linux-kernel - [tip:perf/core] perf/core: Add perf_pmu

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Date:   Tue, 16 Apr 2019 04:33:02 -0700
From:   tip-bot for Stephane Eranian <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, tglx@...utronix.de, jolsa@...hat.com,
        vincent.weaver@...ne.edu, eranian@...gle.com, acme@...hat.com,
        hpa@...or.com, mingo@...nel.org, torvalds@...ux-foundation.org,
        alexander.shishkin@...ux.intel.com, peterz@...radead.org
Subject: [tip:perf/core] perf/core: Add perf_pmu_resched() as global
 function

Commit-ID:  c68d224e5ed15605e651e2482c6ffd95915ddf58
Gitweb:     https://git.kernel.org/tip/c68d224e5ed15605e651e2482c6ffd95915ddf58
Author:     Stephane Eranian <eranian@...gle.com>
AuthorDate: Mon, 8 Apr 2019 10:32:51 -0700
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 16 Apr 2019 12:19:34 +0200

perf/core: Add perf_pmu_resched() as global function

This patch add perf_pmu_resched() a global function that can be called
to force rescheduling of events for a given PMU. The function locks
both cpuctx and task_ctx internally. This will be used by a subsequent
patch.

Signed-off-by: Stephane Eranian <eranian@...gle.com>
[ Simplified the calling convention. ]
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Vince Weaver <vincent.weaver@...ne.edu>
Cc: kan.liang@...el.com
Cc: nelson.dsouza@...el.com
Cc: tonyj@...e.com
Link: https://lkml.kernel.org/r/20190408173252.37932-2-eranian@google.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 include/linux/perf_event.h |  3 +++
 kernel/events/core.c       | 10 ++++++++++
 2 files changed, 13 insertions(+)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 085a95e2582a..f3864e1c5569 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -888,6 +888,9 @@ extern void perf_sched_cb_dec(struct pmu *pmu);
 extern void perf_sched_cb_inc(struct pmu *pmu);
 extern int perf_event_task_disable(void);
 extern int perf_event_task_enable(void);
+
+extern void perf_pmu_resched(struct pmu *pmu);
+
 extern int perf_event_refresh(struct perf_event *event, int refresh);
 extern void perf_event_update_userpage(struct perf_event *event);
 extern int perf_event_release_kernel(struct perf_event *event);
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 30a572e4c6f1..abbd4b3b96c2 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -2478,6 +2478,16 @@ static void ctx_resched(struct perf_cpu_context *cpuctx,
 	perf_pmu_enable(cpuctx->ctx.pmu);
 }
 
+void perf_pmu_resched(struct pmu *pmu)
+{
+	struct perf_cpu_context *cpuctx = this_cpu_ptr(pmu->pmu_cpu_context);
+	struct perf_event_context *task_ctx = cpuctx->task_ctx;
+
+	perf_ctx_lock(cpuctx, task_ctx);
+	ctx_resched(cpuctx, task_ctx, EVENT_ALL|EVENT_CPU);
+	perf_ctx_unlock(cpuctx, task_ctx);
+}
+
 /*
  * Cross CPU call to install and enable a performance event
  *