linux-kernel - [PATCH 2/5] perf: Extract a few helpers

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Message-Id: <20240807115550.031212518@infradead.org>
Date: Wed, 07 Aug 2024 13:29:26 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: mingo@...nel.org
Cc: peterz@...radead.org,
 acme@...nel.org,
 namhyung@...nel.org,
 mark.rutland@....com,
 alexander.shishkin@...ux.intel.com,
 jolsa@...nel.org,
 irogers@...gle.com,
 adrian.hunter@...el.com,
 kan.liang@...ux.intel.com,
 linux-perf-users@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: [PATCH 2/5] perf: Extract a few helpers

The context time update code is repeated verbatim a few times.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 kernel/events/core.c |   39 ++++++++++++++++++++++-----------------
 1 file changed, 22 insertions(+), 17 deletions(-)

--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -2330,6 +2330,24 @@ group_sched_out(struct perf_event *group
 		event_sched_out(event, ctx);
 }
 
+static inline void
+ctx_time_update(struct perf_cpu_context *cpuctx, struct perf_event_context *ctx)
+{
+	if (ctx->is_active & EVENT_TIME) {
+		update_context_time(ctx);
+		update_cgrp_time_from_cpuctx(cpuctx, false);
+	}
+}
+
+static inline void
+ctx_time_update_event(struct perf_event_context *ctx, struct perf_event *event)
+{
+	if (ctx->is_active & EVENT_TIME) {
+		update_context_time(ctx);
+		update_cgrp_time_from_event(event);
+	}
+}
+
 #define DETACH_GROUP	0x01UL
 #define DETACH_CHILD	0x02UL
 #define DETACH_DEAD	0x04UL
@@ -2349,10 +2367,7 @@ __perf_remove_from_context(struct perf_e
 	struct perf_event_pmu_context *pmu_ctx = event->pmu_ctx;
 	unsigned long flags = (unsigned long)info;
 
-	if (ctx->is_active & EVENT_TIME) {
-		update_context_time(ctx);
-		update_cgrp_time_from_cpuctx(cpuctx, false);
-	}
+	ctx_time_update(cpuctx, ctx);
 
 	/*
 	 * Ensure event_sched_out() switches to OFF, at the very least
@@ -2437,12 +2452,8 @@ static void __perf_event_disable(struct
 	if (event->state < PERF_EVENT_STATE_INACTIVE)
 		return;
 
-	if (ctx->is_active & EVENT_TIME) {
-		update_context_time(ctx);
-		update_cgrp_time_from_event(event);
-	}
-
 	perf_pmu_disable(event->pmu_ctx->pmu);
+	ctx_time_update_event(ctx, event);
 
 	if (event == event->group_leader)
 		group_sched_out(event, ctx);
@@ -4529,10 +4540,7 @@ static void __perf_event_read(void *info
 		return;
 
 	raw_spin_lock(&ctx->lock);
-	if (ctx->is_active & EVENT_TIME) {
-		update_context_time(ctx);
-		update_cgrp_time_from_event(event);
-	}
+	ctx_time_update_event(ctx, event);
 
 	perf_event_update_time(event);
 	if (data->group)
@@ -4732,10 +4740,7 @@ static int perf_event_read(struct perf_e
 		 * May read while context is not active (e.g., thread is
 		 * blocked), in that case we cannot update context time
 		 */
-		if (ctx->is_active & EVENT_TIME) {
-			update_context_time(ctx);
-			update_cgrp_time_from_event(event);
-		}
+		ctx_time_update_event(ctx, event);
 
 		perf_event_update_time(event);
 		if (group)