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Date: Fri, 15 May 2020 16:38:14 +0800 From: Feng Tang <feng.tang@...el.com> To: Michal Hocko <mhocko@...nel.org> Cc: Andrew Morton <akpm@...ux-foundation.org>, Johannes Weiner <hannes@...xchg.org>, Matthew Wilcox <willy@...radead.org>, Mel Gorman <mgorman@...e.de>, Kees Cook <keescook@...omium.org>, Luis Chamberlain <mcgrof@...nel.org>, Iurii Zaikin <yzaikin@...gle.com>, "Kleen, Andi" <andi.kleen@...el.com>, "Chen, Tim C" <tim.c.chen@...el.com>, "Hansen, Dave" <dave.hansen@...el.com>, "Huang, Ying" <ying.huang@...el.com>, "linux-mm@...ck.org" <linux-mm@...ck.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 3/3] mm: adjust vm_committed_as_batch according to vm overcommit policy On Fri, May 15, 2020 at 03:44:43PM +0800, Michal Hocko wrote: > On Fri 08-05-20 15:25:17, Feng Tang wrote: > > When checking a performance change for will-it-scale scalability > > mmap test [1], we found very high lock contention for spinlock of > > percpu counter 'vm_committed_as': > > Btw. you are focusing on a microbenchmark here but I believe that there > are non-synthetic worklaods which would benefit from a larger batch. > E.g. large in memory databases which do large mmaps during startups > from multiple threads. I imagined cases like this too :) but was not sure there are such cases. So I only put down the the benchmark I've worked with in 0day. Thanks, Feng > -- > Michal Hocko > SUSE Labs
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