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Mon, 12 Jun 2023 11:38:53 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 0) id 2806930A79085; Mon, 12 Jun 2023 11:38:49 +0200 (CEST) Message-ID: <20230612093541.311174114@infradead.org> User-Agent: quilt/0.66 Date: Mon, 12 Jun 2023 11:08:05 +0200 From: Peter Zijlstra To: torvalds@linux-foundation.org, keescook@chromium.org, gregkh@linuxfoundation.org, pbonzini@redhat.com Cc: masahiroy@kernel.org, nathan@kernel.org, ndesaulniers@google.com, nicolas@fjasle.eu, catalin.marinas@arm.com, will@kernel.org, vkoul@kernel.org, trix@redhat.com, ojeda@kernel.org, peterz@infradead.org, mingo@redhat.com, longman@redhat.com, boqun.feng@gmail.com, dennis@kernel.org, tj@kernel.org, cl@linux.com, acme@kernel.org, mark.rutland@arm.com, alexander.shishkin@linux.intel.com, jolsa@kernel.org, namhyung@kernel.org, irogers@google.com, adrian.hunter@intel.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, paulmck@kernel.org, frederic@kernel.org, quic_neeraju@quicinc.com, joel@joelfernandes.org, josh@joshtriplett.org, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com, rientjes@google.com, vbabka@suse.cz, roman.gushchin@linux.dev, 42.hyeyoo@gmail.com, apw@canonical.com, joe@perches.com, dwaipayanray1@gmail.com, lukas.bulwahn@gmail.com, john.johansen@canonical.com, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org, llvm@lists.linux.dev, linux-perf-users@vger.kernel.org, rcu@vger.kernel.org, linux-security-module@vger.kernel.org, tglx@linutronix.de, ravi.bangoria@amd.com, error27@gmail.com, luc.vanoostenryck@gmail.com Subject: [PATCH v3 52/57] perf: Simplify perf_event_init_context() References: <20230612090713.652690195@infradead.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org Signed-off-by: Peter Zijlstra (Intel) --- kernel/events/core.c | 29 +++++++++++------------------ 1 file changed, 11 insertions(+), 18 deletions(-) --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -1450,6 +1450,10 @@ static void perf_unpin_context(struct pe raw_spin_unlock_irqrestore(&ctx->lock, flags); } +DEFINE_CLASS(pin_task_ctx, struct perf_event_context *, + if (_T) { perf_unpin_context(_T); put_ctx(_T); }, + perf_pin_task_context(task), struct task_struct *task) + /* * Update the record of the current time in a context. */ @@ -7939,18 +7943,13 @@ static void perf_event_addr_filters_exec void perf_event_exec(void) { - struct perf_event_context *ctx; - - ctx = perf_pin_task_context(current); + CLASS(pin_task_ctx, ctx)(current); if (!ctx) return; perf_event_enable_on_exec(ctx); perf_event_remove_on_exec(ctx); perf_iterate_ctx(ctx, perf_event_addr_filters_exec, NULL, true); - - perf_unpin_context(ctx); - put_ctx(ctx); } struct remote_output { @@ -13226,8 +13225,7 @@ inherit_task_group(struct perf_event *ev */ static int perf_event_init_context(struct task_struct *child, u64 clone_flags) { - struct perf_event_context *child_ctx, *parent_ctx; - struct perf_event_context *cloned_ctx; + struct perf_event_context *child_ctx, *cloned_ctx; struct perf_event *event; struct task_struct *parent = current; int inherited_all = 1; @@ -13241,7 +13239,7 @@ static int perf_event_init_context(struc * If the parent's context is a clone, pin it so it won't get * swapped under us. */ - parent_ctx = perf_pin_task_context(parent); + CLASS(pin_task_ctx, parent_ctx)(parent); if (!parent_ctx) return 0; @@ -13256,7 +13254,7 @@ static int perf_event_init_context(struc * Lock the parent list. No need to lock the child - not PID * hashed yet and not running, so nobody can access it. */ - mutex_lock(&parent_ctx->mutex); + guard(mutex)(&parent_ctx->mutex); /* * We dont have to disable NMIs - we are only looking at @@ -13266,7 +13264,7 @@ static int perf_event_init_context(struc ret = inherit_task_group(event, parent, parent_ctx, child, clone_flags, &inherited_all); if (ret) - goto out_unlock; + return ret; } /* @@ -13282,7 +13280,7 @@ static int perf_event_init_context(struc ret = inherit_task_group(event, parent, parent_ctx, child, clone_flags, &inherited_all); if (ret) - goto out_unlock; + return ret; } raw_spin_lock_irqsave(&parent_ctx->lock, flags); @@ -13310,13 +13308,8 @@ static int perf_event_init_context(struc } raw_spin_unlock_irqrestore(&parent_ctx->lock, flags); -out_unlock: - mutex_unlock(&parent_ctx->mutex); - - perf_unpin_context(parent_ctx); - put_ctx(parent_ctx); - return ret; + return 0; } /*