From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta0.migadu.com (out-144.mta0.migadu.com [91.218.175.144]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 54DF84ACC9A for ; Tue, 15 Sep 2026 15:41:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.144 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789486914; cv=none; b=iFH1i3cptFLvz6AzWWs0QvYfHzDZKGabT0ypoEfFl37f55BLPDOjcTJe2rlh7AaG64vFpRktEEp86MNQGDqZeM3Nzc9SmJxUUvYUbLDDU5vIriY/rYrbM8e0azUoKoZSSOIsi1KB5UTvvalxd9RqyrP+xQUyqAggQf7JVF2zVM0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789486914; c=relaxed/simple; bh=XoHDbXQlVytUY1/OtZnF5kVtFi86nkj4PDGcug/MKCg=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=fSqB7vVOCabxIjsonTqWj2nGTOykP1860j4Qy2p3jk8Vq8nJ59dH3DPyJ3lQ4UOQb8wThv+JIAwHqdqCj3Jl/5+jQ7mj04winPXocZXddb/4UpI9N1sfPlu3mmlQfAAh7LOLlbniaq744Y3DxZkPIE86k5QPsPjDCWZtnzCwadU= 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=B/z0mUZA; arc=none smtp.client-ip=91.218.175.144 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="B/z0mUZA" X-Envelope-To: linux-xfs@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=XoHDbXQlVytUY1/OtZnF5kVtFi86nkj4PDGcug/MKCg=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1789486908; v=1; x=1790091708; b=B/z0mUZA/z0QuwiKPfppUvgy8SQlwn/fMTa70A0SqtyGmcCj8y0azKhbxd0bUTxkWbxPy5tH L+yz5nyymqMGYgOC7TAwt3mlCS1DS3U/Y53Rt5Y6Qg7VWdevAMGVFDtnbsZkBZfnLLilF/aBPm0 1QeZz7Qr/5FtjXn6AcQRclEE= X-Envelope-To: linux-xfs@vger.kernel.org Received: by mta11.migadu.com with ESMTPS id d9356d53b426894b; Tue, 15 Sep 2026 15:41:48 +0000 X-Mizu-Trace-ID: d9356d53b426894b X-Migadu-Flow: FLOW_OUT Message-ID: Date: Tue, 15 Sep 2026 16:41:43 +0100 Precedence: bulk X-Mailing-List: linux-xfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [bug report] fstests generic/774 hang again To: "Darrick J. Wong" Cc: Shin'ichiro Kawasaki , "linux-xfs@vger.kernel.org" References: <98190f62-ccc3-49df-934d-f168e293c485@linux.dev> <20260915145046.GC2705364@frogsfrogsfrogs> Content-Language: en-US From: John Garry In-Reply-To: <20260915145046.GC2705364@frogsfrogsfrogs> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 9/15/26 15:50, Darrick J. Wong wrote: >> thanks >> >> About the kernel code, I am wondering if using IOMAP_DIO_FORCE_WAIT for >> CoW-based atomics could help avoid this issue as we seem to be bogged down >> in lock contention. > Which lock is being contended, anyway? It looks like the ILOCK? Yeah, I think so Re. ilock. I had some perf data illustrating this from last year, which I can't seem to find, so I will re-generate it.