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[66.90.148.213]) by smtp.googlemail.com with ESMTPSA id w141sm118375oif.20.2021.10.19.16.19.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 Oct 2021 16:19:11 -0700 (PDT) From: Rob Herring To: Will Deacon , Mark Rutland , Peter Zijlstra Cc: Vince Weaver , honnappa.nagarahalli@arm.com, Zachary.Leaf@arm.com, Catalin Marinas , Ingo Molnar , Arnaldo Carvalho de Melo , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Thomas Gleixner , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-perf-users@vger.kernel.org Subject: [PATCH v11 2/5] perf: Add a counter for number of user access events in context Date: Tue, 19 Oct 2021 18:19:04 -0500 Message-Id: <20211019231907.1009567-3-robh@kernel.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20211019231907.1009567-1-robh@kernel.org> References: <20211019231907.1009567-1-robh@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211019_161912_333524_4FE344AE X-CRM114-Status: GOOD ( 15.32 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org For controlling user space counter access, we need to know if any event in a context (currently scheduled or not) is using user space counters. Walking the context's list of events would be slow, so add a counter to track this. Reviewed-by: Mark Rutland Signed-off-by: Rob Herring --- v10: - Re-added. - Maintain the count in the perf core v9: - Dropped v8: - new patch --- include/linux/perf_event.h | 1 + kernel/events/core.c | 4 ++++ 2 files changed, 5 insertions(+) diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 34ebcc9af608..d733cac749e2 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -828,6 +828,7 @@ struct perf_event_context { int nr_events; int nr_active; + int nr_user; int is_active; int nr_stat; int nr_freq; diff --git a/kernel/events/core.c b/kernel/events/core.c index 744e8726c5b2..01290d150da3 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -1808,6 +1808,8 @@ list_add_event(struct perf_event *event, struct perf_event_context *ctx) list_add_rcu(&event->event_entry, &ctx->event_list); ctx->nr_events++; + if (event->hw.flags & PERF_EVENT_FLAG_USER_READ_CNT) + ctx->nr_user++; if (event->attr.inherit_stat) ctx->nr_stat++; @@ -1999,6 +2001,8 @@ list_del_event(struct perf_event *event, struct perf_event_context *ctx) event->attach_state &= ~PERF_ATTACH_CONTEXT; ctx->nr_events--; + if (event->hw.flags & PERF_EVENT_FLAG_USER_READ_CNT) + ctx->nr_user--; if (event->attr.inherit_stat) ctx->nr_stat--; -- 2.32.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel