Date: Fri, 13 Jul 2018 01:41:46 +0200 From: Mateusz Guzik <mjguzik@gmail.com> To: Mark Johnston <markj@freebsd.org> Cc: Mateusz Guzik <mjg@freebsd.org>, src-committers <src-committers@freebsd.org>, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r336231 - head/sys/vm Message-ID: <CAGudoHGZV8mcKGLwJKi7zBAtufKW63YO2ro7Yp=TsPqv9=HWeA@mail.gmail.com> In-Reply-To: <20180712225856.GA26064@raichu> References: <201807122235.w6CMZqO8030291@repo.freebsd.org> <20180712225856.GA26064@raichu>
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uma_zone_get_cur iterates the per-cpu stats and looks at the zone-global stats. The patch only gets rid of rolling them up, thus there is no difference from the pov of this func. I don't follow the remark about uma_reclaim. On Fri, Jul 13, 2018 at 12:58 AM, Mark Johnston <markj@freebsd.org> wrote: > On Thu, Jul 12, 2018 at 10:35:52PM +0000, Mateusz Guzik wrote: > > Author: mjg > > Date: Thu Jul 12 22:35:52 2018 > > New Revision: 336231 > > URL: https://svnweb.freebsd.org/changeset/base/336231 > > > > Log: > > uma: whack main zone counter update in the slow path, freeing side > > > > See r333052. > > > > Modified: > > head/sys/vm/uma_core.c > > > > Modified: head/sys/vm/uma_core.c > > ============================================================ > ================== > > --- head/sys/vm/uma_core.c Thu Jul 12 22:34:40 2018 (r336230) > > +++ head/sys/vm/uma_core.c Thu Jul 12 22:35:52 2018 (r336231) > > @@ -3135,14 +3135,6 @@ zfree_start: > > cpu = curcpu; > > cache = &zone->uz_cpu[cpu]; > > > > - /* > > - * Since we have locked the zone we may as well send back our > stats. > > - */ > > - atomic_add_long(&zone->uz_allocs, cache->uc_allocs); > > - atomic_add_long(&zone->uz_frees, cache->uc_frees); > > - cache->uc_allocs = 0; > > - cache->uc_frees = 0; > > - > > Doesn't this break the accounting of these stats? uma_reclaim() doesn't > update them when it frees cached items, and uma_zone_get_cur() doesn't > look at the stats for cached buckets. > -- Mateusz Guzik <mjguzik gmail.com>
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