From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mout.gmx.net (mout.gmx.net [212.227.17.20]) (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 9888C2C9D for ; Tue, 30 Nov 2021 12:00:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1638273622; bh=86mLRP7RxLciX6WFesgCpFI0qfy9gXogt8D2ha7z4+A=; h=X-UI-Sender-Class:Subject:From:To:Cc:Date:In-Reply-To:References; b=AXivPj5XQ42x2j05j7S7RsluKY6J0DKySHx2IYzGEZWs3E1q5T7RSqLrp3G9GLwNk 0akdRYeC/XPTuKnQAVQCaV/ngA4FM097mYbxzBdeisObq2J6LHWVqy4sejvkBbFZOV dPwdwR6mGr4aLnBritwZEcB/Z5qCoxnO/Q/75U80= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from homer.fritz.box ([185.146.50.175]) by mail.gmx.net (mrgmx105 [212.227.17.168]) with ESMTPSA (Nemesis) id 1N1OXT-1mTnrh0aQF-012nJz; Tue, 30 Nov 2021 13:00:22 +0100 Message-ID: Subject: Re: [PATCH 1/1] mm: vmscan: Reduce throttling due to a failure to make progress From: Mike Galbraith To: Mel Gorman Cc: Alexey Avramov , Andrew Morton , Michal Hocko , Vlastimil Babka , Rik van Riel , Darrick Wong , regressions@lists.linux.dev, Linux-fsdevel , Linux-MM , LKML Date: Tue, 30 Nov 2021 13:00:18 +0100 In-Reply-To: <20211130112244.GQ3366@techsingularity.net> References: <20211125151853.8540-1-mgorman@techsingularity.net> <20211127011246.7a8ac7b8@mail.inbox.lv> <20211129150117.GO3366@techsingularity.net> <20211130112244.GQ3366@techsingularity.net> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.42.1 Precedence: bulk X-Mailing-List: regressions@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:Q8Rcm+TDsMGclzpLvPpIUOG460Khlbhybxb+OmjHoQ7eWlSZjwe iInZPJV5ei36SlSySfzp57ZCs3OM51mS7uS/FRFL1ovBCSwF4GcSRjYfvB7Q+GCdpxR2D4m hnr5S95PsvQKQWjyQuTejCqngOfcVJ6Xck3dqr7ySjF+TRZAV6ZlB8yiDsxB0PN9R/O3Lrw dYGqpUqgAVY6735G5zwQw== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:4FgWfCmXmJQ=:QpOMsYUbzenGVGbOqzhwNZ 6zL4AIN0w6dOK7sxB0IFmJyv9C0MlwGzHcOgoyoBEcsYUXF1QLYv+6l6+HtcVhdTaDlHQi8rG FmAVvq4RLvC4cD2ndlS4Or4dvJI+7w1edc5vRgEGoZajS76Kka0UfMBuJEP64QfaIctGFLi1e ivjCCcE7w7K5m9l6gtdnfp+6TNkuQCrlJRATdOEscgSTB6qdEep+USC/PgMaEIppktbXifWRP Yse6KCWFtOCdsBG+p/ICWTqwbWFu2o0ELpkv0X1qCAevwEQ0WEGchfqfQvKSeM8J7nO9VZzgz YOJAO17bwfXFhN3PneNTivUuksJQRTJNPtKrKYdgjN4yiv4VPsY8yGZu+G1Q9keXC8HF2EpD/ di7q4Jj4gi8FA/kBto8U7SM5seeyqVLLPvgrwOPuHQ0mimAM36V2WUYfvxKN8y8DrWi7oubpw KAms+0Ts7QjiyQ1hOs+wrSGPdXL5tlrNdtnyiRZtoYGF5eWG+FoKoYOVbJUrXJe6xKmtqk6fH MhCJKhUN1Ti/fy9bBwfSpSFc8mIRLjbjOOXb5dJGX4IPpYnPa9MmjKkYbAJKn95g91tXM4l85 eOa35a6GtNrAWslosEccnoorhlhXkei+fs1w0BgOnChc4mmHWA0SVKvjMnudHP2E5rCM5qn8N s3NZBH8LtLVm6w72tZGtmXxuGEAj8Qa/AqwX809uMeJ8rpdz9JrZHkCsjDAB5OHrs7BLwkHnY mE61LUKvf8zdxWvFUssoTY87crGGn1Tb25LrL6YAsDWWy61rhRq6B6EQaQDHm8KHCwcQoon1K FodR4TDCsBKGhyZRadedT+SmZ7eojQnOAt62dcOUNWbhK4E35TaeReq5RpSTHfZMFUNLUNQBv bAZ7a1yJ95X1OfdF0Rt0EeOefVGLJ5ayfr866ugH1cOzb3bp7UoU980+hrLd+pAt5oj8Z3fOh WOEJc2k/qu8aRWSCoDkJfa3yPvqOaotVPfttvBEyIK2Rr1UCy+m4AATm0Yh6XyTuoiYlSDpix di9Qm9fHeZcJ/5il7uoFcI6soPBbPS7QYZSC0LXwmszfOB+5k1BE//erw+AU9ZQvn2eJpJ+l/ qUl/XvzRC87XzU= On Tue, 2021-11-30 at 11:22 +0000, Mel Gorman wrote: > On Tue, Nov 30, 2021 at 11:14:32AM +0100, Mike Galbraith wrote: > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0} > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (2 * write_pending <= =3D reclaimable) > > > > That is always true here... > > > > Always true for you or always true in general? "Here" as in the boxen located at my GPS coordinates :) > The intent of the check is "are a majority of reclaimable pages > marked WRITE_PENDING?". It's similar to the check that existed prior > to 132b0d21d21f ("mm/page_alloc: remove the throttling logic from the > page allocator"). I'll put my trace_printk() back and see if I can't bend-adjust it. -Mike