Commit-ID: a59e64a13a927fb7530bef39e9f5e7de8268137e Gitweb: http://git.kernel.org/tip/a59e64a13a927fb7530bef39e9f5e7de8268137e Author: Namhyung Kim <namhyung.kim@xxxxxxx> AuthorDate: Thu, 31 May 2012 14:51:45 +0900 Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> CommitDate: Thu, 31 May 2012 11:38:42 -0300 perf tools: Update ioctl documentation for PERF_IOC_FLAG_GROUP The ioctl interface of perf event fd receives 3 arguments to control event group behavior but it lacked documentation. Signed-off-by: Namhyung Kim <namhyung.kim@xxxxxxx> Cc: Namhyung Kim <namhyung@xxxxxxxxx> Cc: Paul Mackerras <paulus@xxxxxxxxx> Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> Link: http://lkml.kernel.org/r/1338443506-25009-2-git-send-email-namhyung.kim@xxxxxxx Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> --- tools/perf/design.txt | 7 ++++--- 1 files changed, 4 insertions(+), 3 deletions(-) diff --git a/tools/perf/design.txt b/tools/perf/design.txt index bd0bb1b..67e5d0c 100644 --- a/tools/perf/design.txt +++ b/tools/perf/design.txt @@ -409,14 +409,15 @@ Counters can be enabled and disabled in two ways: via ioctl and via prctl. When a counter is disabled, it doesn't count or generate events but does continue to exist and maintain its count value. -An individual counter or counter group can be enabled with +An individual counter can be enabled with - ioctl(fd, PERF_EVENT_IOC_ENABLE); + ioctl(fd, PERF_EVENT_IOC_ENABLE, 0); or disabled with - ioctl(fd, PERF_EVENT_IOC_DISABLE); + ioctl(fd, PERF_EVENT_IOC_DISABLE, 0); +For a counter group, pass PERF_IOC_FLAG_GROUP as the third argument. Enabling or disabling the leader of a group enables or disables the whole group; that is, while the group leader is disabled, none of the counters in the group will count. Enabling or disabling a member of a -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
|