linux-kernel - [PATCH 1/3] perf/core: Pass GFP flags to attach_task_ctx

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Message-ID: <20260211223222.3119790-2-namhyung@kernel.org>
Date: Wed, 11 Feb 2026 14:32:19 -0800
From: Namhyung Kim <namhyung@...nel.org>
To: Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Guenter Roeck <groeck@...gle.com>
Subject: [PATCH 1/3] perf/core: Pass GFP flags to attach_task_ctx_data()

This is a preparation for the next change to reduce the computational
complexity in the global context data handling for LBR callstacks.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 kernel/events/core.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index da013b9a595fcebe..b8498e9891e21c18 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -5370,15 +5370,15 @@ static void unaccount_freq_event(void)
 
 
 static struct perf_ctx_data *
-alloc_perf_ctx_data(struct kmem_cache *ctx_cache, bool global)
+alloc_perf_ctx_data(struct kmem_cache *ctx_cache, bool global, gfp_t gfp_flags)
 {
 	struct perf_ctx_data *cd;
 
-	cd = kzalloc(sizeof(*cd), GFP_KERNEL);
+	cd = kzalloc(sizeof(*cd), gfp_flags);
 	if (!cd)
 		return NULL;
 
-	cd->data = kmem_cache_zalloc(ctx_cache, GFP_KERNEL);
+	cd->data = kmem_cache_zalloc(ctx_cache, gfp_flags);
 	if (!cd->data) {
 		kfree(cd);
 		return NULL;
@@ -5412,11 +5412,11 @@ static inline void perf_free_ctx_data_rcu(struct perf_ctx_data *cd)
 
 static int
 attach_task_ctx_data(struct task_struct *task, struct kmem_cache *ctx_cache,
-		     bool global)
+		     bool global, gfp_t gfp_flags)
 {
 	struct perf_ctx_data *cd, *old = NULL;
 
-	cd = alloc_perf_ctx_data(ctx_cache, global);
+	cd = alloc_perf_ctx_data(ctx_cache, global, gfp_flags);
 	if (!cd)
 		return -ENOMEM;
 
@@ -5499,7 +5499,7 @@ attach_global_ctx_data(struct kmem_cache *ctx_cache)
 
 	return 0;
 alloc:
-	ret = attach_task_ctx_data(p, ctx_cache, true);
+	ret = attach_task_ctx_data(p, ctx_cache, true, GFP_KERNEL);
 	put_task_struct(p);
 	if (ret) {
 		__detach_global_ctx_data();
@@ -5519,7 +5519,7 @@ attach_perf_ctx_data(struct perf_event *event)
 		return -ENOMEM;
 
 	if (task)
-		return attach_task_ctx_data(task, ctx_cache, false);
+		return attach_task_ctx_data(task, ctx_cache, false, GFP_KERNEL);
 
 	ret = attach_global_ctx_data(ctx_cache);
 	if (ret)
@@ -9231,7 +9231,7 @@ perf_event_alloc_task_data(struct task_struct *child,
 
 	return;
 attach:
-	attach_task_ctx_data(child, ctx_cache, true);
+	attach_task_ctx_data(child, ctx_cache, true, GFP_KERNEL);
 }
 
 void perf_event_fork(struct task_struct *task)
-- 
2.53.0.273.g2a3d683680-goog