From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (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 4A7B0309DAF; Tue, 27 Jan 2026 18:48:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769539719; cv=none; b=WyfCamuyAlgDaaLPgSLrR4HFTvbsb/YEgxLzvK7n2bDVbS3U+UX+mKPFqMKO457+RDi87SkwPLQPHeurRPFzNRdCxzPvnMka7XewDvrt1HPtxdNnzpQde5DPftyWGQng/F0Ql8jRNe3vVjiyy1Tl1mwuEsMnCr7XMGVTxOHDKtQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769539719; c=relaxed/simple; bh=9Kb41GNzFdnMC+EFq433D0Buo8fGVFgZu1BYS4b9488=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=T2oZBXaOl77Ojh12QcwuaaHF+XegB+zctAJfcHxzOahBn8u+fekGhO+Cicpp1Ocl81frjymcgYyxcHjtuP3K2nAHSi7m24twNZ3l2cAW2pllLzOtzGPzp8wu51YfVQmaCeLGqOwZyuHuZFye0cl/COCLYJ+N/Ck23LmmJ+jF9dE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=X2XQH8xm; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="X2XQH8xm" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=obdC9iXBZdS6X6d26P7qD6oiizDlQ0sUiMP+WtFKBeM=; b=X2XQH8xmsnFy17u8Wtukg1lls0 cCSpQfIIHvvQzC8rb0ntZFmRy9i3NLmxkQwZUgIIXuaggogve2YG2VV0Uxo5PphWN3QqF7VoSj/sL 1XkPKIc7jKeFnirKiuNCp9rRD4UpqZQEjd17OVQNf8kDeKCjcHAYdy8WNt/yLM9TBNiJ1GX8sEM6b Yo5nLuV7oY5/77a8c0e5BzW+nD8WBAFIXeWsHwk5DRh3V9g51aVT0DPzSQCkPtdSnExaxCWR1Y24a 0TPi+oKuFALaJJuqyYSz51tWhMdJ5EdI/RSqDXcyvCWJ4SXZUVjlLXg+dsAt3USinCubcf9rQOs5S k35eD8BA==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1vko6w-00000007rWg-1HVN; Tue, 27 Jan 2026 18:48:22 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 117F5303076; Tue, 27 Jan 2026 19:48:20 +0100 (CET) Date: Tue, 27 Jan 2026 19:48:20 +0100 From: Peter Zijlstra To: Prakash Sangappa Cc: Thomas Gleixner , LKML , Mathieu Desnoyers , "Paul E. McKenney" , Boqun Feng , Jonathan Corbet , Madadi Vineeth Reddy , K Prateek Nayak , Steven Rostedt , Sebastian Andrzej Siewior , Arnd Bergmann , "linux-arch@vger.kernel.org" , Randy Dunlap , Ron Geva , Waiman Long Subject: Re: [patch V6 07/11] rseq: Implement time slice extension enforcement timer Message-ID: <20260127184820.GC3372621@noisy.programming.kicks-ass.net> References: <20251215155615.870031952@linutronix.de> <20251215155709.068329497@linutronix.de> <20260117095737.GG1890602@noisy.programming.kicks-ass.net> <3FF1C1CB-ACE5-485A-8BFB-AFE561CA6EC1@oracle.com> Precedence: bulk X-Mailing-List: linux-arch@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3FF1C1CB-ACE5-485A-8BFB-AFE561CA6EC1@oracle.com> On Fri, Jan 23, 2026 at 05:41:16PM +0000, Prakash Sangappa wrote: > The database setup is on an older environment. The python script provided does not run as is. > So, modified it to gather the stats by parsing trace-cmd report output. I 'wrote' it against this thing: https://github.com/rostedt/trace-cmd/blob/master/python/tracecmd.py > ======================================== > RSEQ SLICE HISTOGRAM (us) > ======================================== > > Task: ora_dbwr_lmb-666257 Mean: 1593.058 ns > Latency (us) | Count > ------------------------------ > EXPIRED | 3 > 0 us | 8 > 1 us | 116 > 2 us | 25 > 3 us | 2 > 4 us | 1 > 7 us | 1 > > Task: ora_dbwd_lmb-666196 Mean: 1548.641 ns > Latency (us) | Count > ------------------------------ > EXPIRED | 6 > 0 us | 19 > 1 us | 203 > 2 us | 33 > 4 us | 2 > 5 us | 1 > > > [..] > > Task: oracle_668951_l-668951 Mean: 1797.796 ns > Latency (us) | Count > ------------------------------ > 1 us | 5 > 2 us | 1 > 3 us | 2 > > Task: oracle_671571_l-671571 Mean: 3285.425 ns > Latency (us) | Count > ------------------------------ > 1 us | 1 > 3 us | 1 > 5 us | 1 > 6 us | 1 > 10 us | 1 > > Task: oracle_672277_l-672277 Mean: 2361.600 ns > Latency (us) | Count > ------------------------------ > 1 us | 4 > 2 us | 3 > 5 us | 1 > 7 us | 1 > 9 us | 1 > 11 us | 1 > > Task: ora_dbwb_lmb-666192 Mean: 1548.157 ns > Latency (us) | Count > ------------------------------ > EXPIRED | 10 > 0 us | 24 > 1 us | 182 > 2 us | 39 > 3 us | 2 > 4 us | 4 > 5 us | 1 > 14 us | 1 Thanks! that seems to confirm that 5us should be good enough for you guys too.