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| author | Kan Liang <kan.liang@intel.com> | 2015-06-17 09:51:10 -0400 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-06-19 18:20:15 -0300 |
| commit | 930e6fcd2bcce9bcd9d4aa7e755678d33f3fe6f4 (patch) | |
| tree | 5f85d268437a01f2a2982be31c82cb00a81efd85 /include/uapi/linux/perf_event.h | |
| parent | c05676c06232e6459a6106ddf0d4e154ce6cd859 (diff) | |
| download | linux-930e6fcd2bcce9bcd9d4aa7e755678d33f3fe6f4.tar.gz linux-930e6fcd2bcce9bcd9d4aa7e755678d33f3fe6f4.tar.bz2 linux-930e6fcd2bcce9bcd9d4aa7e755678d33f3fe6f4.zip | |
perf tools: Add time out to force stop proc map processing
System wide sampling like 'perf top' or 'perf record -a' read all
threads /proc/xxx/maps before sampling. If there are any threads which
generating a keeping growing huge maps, perf will do infinite loop
during synthesizing. Nothing will be sampled.
This patch fixes this issue by adding per-thread timeout to force stop
this kind of endless proc map processing.
PERF_RECORD_MISC_PROC_MAP_PARSE_TIME_OUT is introduced to indicate that
the mmap record are truncated by time out. User will get warning
notification when truncated mmap records are detected.
Reported-by: Ying Huang <ying.huang@intel.com>
Signed-off-by: Kan Liang <kan.liang@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ying Huang <ying.huang@intel.com>
Link: http://lkml.kernel.org/r/1434549071-25611-1-git-send-email-kan.liang@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'include/uapi/linux/perf_event.h')
| -rw-r--r-- | include/uapi/linux/perf_event.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h index 613ed9ad588f..d97f84c080da 100644 --- a/include/uapi/linux/perf_event.h +++ b/include/uapi/linux/perf_event.h @@ -566,6 +566,10 @@ struct perf_event_mmap_page { #define PERF_RECORD_MISC_GUEST_USER (5 << 0) /* + * Indicates that /proc/PID/maps parsing are truncated by time out. + */ +#define PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT (1 << 12) +/* * PERF_RECORD_MISC_MMAP_DATA and PERF_RECORD_MISC_COMM_EXEC are used on * different events so can reuse the same bit position. */ |