Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1502062 > unrolled thread
| Started by | Vince Weaver <vincent.weaver@maine.edu> |
|---|---|
| First post | 2016-10-17 17:00 +0200 |
| Last post | 2016-10-18 08:20 +0200 |
| Articles | 2 — 2 participants |
Back to article view | Back to linux.kernel
[patch] perf_event_open.2: PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT Vince Weaver <vincent.weaver@maine.edu> - 2016-10-17 17:00 +0200
Re: [patch] perf_event_open.2: PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com> - 2016-10-18 08:20 +0200
| From | Vince Weaver <vincent.weaver@maine.edu> |
|---|---|
| Date | 2016-10-17 17:00 +0200 |
| Subject | [patch] perf_event_open.2: PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT |
| Message-ID | <sthyp-4Nc-17@gated-at.bofh.it> |
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 userspace "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> diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2 index fa8b1bd..59ad289 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
[toc] | [next] | [standalone]
| From | "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com> |
|---|---|
| Date | 2016-10-18 08:20 +0200 |
| Subject | Re: [patch] perf_event_open.2: PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT |
| Message-ID | <stvUJ-6oR-11@gated-at.bofh.it> |
| In reply to | #1502062 |
Hi Vince, On 10/17/2016 04:50 PM, Vince Weaver wrote: > > 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 userspace "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> Thanks. Applied! Cheers, Michael > diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2 > index fa8b1bd..59ad289 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 > -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/
[toc] | [prev] | [standalone]
Back to top | Article view | linux.kernel
csiph-web