From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 84C2C16CD33; Mon, 22 Sep 2025 06:26:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758522397; cv=none; b=Ov0UnjCMlEy9Q6TOoTL39HbNJ1reXImPPWOETnenC74zxjzHcEFjssp5EKcVaJTeExbzMHCQHEnDa3qFeAkZBT6NaA4ZsOGL7eQg/brkbagWECdj2D1aio6PSh7YB1ekWzxB3DBY/5sdvE7wmWaqSuLVw0eqqp8sTQ6a+ja+PJg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758522397; c=relaxed/simple; bh=mTlCST+NV6monq4VDOGsq1nkeaCC9gjKSnK3woeXd44=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=vE5fw6KmIJATxmGCIjO11ILPCZm2BvaRJhtqQCWGPv2+A7f0IZ1vKxnMFbLDsEfeGYLcetA7LONJg3hfwLg+OaK04v8Gp7XCrTj2mcojdGArC29C2pt09J+sgrhvGb1ft35GjeBV3zLc+yPmV3QTFFp1PGgi9NvDGml2tMPhwlg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=CwsjDxxl; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=wu4D2YFm; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="CwsjDxxl"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="wu4D2YFm" From: Nam Cao DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1758522392; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=mTlCST+NV6monq4VDOGsq1nkeaCC9gjKSnK3woeXd44=; b=CwsjDxxlHNkml+W3XMI/NH9FoEPr3tY3Yipw6ooOdoWPglQmbvWmxh7WpyqD6T/rnr1BoX x8EYY1ToGm6T15s2flEIA8Q+uVu9Fq5dU8PF8pRGRdAafezhgagsUgH7RwPZlfCKbEOwiw EtuQntYV9GyksLRZB3WvX5we5IdsgxClxjspoVdEtlYXRd9NN+JM9cWUE3BuPNeUgB7Mn7 M0tov5A0Vry0YCWPREOJp41V58SeLiQ2Z6ivWgjTeQutq8gPRP6RMxrlhlz04m7jgkIWuX uVZ8im9wantJn0jr1Tha+FXSv9cLYzCSrkyYAkJFjjG3YFDDbbifEgpdKbIZ0g== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1758522392; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=mTlCST+NV6monq4VDOGsq1nkeaCC9gjKSnK3woeXd44=; b=wu4D2YFmKcfY9Afa/rL7Stcq7Qf4DibBFtqNw42AMRXDqiOqDyv4xakDvdI1GbFVrge3Sr CiNMfbqm2yd4ErDg== To: Mateusz Guzik , Khazhy Kumykov Cc: Alexander Viro , Christian Brauner , Jan Kara , Shuah Khan , Davidlohr Bueso , Soheil Hassas Yeganeh , Willem de Bruijn , Eric Dumazet , Jens Axboe , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH 2/2] eventpoll: Fix epoll_wait() report false negative In-Reply-To: References: <43d64ad765e2c47e958f01246320359b11379466.1752824628.git.namcao@linutronix.de> <87zfat19i7.fsf@yellow.woof> Date: Mon, 22 Sep 2025 08:26:30 +0200 Message-ID: <87qzvz9f55.fsf@yellow.woof> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain Mateusz Guzik writes: > a sequence counter around shenanigans will sort it out, but I don't > know if it is worth it and don't really want to investigate myself. The original commit did mention "1% CPU/RPC reduction in RPC benchmarks". I'm not sure what "RPC" stands for and which benchmark it is. But if it is really important, we must have heard by now. Nam