From: "tip-bot2 for Namhyung Kim" <tip-bot2@linutronix.de>
To: linux-tip-commits@vger.kernel.org
Cc: Namhyung Kim <namhyung@kernel.org>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: [tip: perf/core] perf core: Add PERF_COUNT_SW_CGROUP_SWITCHES event
Date: Fri, 16 Apr 2021 15:01:47 -0000 [thread overview]
Message-ID: <161858530783.29796.7669008658355580139.tip-bot2@tip-bot2> (raw)
In-Reply-To: <20210210083327.22726-2-namhyung@kernel.org>
The following commit has been merged into the perf/core branch of tip:
Commit-ID: a389ea9c161d142bf11fd4c553988c2daa9f5404
Gitweb: https://git.kernel.org/tip/a389ea9c161d142bf11fd4c553988c2daa9f5404
Author: Namhyung Kim <namhyung@kernel.org>
AuthorDate: Wed, 10 Feb 2021 17:33:26 +09:00
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Fri, 16 Apr 2021 16:32:43 +02:00
perf core: Add PERF_COUNT_SW_CGROUP_SWITCHES event
This patch adds a new software event to count context switches
involving cgroup switches. So it's counted only if cgroups of
previous and next tasks are different. Note that it only checks the
cgroups in the perf_event subsystem. For cgroup v2, it shouldn't
matter anyway.
One can argue that we can do this by using existing sched_switch event
with eBPF. But some systems might not have eBPF for some reason so
I'd like to add this as a simple way.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20210210083327.22726-2-namhyung@kernel.org
---
include/linux/perf_event.h | 7 +++++++
include/uapi/linux/perf_event.h | 1 +
2 files changed, 8 insertions(+)
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 92d51a7..8989b2b 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1218,6 +1218,13 @@ static inline void perf_event_task_sched_out(struct task_struct *prev,
if (__perf_sw_enabled(PERF_COUNT_SW_CONTEXT_SWITCHES))
__perf_sw_event_sched(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 0);
+#ifdef CONFIG_CGROUP_PERF
+ if (__perf_sw_enabled(PERF_COUNT_SW_CGROUP_SWITCHES) &&
+ perf_cgroup_from_task(prev, NULL) !=
+ perf_cgroup_from_task(next, NULL))
+ __perf_sw_event_sched(PERF_COUNT_SW_CGROUP_SWITCHES, 1, 0);
+#endif
+
if (static_branch_unlikely(&perf_sched_events))
__perf_event_task_sched_out(prev, next);
}
diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index 31b00e3..0b58970 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -112,6 +112,7 @@ enum perf_sw_ids {
PERF_COUNT_SW_EMULATION_FAULTS = 8,
PERF_COUNT_SW_DUMMY = 9,
PERF_COUNT_SW_BPF_OUTPUT = 10,
+ PERF_COUNT_SW_CGROUP_SWITCHES = 11,
PERF_COUNT_SW_MAX, /* non-ABI */
};
next prev parent reply other threads:[~2021-04-16 15:01 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-10 8:33 [PATCH v3 1/3] perf core: Factor out __perf_sw_event_sched Namhyung Kim
2021-02-10 8:33 ` [PATCH v3 2/3] perf core: Add PERF_COUNT_SW_CGROUP_SWITCHES event Namhyung Kim
2021-04-16 15:01 ` tip-bot2 for Namhyung Kim [this message]
2021-04-16 17:13 ` [tip: perf/core] " tip-bot2 for Namhyung Kim
2021-02-10 8:33 ` [PATCH v3 3/3] perf tools: Add 'cgroup-switches' software event Namhyung Kim
2021-04-19 18:02 ` Namhyung Kim
2021-05-06 5:53 ` Namhyung Kim
2021-05-19 17:24 ` Arnaldo Carvalho de Melo
2021-02-25 9:00 ` [PATCH v3 1/3] perf core: Factor out __perf_sw_event_sched Stephane Eranian
2021-04-16 15:01 ` [tip: perf/core] " tip-bot2 for Namhyung Kim
2021-04-16 17:13 ` tip-bot2 for Namhyung Kim
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=161858530783.29796.7669008658355580139.tip-bot2@tip-bot2 \
--to=tip-bot2@linutronix.de \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-tip-commits@vger.kernel.org \
--cc=namhyung@kernel.org \
--cc=peterz@infradead.org \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).