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Tue, 3 Aug 2021 15:20:41 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap1.suse-dmz.suse.de with ESMTPSA id C7/hA8leCWEEdgAAGKfGzw (envelope-from ); Tue, 03 Aug 2021 15:20:41 +0000 Subject: Re: [PATCH] mm: memcontrol: Set the correct memcg swappiness restriction To: Michal Hocko , Baolin Wang Cc: akpm@linux-foundation.org, hannes@cmpxchg.org, vdavydov.dev@gmail.com, cgroups@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: From: Vlastimil Babka Message-ID: <6e6570d2-44a2-1da1-6c2a-38766786c40c@suse.cz> Date: Tue, 3 Aug 2021 17:20:40 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 8DB047007730 Authentication-Results: imf02.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=QQKupwhL; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=Q2d1r4Hm; dmarc=none; spf=pass (imf02.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.29 as permitted sender) smtp.mailfrom=vbabka@suse.cz X-Stat-Signature: 9xr6j3p1zx9zmjhhdehu5thsu9jrdxj8 X-HE-Tag: 1628004042-878112 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 7/30/21 8:39 AM, Michal Hocko wrote: > On Fri 30-07-21 14:26:35, Baolin Wang wrote: >> Since commit c843966c556d ("mm: allow swappiness that prefers reclaiming >> anon over the file workingset") has expended the swappiness value to >> make swap to be preferred in some systems. We should also change the >> memcg swappiness restriction to allow memcg swap-preferred. >> >> Signed-off-by: Baolin Wang > > Yes, this looks like an omission. It doesn't really make sense to have > two different constrains on the value. > > Acked-by: Michal Hocko So, also Fixes: c843966c556d ("mm: allow swappiness that prefers reclaiming anon over the file workingset") ? > Thanks! > >> --- >> mm/memcontrol.c | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/mm/memcontrol.c b/mm/memcontrol.c >> index 6580c23..988fc94 100644 >> --- a/mm/memcontrol.c >> +++ b/mm/memcontrol.c >> @@ -4046,7 +4046,7 @@ static int mem_cgroup_swappiness_write(struct cgroup_subsys_state *css, >> { >> struct mem_cgroup *memcg = mem_cgroup_from_css(css); >> >> - if (val > 100) >> + if (val > 200) >> return -EINVAL; >> >> if (!mem_cgroup_is_root(memcg)) >> -- >> 1.8.3.1 >