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Wed, 11 Jan 2023 14:05:27 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id EQiRLCfCvmNfAwAAMHmgww (envelope-from ); Wed, 11 Jan 2023 14:05:27 +0000 Message-ID: <1eca7836-2e90-0ed8-7556-fa6be057aad2@suse.cz> Date: Wed, 11 Jan 2023 15:05:27 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.6.1 Subject: Re: [PATCH 5/7] mm/page_alloc.c: Allow __GFP_NOFAIL requests deeper access to reserves Content-Language: en-US To: Mel Gorman , Linux-MM Cc: Andrew Morton , Michal Hocko , NeilBrown , Thierry Reding , Matthew Wilcox , LKML References: <20230109151631.24923-1-mgorman@techsingularity.net> <20230109151631.24923-6-mgorman@techsingularity.net> From: Vlastimil Babka In-Reply-To: <20230109151631.24923-6-mgorman@techsingularity.net> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 796644001E X-Stat-Signature: yq4pf9grzeizm6673ifmycbw8faz9smn X-HE-Tag: 1673445929-301044 X-HE-Meta: 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 7VnxQetb kvpFbKHPBYLAkp4pcT9nGA41uTyrbD7IVHQoh+zKqUNwpEGa9AV2fLkHXhQ== 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 1/9/23 16:16, Mel Gorman wrote: > Currently __GFP_NOFAIL allocations without any other flags can access 25% > of the reserves but these requests imply that the system cannot make forward > progress until the allocation succeeds. Allow __GFP_NOFAIL access to 75% > of the min reserve. > > Signed-off-by: Mel Gorman Acked-by: Vlastimil Babka > --- > mm/page_alloc.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index 6f41b84a97ac..d2df78f5baa2 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -5308,7 +5308,7 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order, > * could deplete whole memory reserves which would just make > * the situation worse > */ > - page = __alloc_pages_cpuset_fallback(gfp_mask, order, ALLOC_HARDER, ac); > + page = __alloc_pages_cpuset_fallback(gfp_mask, order, ALLOC_MIN_RESERVE|ALLOC_HARDER, ac); > if (page) > goto got_pg; >