From: Mike Galbraith <efault@gmx.de>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Vlastimil Babka <vbabka@suse.cz>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Christoph Lameter <cl@linux.com>,
David Rientjes <rientjes@google.com>,
Pekka Enberg <penberg@kernel.org>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Thomas Gleixner <tglx@linutronix.de>,
Mel Gorman <mgorman@techsingularity.net>,
Jesper Dangaard Brouer <brouer@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Jann Horn <jannh@google.com>
Subject: Re: [RFC v2 00/34] SLUB: reduce irq disabled scope and make it RT compatible
Date: Sat, 03 Jul 2021 09:24:39 +0200 [thread overview]
Message-ID: <891dc24e38106f8542f4c72831d52dc1a1863ae8.camel@gmx.de> (raw)
In-Reply-To: <20210702182944.lqa7o2a25to6czju@linutronix.de>
On Fri, 2021-07-02 at 20:29 +0200, Sebastian Andrzej Siewior wrote:
> I replaced my slub changes with slub-local-lock-v2r3.
> I haven't seen any complains from lockdep or so which is good. Then I
> did this with RT enabled (and no debug):
Below is some raw hackbench data from my little i4790 desktop box. It
says we'll definitely still want list_lock to be raw.
It also appears to be saying that there's something RT specific to
stare at in addition to the list_lock business, but add a pinch of salt
to that due to the config of the virgin(ish) tip tree being much
lighter than the enterprise(ish) config of the tip-rt tree.
perf stat -r10 hackbench -s4096 -l500
full warmup, record, repeat twice for elapsed
5.13.0.g60ab3ed-tip-rt
8,898.51 msec task-clock # 7.525 CPUs utilized ( +- 0.33% )
368,922 context-switches # 0.041 M/sec ( +- 5.20% )
42,281 cpu-migrations # 0.005 M/sec ( +- 5.28% )
13,180 page-faults # 0.001 M/sec ( +- 0.70% )
33,343,378,867 cycles # 3.747 GHz ( +- 0.30% )
21,656,783,887 instructions # 0.65 insn per cycle ( +- 0.67% )
4,408,569,663 branches # 495.428 M/sec ( +- 0.73% )
12,040,125 branch-misses # 0.27% of all branches ( +- 2.93% )
1.18260 +- 0.00473 seconds time elapsed ( +- 0.40% )
1.19018 +- 0.00441 seconds time elapsed ( +- 0.37% ) (repeat)
1.18260 +- 0.00473 seconds time elapsed ( +- 0.40% ) (repeat)
5.13.0.g60ab3ed-tip-rt +slub-local-lock-v2r3 list_lock=raw_spinlock_t
9,642.00 msec task-clock # 7.521 CPUs utilized ( +- 0.46% )
462,091 context-switches # 0.048 M/sec ( +- 4.79% )
44,411 cpu-migrations # 0.005 M/sec ( +- 4.34% )
12,980 page-faults # 0.001 M/sec ( +- 0.43% )
36,098,859,429 cycles # 3.744 GHz ( +- 0.44% )
25,462,853,462 instructions # 0.71 insn per cycle ( +- 0.50% )
5,260,898,360 branches # 545.623 M/sec ( +- 0.52% )
16,088,686 branch-misses # 0.31% of all branches ( +- 2.02% )
1.28207 +- 0.00568 seconds time elapsed ( +- 0.44% )
1.28744 +- 0.00713 seconds time elapsed ( +- 0.55% ) (repeat)
1.28085 +- 0.00850 seconds time elapsed ( +- 0.66% ) (repeat)
5.13.0.g60ab3ed-tip-rt +slub-local-lock-v2r3 list_lock=spinlock_t
10,004.89 msec task-clock # 6.029 CPUs utilized ( +- 1.37% )
654,311 context-switches # 0.065 M/sec ( +- 5.16% )
211,070 cpu-migrations # 0.021 M/sec ( +- 1.38% )
13,262 page-faults # 0.001 M/sec ( +- 0.79% )
36,585,914,931 cycles # 3.657 GHz ( +- 1.35% )
27,682,240,511 instructions # 0.76 insn per cycle ( +- 1.06% )
5,766,064,432 branches # 576.325 M/sec ( +- 1.11% )
24,269,069 branch-misses # 0.42% of all branches ( +- 2.03% )
1.6595 +- 0.0116 seconds time elapsed ( +- 0.70% )
