | |
perf thread: Introduce method to set comm from /proc/pid/self
Will be used for lazy comm loading in 'perf trace'.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Milian Wolff <milian.wolff@kdab.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-7ogbkuoka1y2qsmcckqxvl5m@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to '')
| -rw-r--r-- | tools/perf/util/thread.c | 19 | ||||
| -rw-r--r-- | tools/perf/util/thread.h | 2 |
2 files changed, 21 insertions, 0 deletions
diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c index de2036d1251b..45fcb715a36b 100644 --- a/tools/perf/util/thread.c +++ b/tools/perf/util/thread.c @@ -10,6 +10,8 @@ #include "comm.h" #include "unwind.h" +#include <api/fs/fs.h> + int thread__init_map_groups(struct thread *thread, struct machine *machine) { struct thread *leader; @@ -153,6 +155,23 @@ int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp, return 0; } +int thread__set_comm_from_proc(struct thread *thread) +{ + char path[64]; + char *comm = NULL; + size_t sz; + int err = -1; + + if (!(snprintf(path, sizeof(path), "%d/task/%d/comm", + thread->pid_, thread->tid) >= (int)sizeof(path)) && + procfs__read_str(path, &comm, &sz) == 0) { + comm[sz - 1] = '\0'; + err = thread__set_comm(thread, comm, 0); + } + + return err; +} + const char *thread__comm_str(const struct thread *thread) { const struct comm *comm = thread__comm(thread); diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h index e214207bb13a..45fba13c800b 100644 --- a/tools/perf/util/thread.h +++ b/tools/perf/util/thread.h @@ -71,6 +71,8 @@ static inline int thread__set_comm(struct thread *thread, const char *comm, return __thread__set_comm(thread, comm, timestamp, false); } +int thread__set_comm_from_proc(struct thread *thread); + int thread__comm_len(struct thread *thread); struct comm *thread__comm(const struct thread *thread); struct comm *thread__exec_comm(const struct thread *thread); |