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[209.85.220.41]) by mx.google.com with SMTPS id g184sor3620290qkd.150.2019.07.11.09.23.44 for (Google Transport Security); Thu, 11 Jul 2019 09:23:44 -0700 (PDT) Received-SPF: pass (google.com: domain of shy828301@gmail.com designates 209.85.220.41 as permitted sender) client-ip=209.85.220.41; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b="o/LUmCZW"; spf=pass (google.com: domain of shy828301@gmail.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=shy828301@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=NgX19u0heI/R9GWSrmSZNT4oXJAtelbkkimiVF3UJzg=; b=o/LUmCZWkgTrcmhPKv8NkFW78o92UlJzuBXusnFMwkh7utqZW2QGe2OexZjtL3Nhxg CuJlJwVYc0Ppan7qHJFg0lMTlVKAAMD/vnxeyK1xZx3DfvJK3DJ3Te9gFRF6f3JCYmDU oNFrn2mMh2w66PT6BPmvpbt9Y/5AL1rsLk9GhrsK/BhVxlp5th2/JigoiA3beLqCokHW I+4kuwEba+WFqG4JM9pLtFQsKqYuhzBP2oyChTMI4TxCK+DiUGSXHpSxf9l5xXkqVoBm aLJ3XGyvSR3nDaUUeg3shiB994CzxjaiVml2cNCDwRQAmPPezCw+juvoaMQJn9BoKC6h 9Gvw== X-Google-Smtp-Source: APXvYqwey4uPl4IaE9JFBv32+4j1YHIKEWpv3x5NtBhnHzyKEWNSgbxrfRXCyxtrZKLOyIsBZxsaa8ddLeaeW1pvSas= X-Received: by 2002:a37:4ad7:: with SMTP id x206mr2695437qka.85.1562862224235; Thu, 11 Jul 2019 09:23:44 -0700 (PDT) MIME-Version: 1.0 References: <20190710144138.qyn4tuttdq6h7kqx@linutronix.de> <20190711094324.ninnmarx5r3amz4p@linutronix.de> In-Reply-To: <20190711094324.ninnmarx5r3amz4p@linutronix.de> From: Yang Shi Date: Thu, 11 Jul 2019 09:23:31 -0700 Message-ID: Subject: Re: Memory compaction and mlockall() To: Sebastian Andrzej Siewior Cc: Linux MM , Thomas Gleixner Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Jul 11, 2019 at 2:43 AM Sebastian Andrzej Siewior wrote: > > On 2019-07-10 11:21:19 [-0700], Yang Shi wrote: > > > > compaction should not isolate unevictable pages unless you have > > /proc/sys/vm/compact_unevictable_allowed set. > > Thank you. This is enabled by default. The documentation for this says > | =E2=80=A6 compaction is allowed to examine the unevictable lru (mlocked= pages) for > | pages to compact.=E2=80=A6 > > so it is actually clear once you know where to look. > If I read this correct, the default behavior was to ignore mlock()ed > pages for compaction then commit > 5bbe3547aa3ba ("mm: allow compaction of unevictable pages") Yes, before this commit compaction doesn't migrate unevictable pages. But, other types of migration always do. > > came along in v4.1-rc1 and changed that behaviour. Is it too late to > flip it back? Disabling it via proc knob isn't fine? > > Sebastian