From nobody Wed Dec 17 22:42:41 2025 Received: from out-187.mta1.migadu.com (out-187.mta1.migadu.com [95.215.58.187]) (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 1913DF510 for ; Fri, 14 Mar 2025 03:01:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.187 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741921273; cv=none; b=YmVuEeTd931Qp98bbfDgrOmhASC0um/J/gofmqLQEAFKU1b3srGxF3IzKBY6ebTYxSpudIw6DFEFkwTX2i8npHE/0GhdEW0/KxNp9r000xRxxLL5fzJBRchrYML9ulJqeQs4KIAtj/V66ZXS73fgghh1P7QY8NKAV/B5mjtV4DQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741921273; c=relaxed/simple; bh=OVSXdn/stpqtpu4N4hx38/r4z7BrOycAmkDikymqOv0=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=s/NXyP1DhJrxjmHgzaz6iILlD5SUhV/6/kuK1VHt+lkqbLeiLuI8No19zoto9CRpHaQwKsWC0Jkb+OPZaCaHpoCIXrIYu1YB6Ql2SlymJa3agSnF7NGZrU8Q2sY6j4MMGHPB6XcNGR9B4dZE1JRApYDatpD0DmWje4loUGXJEhQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=fNp/Onr+; arc=none smtp.client-ip=95.215.58.187 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="fNp/Onr+" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1741921268; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=ddR8PbHunJyeTeHkWYEZbpc6P3czHJwK0VLQdq1QbFQ=; b=fNp/Onr+uFnhbtZEwrh/PT51whjc6k3oCPRsPIjAvLsXyeyYhyeGR9hE2ogBh+poixemQl ve4UoO496/8n7CajD90O3h1vlSCKATtliR80xeEe8ivx+hqQQNavQE6luQ/7/FMlBMy0/x P+Ytho8tSYNKgySaQM7mCFdFJcVO3fQ= From: Tao Chen To: peterz@infradead.org, mingo@redhat.com, acme@kernel.org, namhyung@kernel.org, mark.rutland@arm.com, alexander.shishkin@linux.intel.com, jolsa@kernel.org, irogers@google.com, adrian.hunter@intel.com, kan.liang@linux.intel.com, fweisbec@gmail.com Cc: linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, Tao Chen Subject: [PATCH linux-next v2] perf/ring_buffer: Add EPOLLRDNORM flag for poll Date: Fri, 14 Mar 2025 11:00:36 +0800 Message-Id: <20250314030036.2543180-1-chen.dylane@linux.dev> 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 X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" The poll man page says POLLRDNORM is equivalent to POLLIN. For poll, it seems that if user sets pollfd with POLLRDNORM in userspace, perf_poll will not return until timeout even if perf_output_wakeup called, whereas PO= LLIN returns. Fixes: 76369139ceb9 ("perf: Split up buffer handling from core code") Signed-off-by: Tao Chen --- kernel/events/ring_buffer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Change list: - v1 -> v2: - add changelog - v1 https://lore.kernel.org/all/20250313051047.2436098-1-chen.dylane@linux.dev diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c index 59a52b1a1..5130b119d 100644 --- a/kernel/events/ring_buffer.c +++ b/kernel/events/ring_buffer.c @@ -19,7 +19,7 @@ =20 static void perf_output_wakeup(struct perf_output_handle *handle) { - atomic_set(&handle->rb->poll, EPOLLIN); + atomic_set(&handle->rb->poll, EPOLLIN | EPOLLRDNORM); =20 handle->event->pending_wakeup =3D 1; =20 --=20 2.43.0