From nobody Fri Dec 19 08:56:24 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3FFDD18E371 for ; Fri, 30 Aug 2024 23:29:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725060553; cv=none; b=UkWyPMdVjRwdHX7GUjaSRtfSgNEe16oUWKZBra62RnTcAE9cWt3H7AUOfnHhgnXxn/Er0rV2mfq6CCo5oA/AtMFZxqGbO0Acb+mK4TAXA+7P3GyXOcEqSulGwo6dMXOsKVXzL/4O3BG9SdhifWqTWNpgyKcQNwgjLM1tNFONN7I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725060553; c=relaxed/simple; bh=4Ii+dUnPcg3T2XmEEMSdM+nVDagN9epzB1SA1hZllB4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=SA4e3hlvzn/yeR7foiEU50TRs0p5LqM0753yZm44SQllL3u7iTB4xOr5VMhfucOGoWdeqUdWruRiPjAFq/Ait5AzjfCv5H4iBSzrsK9kZGxyj7FGpYP/Y3EkW4cTF0TdjqNbyvrzbkPJYVB4hkxgXFkB5XoMit0T7IgWDa3NvA4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=gHdxcIQS; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="gHdxcIQS" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 68147C4CED0; Fri, 30 Aug 2024 23:29:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1725060552; bh=4Ii+dUnPcg3T2XmEEMSdM+nVDagN9epzB1SA1hZllB4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gHdxcIQSyj8sDVPy0zvrPbuqOj1SIuXRvBmMo9uKwkNYTAzoqTMuJxqcFPmmJFMIY /S3L6onv2WToAAQyjjmSnzTc0LsPtjfyuJ6bxg5Vhh5jQiiJyTkFy5H/ciJgsRwU2N zYVZWNohBgIdbuvd1ywt96hjxtCB5ec1k+ABi04otZ0WNoKcmDquA+sm4oEnaC5VXx EDSDN7auI2K2OBpPn9fP3Iwoaqhkm+Z7EpOGMQfykMWoUcV6rctdm6zVL0AI+nwjmA iVq/a046G9DD/Uk5WUzatN9S0KKFEBfidDFcWQiGWxE9Ky+6rIFQsyg6Ui8ks/f51S z+oJz2DIOADtw== From: Namhyung Kim To: Peter Zijlstra , Ingo Molnar Cc: Kan Liang , Mark Rutland , Alexander Shishkin , Arnaldo Carvalho de Melo , LKML , Stephane Eranian , Ravi Bangoria Subject: [RFC/PATCH 2/4] perf/core: Export perf_exclude_event() Date: Fri, 30 Aug 2024 16:29:08 -0700 Message-ID: <20240830232910.1839548-3-namhyung@kernel.org> X-Mailer: git-send-email 2.46.0.469.g59c65b2a67-goog In-Reply-To: <20240830232910.1839548-1-namhyung@kernel.org> References: <20240830232910.1839548-1-namhyung@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" And increase the dropped_sample count when it returns 1. Now it can track how many samples are dropped due to the privilege filters in software events. Signed-off-by: Namhyung Kim --- include/linux/perf_event.h | 2 ++ kernel/events/core.c | 11 +++++++---- 2 files changed, 9 insertions(+), 4 deletions(-) diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 955d39543398..c93673a8d66a 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -1634,6 +1634,8 @@ static inline int perf_allow_tracepoint(struct perf_e= vent_attr *attr) return security_perf_event_open(attr, PERF_SECURITY_TRACEPOINT); } =20 +extern int perf_exclude_event(struct perf_event *event, struct pt_regs *re= gs); + extern void perf_event_init(void); extern void perf_tp_event(u16 event_type, u64 count, void *record, int entry_size, struct pt_regs *regs, diff --git a/kernel/events/core.c b/kernel/events/core.c index 4d72538628ee..8250e76f6335 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -9978,18 +9978,21 @@ static void perf_swevent_event(struct perf_event *e= vent, u64 nr, perf_swevent_overflow(event, 0, data, regs); } =20 -static int perf_exclude_event(struct perf_event *event, - struct pt_regs *regs) +int perf_exclude_event(struct perf_event *event, struct pt_regs *regs) { if (event->hw.state & PERF_HES_STOPPED) return 1; =20 if (regs) { - if (event->attr.exclude_user && user_mode(regs)) + if (event->attr.exclude_user && user_mode(regs)) { + atomic64_inc(&event->dropped_samples); return 1; + } =20 - if (event->attr.exclude_kernel && !user_mode(regs)) + if (event->attr.exclude_kernel && !user_mode(regs)) { + atomic64_inc(&event->dropped_samples); return 1; + } } =20 return 0; --=20 2.46.0.469.g59c65b2a67-goog