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| author | Vince Weaver <vincent.weaver@maine.edu> | 2016-10-17 10:50:40 -0400 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2016-10-18 08:15:30 +0200 |
| commit | ffbc7c027313f0c5572c1d94399445cf44036e12 (patch) | |
| tree | 73c505733f599233a964a84a8a1bf301335088ae | |
| parent | 2046b8ac01beb4732191b1d17660b7951f78e3a5 (diff) | |
| download | man-pages-ffbc7c027313f0c5572c1d94399445cf44036e12.tar.gz | |
perf_event_open.2: Document PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT
Linux 4.2 reserved a new bit from the misc field in
the perf_event_open() mmap sample buffer:
PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT
Despite being reserved in the public
include/uapi/linux/perf_event.h header file, this bit is never set
by the kernel. Rather, it is used internally by the user-space
"perf" utility to indicate that, when attempting to parse all of
the /proc/xxx/maps files for the sample, it ended up taking too
long so the scan was aborted.
Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
| -rw-r--r-- | man2/perf_event_open.2 | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2 index fa8b1bd379..59ad28959e 100644 --- a/man2/perf_event_open.2 +++ b/man2/perf_event_open.2 @@ -1822,6 +1822,14 @@ See also .BR PERF_RECORD_MISC_EXT_RESERVED " (since Linux 2.6.35)" .\" commit 1676b8a077c352085d52578fb4f29350b58b6e74 This indicates there is extended data available (currently not used). +.TP +.B PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT +.\" commit 930e6fcd2bcce9bcd9d4aa7e755678d33f3fe6f4 +This bit is not set by the kernel. +It is reserved for the userspace perf utility to indicate that +.I /proc/xxx/maps +parsing was taking too long and stopped and thus the mmap +records may be truncated. .RE .TP .I type |