1.6270 +- 0.0180 seconds time elapsed ( +- 1.11% ) (repeat)
1.6213 +- 0.0150 seconds time elapsed ( +- 0.93% ) (repeat)
virgin(ish) tip
5.13.0.g60ab3ed-tip
7,320.67 msec task-clock # 7.792 CPUs utilized ( +- 0.31% )
221,215 context-switches # 0.030 M/sec ( +- 3.97% )
16,234 cpu-migrations # 0.002 M/sec ( +- 4.07% )
13,233 page-faults # 0.002 M/sec ( +- 0.91% )
27,592,205,252 cycles # 3.769 GHz ( +- 0.32% )
8,309,495,040 instructions # 0.30 insn per cycle ( +- 0.37% )
1,555,210,607 branches # 212.441 M/sec ( +- 0.42% )
5,484,209 branch-misses # 0.35% of all branches ( +- 2.13% )
0.93949 +- 0.00423 seconds time elapsed ( +- 0.45% )
0.94608 +- 0.00384 seconds time elapsed ( +- 0.41% ) (repeat)
0.94422 +- 0.00410 seconds time elapsed ( +- 0.43% )
5.13.0.g60ab3ed-tip +slub-local-lock-v2r3
7,343.57 msec task-clock # 7.776 CPUs utilized ( +- 0.44% )
223,044 context-switches # 0.030 M/sec ( +- 3.02% )
16,057 cpu-migrations # 0.002 M/sec ( +- 4.03% )
13,164 page-faults # 0.002 M/sec ( +- 0.97% )
27,684,906,017 cycles # 3.770 GHz ( +- 0.45% )
8,323,273,871 instructions # 0.30 insn per cycle ( +- 0.28% )
1,556,106,680 branches # 211.901 M/sec ( +- 0.31% )
5,463,468 branch-misses # 0.35% of all branches ( +- 1.33% )
0.94440 +- 0.00352 seconds time elapsed ( +- 0.37% )
0.94830 +- 0.00228 seconds time elapsed ( +- 0.24% ) (repeat)
0.93813 +- 0.00440 seconds time elapsed ( +- 0.47% ) (repeat)
next prev parent reply other threads:[~2021-07-03 7:25 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-09 11:38 [RFC v2 00/34] SLUB: reduce irq disabled scope and make it RT compatible Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 01/34] mm, slub: don't call flush_all() from list_locations() Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 02/34] mm, slub: allocate private object map for sysfs listings Vlastimil Babka
2021-06-09 13:29 ` Christoph Lameter
2021-06-09 11:38 ` [RFC v2 03/34] mm, slub: allocate private object map for validate_slab_cache() Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 04/34] mm, slub: don't disable irq for debug_check_no_locks_freed() Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 05/34] mm, slub: remove redundant unfreeze_partials() from put_cpu_partial() Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 06/34] mm, slub: unify cmpxchg_double_slab() and __cmpxchg_double_slab() Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 07/34] mm, slub: extract get_partial() from new_slab_objects() Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 08/34] mm, slub: dissolve new_slab_objects() into ___slab_alloc() Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 09/34] mm, slub: return slab page from get_partial() and set c->page afterwards Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 10/34] mm, slub: restructure new page checks in ___slab_alloc() Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 11/34] mm, slub: simplify kmem_cache_cpu and tid setup Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 12/34] mm, slub: move disabling/enabling irqs to ___slab_alloc() Vlastimil Babka
2021-07-06 4:38 ` Mike Galbraith
