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From: Roman Gushchin To: Sukadev Bhattiprolu Cc: Andrew Morton , Rik van Riel , Roman Gushchin , Vlastimil Babka , Joonsoo Kim , Minchan Kim , Chris Goldsworthy , Georgi Djakov , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] mm,page_alloc,cma: configurable CMA utilization Message-ID: References: <20230131071052.GB19285@hu-sbhattip-lv.qualcomm.com> <20230131201001.GA8585@hu-sbhattip-lv.qualcomm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230131201001.GA8585@hu-sbhattip-lv.qualcomm.com> X-Migadu-Flow: FLOW_OUT X-Rspamd-Queue-Id: C6D7780006 X-Stat-Signature: 8wfmf55x579j7gkjinaqfzbuagrdbfap X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1675209600-869165 X-HE-Meta: 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 fE2auRrC jsWc/XRm1suPKuEXqyvmzuW4h623oIBVZeFDUjS2ST2LMKj0Eo99Rwhi1FsxMh1tkl+9RJFBzNNLtkYg52OTqUQEgs2jVPOd9nDEwNw1NKm3buBnZ8rq+SfTdZYufUH2ulVxbAPyskiy177s07n50wEMPqJQD1XX/g+LvKGxa0tA0SdBt5mV+dnN4JCp3eQNI2ib1 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 Tue, Jan 31, 2023 at 12:10:01PM -0800, Sukadev Bhattiprolu wrote: > On Tue, Jan 31, 2023 at 10:10:40AM -0800, Roman Gushchin wrote: > > Hi Sukadev! > > > > Can you, please, share a bit more details about your setup? E.g. what is > > the zone size, the cma area size and the value you want to set your sysctl to? > > Hi Roman, > > I currently have a device with 8GB Zone normal and 600MB of CMA. We have a > slightly different implementation and use up all the available CMA region. > i.e. going forward, we intend to set the ratio to 100 or even higher. It means you want allocations be always served from a cma region first? What's the point of it? The idea behind the current formula is to keep cma regions free if there is a plenty of other free memory, otherwise treat it on par with other memory. To justify a new sysctl you really need a solid use case, which is not limited to your custom implementation. Also, if decide to go with a new sysctl, we probably want to define it differently, e.g. as a [0-1000)/1000 of the zone size. But, honestly, I'm not sold yet. Thanks!