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Thu, 29 Jul 2021 15:27:19 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap1.suse-dmz.suse.de with ESMTPSA id UUxiBtfIAmE5LgAAGKfGzw (envelope-from ); Thu, 29 Jul 2021 15:27:19 +0000 Subject: Re: [PATCH v3 00/35] SLUB: reduce irq disabled scope and make it RT compatible To: Sebastian Andrzej Siewior Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Christoph Lameter , David Rientjes , Pekka Enberg , Joonsoo Kim , Mike Galbraith , Thomas Gleixner , Mel Gorman , Jesper Dangaard Brouer , Jann Horn References: <20210729132132.19691-1-vbabka@suse.cz> <20210729152400.ed35ocv5jtpf3ns5@linutronix.de> From: Vlastimil Babka Message-ID: <803269ba-d4f4-6016-067f-8f9e02b3c794@suse.cz> Date: Thu, 29 Jul 2021 17:27:18 +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: <20210729152400.ed35ocv5jtpf3ns5@linutronix.de> Content-Type: text/plain; charset=utf-8 Content-Language: en-US X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: BB90B7001A0A Authentication-Results: imf02.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=2m4o1jAu; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=e4hdKnOo; dmarc=none; spf=pass (imf02.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.28 as permitted sender) smtp.mailfrom=vbabka@suse.cz X-Stat-Signature: 45be9ogtwwnzzn51ijso8t4m9o58ogi3 X-HE-Tag: 1627572440-589982 Content-Transfer-Encoding: quoted-printable 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 7/29/21 5:24 PM, Sebastian Andrzej Siewior wrote: > On 2021-07-29 15:20:57 [+0200], Vlastimil Babka wrote: >> Changes since v2 [5]: >=20 > With PARTIAL enabled on top of -rc3: Is that also PREEMPT_RT? Interesting... > | root@debpg:~# grep ^kmalloc-512 /proc/slabinfo > | kmalloc-512 3552 3552 512 32 4 : tunables 0 0= 0 : slabdata 111 111 0 > | root@debpg:~# hackbench -g80 > | Running in process mode with 80 groups using 40 file descriptors each= (=3D=3D 3200 tasks) > | Each sender will pass 100 messages of 100 bytes > | Time: 0.643 > | root@debpg:~# grep ^kmalloc-512 /proc/slabinfo > | kmalloc-512 954080 954080 512 32 4 : tunables 0 0= 0 : slabdata 29815 29815 0 > | root@debpg:~# hackbench -g80 > | Running in process mode with 80 groups using 40 file descriptors each= (=3D=3D 3200 tasks) > | Each sender will pass 100 messages of 100 bytes > | Time: 0.604 > | root@debpg:~# grep ^kmalloc-512 /proc/slabinfo > | kmalloc-512 1647904 1647904 512 32 4 : tunables 0 = 0 0 : slabdata 51497 51497 0 > | root@debpg:~# echo 1 > /sys/kernel/slab/kmalloc-512/shrink=20 > | root@debpg:~# grep ^kmalloc-512 /proc/slabinfo > | kmalloc-512 640 1120 512 32 4 : tunables 0 0= 0 : slabdata 35 35 0 >=20 > otherwise a few more hackbench invocations without manual shirnk lead t= o > OOM-killer: > | oom-kill:constraint=3DCONSTRAINT_NONE,nodemask=3D(null),cpuset=3D/,me= ms_allowed=3D0,task=3Dsystemd-logind,pid=3D1713,uid=3D0 > | Out of memory: Killed process 1713 (systemd-logind) total-vm:15720kB,= anon-rss:956kB, file-rss:0kB, shmem-rss:0kB, UID:0 pgtables:72kB oom_sco= re_adj:0 > | Mem-Info: > | active_anon:56 inactive_anon:24782 isolated_anon:0 > | active_file:13 inactive_file:45 isolated_file:0 > | unevictable:0 dirty:0 writeback:0 > | slab_reclaimable:8749 slab_unreclaimable:894017 > | mapped:68 shmem:118 pagetables:28612 bounce:0 > | free:8407 free_pcp:36 free_cma:0 > | Node 0 active_anon:224kB inactive_anon:99128kB active_file:260kB inac= tive_file:712kB unevictable:0kB isolated(anon):0kB isolated(file):0kB map= ped:764kB dirty:0kB writebaco > | Node 0 DMA free:15360kB min:28kB low:40kB high:52kB reserved_highatom= ic:0KB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0k= B unevictable:0kB writependiB > | lowmem_reserve[]: 0 1939 3915 3915 > | Node 0 DMA32 free:11696kB min:3960kB low:5944kB high:7928kB reserved_= highatomic:0KB active_anon:0kB inactive_anon:40740kB active_file:0kB inac= tive_file:4kB unevictable:0kB > | lowmem_reserve[]: 0 0 1975 1975 > | Node 0 Normal free:5692kB min:4032kB low:6052kB high:8072kB reserved_= highatomic:0KB active_anon:224kB inactive_anon:58440kB active_file:440kB = inactive_file:100kB unevictaB > | lowmem_reserve[]: 0 0 0 0 > | Node 0 DMA: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB = 1*1024kB (U) 1*2048kB (M) 3*4096kB (M) =3D 15360kB > | Node 0 DMA32: 11*4kB (UM) 15*8kB (M) 20*16kB (UME) 12*32kB (UME) 7*64= kB (ME) 5*128kB (UME) 4*256kB (UM) 6*512kB (ME) 4*1024kB (M) 1*2048kB (M)= 0*4096kB =3D 12196kB > | Node 0 Normal: 324*4kB (UME) 221*8kB (UME) 60*16kB (UM) 24*32kB (UME)= 5*64kB (UM) 2*128kB (U) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB =3D 5= 368kB > | Node 0 hugepages_total=3D0 hugepages_free=3D0 hugepages_surp=3D0 huge= pages_size=3D2048kB > | 189 total pagecache pages > | 0 pages in swap cache > | Swap cache stats: add 0, delete 0, find 0/0 > | Free swap =3D 0kB > | Total swap =3D 0kB > | 1048432 pages RAM > | 0 pages HighMem/MovableOnly > | 41108 pages reserved > | Unreclaimable slab info: > =E2=80=A6 > | kmalloc-512 2144352KB 2144352KB >=20 > This does not happen if I disable SLUB_CPU_PARTIAL. >=20 > Sebastian >=20