2021-06-09 11:38 ` [RFC v2 13/34] mm, slub: do initial checks in ___slab_alloc() with irqs enabled Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 14/34] mm, slub: move disabling irqs closer to get_partial() in ___slab_alloc() Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 15/34] mm, slub: restore irqs around calling new_slab() Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 16/34] mm, slub: validate slab from partial list or page allocator before making it cpu slab Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 17/34] mm, slub: check new pages with restored irqs Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 18/34] mm, slub: stop disabling irqs around get_partial() Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 19/34] mm, slub: move reset of c->page and freelist out of deactivate_slab() Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 20/34] mm, slub: make locking in deactivate_slab() irq-safe Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 21/34] mm, slub: call deactivate_slab() without disabling irqs Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 22/34] mm, slub: move irq control into unfreeze_partials() Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 23/34] mm, slub: discard slabs in unfreeze_partials() without irqs disabled Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 24/34] mm, slub: detach whole partial list at once in unfreeze_partials() Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 25/34] mm, slub: detach percpu partial list in unfreeze_partials() using this_cpu_cmpxchg() Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 26/34] mm, slub: only disable irq with spin_lock in __unfreeze_partials() Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 27/34] mm, slub: don't disable irqs in slub_cpu_dead() Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 28/34] mm, slab: make flush_slab() possible to call with irqs enabled Vlastimil Babka
2021-06-09 11:38 ` [RFC v2 29/34] mm: slub: Move flush_cpu_slab() invocations __free_slab() invocations out of IRQ context Vlastimil Babka
2021-06-09 22:29 ` Cyrill Gorcunov
2021-06-10 8:32 ` Vlastimil Babka
2021-06-10 8:36 ` Cyrill Gorcunov
2021-06-09 11:38 ` [RFC v2 30/34] mm: slub: Make object_map_lock a raw_spinlock_t Vlastimil Babka
2021-06-09 11:39 ` [RFC v2 31/34] mm, slub: optionally save/restore irqs in slab_[un]lock()/ Vlastimil Babka
2021-07-02 12:17 ` Sebastian Andrzej Siewior
2021-06-09 11:39 ` [RFC v2 32/34] mm, slub: make slab_lock() disable irqs with PREEMPT_RT Vlastimil Babka
2021-06-09 11:39 ` [RFC v2 33/34] mm, slub: use migrate_disable() on PREEMPT_RT Vlastimil Babka
2021-06-14 11:07 ` Vlastimil Babka
2021-06-14 11:16 ` Sebastian Andrzej Siewior
2021-06-14 11:33 ` Vlastimil Babka
2021-06-14 12:54 ` Vlastimil Babka
2021-06-14 14:01 ` Sebastian Andrzej Siewior
2021-06-09 11:39 ` [RFC v2 34/34] mm, slub: convert kmem_cpu_slab protection to local_lock Vlastimil Babka
2021-06-14 9:49 ` [RFC v2 00/34] SLUB: reduce irq disabled scope and make it RT compatible Mel Gorman
2021-06-14 11:31 ` Mel Gorman
2021-06-14 11:10 ` Vlastimil Babka
2021-07-02 18:29 ` Sebastian Andrzej Siewior
2021-07-02 20:25 ` Vlastimil Babka
2021-07-29 13:49 ` Sebastian Andrzej Siewior
2021-07-29 14:17 ` Vlastimil Babka
2021-07-29 14:37 ` Sebastian Andrzej Siewior
2021-07-03 7:24 ` Mike Galbraith [this message]
2021-07-03 15:47 ` Mike Galbraith
2021-07-04 5:37 ` Mike Galbraith
2021-07-18 7:41 ` Vlastimil Babka
2021-07-18 8:29 ` Mike Galbraith
2021-07-18 12:09 ` Mike Galbraith
2021-07-05 16:00 ` Mike Galbraith
2021-07-06 17:56 ` Mike Galbraith
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