From: Hao Li <hao.li@linux.dev>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: Harry Yoo <harry.yoo@oracle.com>,
Petr Tesarik <ptesarik@suse.com>,
Christoph Lameter <cl@gentwo.org>,
David Rientjes <rientjes@google.com>,
Roman Gushchin <roman.gushchin@linux.dev>,
Andrew Morton <akpm@linux-foundation.org>,
Uladzislau Rezki <urezki@gmail.com>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Suren Baghdasaryan <surenb@google.com>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Alexei Starovoitov <ast@kernel.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-rt-devel@lists.linux.dev, bpf@vger.kernel.org,
kasan-dev@googlegroups.com,
kernel test robot <oliver.sang@intel.com>,
stable@vger.kernel.org, "Paul E. McKenney" <paulmck@kernel.org>
Subject: Re: [PATCH v4 00/22] slab: replace cpu (partial) slabs with sheaves
Date: Thu, 29 Jan 2026 23:18:54 +0800 [thread overview]
Message-ID: <imzzlzuzjmlkhxc7hszxh5ba7jksvqcieg5rzyryijkkdhai5q@l2t4ye5quozb> (raw)
In-Reply-To: <20260123-sheaves-for-all-v4-0-041323d506f7@suse.cz>
Hi Vlastimil,
I conducted a detailed performance evaluation of the each patch on my setup.
During my tests, I observed two points in the series where performance
regressions occurred:
Patch 10: I noticed a ~16% regression in my environment. My hypothesis is
that with this patch, the allocation fast path bypasses the percpu partial
list, leading to increased contention on the node list.
Patch 12: This patch seems to introduce an additional ~9.7% regression. I
suspect this might be because the free path also loses buffering from the
percpu partial list, further exacerbating node list contention.
These are the only two patches in the series where I observed noticeable
regressions. The rest of the patches did not show significant performance
changes in my tests.
I hope these test results are helpful.
--
Thanks,
Hao
next prev parent reply other threads:[~2026-01-29 15:19 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-23 6:52 Vlastimil Babka
2026-01-23 6:52 ` [PATCH v4 01/22] mm/slab: add rcu_barrier() to kvfree_rcu_barrier_on_cache() Vlastimil Babka
2026-01-27 16:08 ` Liam R. Howlett
2026-01-23 6:52 ` [PATCH v4 02/22] mm/slab: fix false lockdep warning in __kfree_rcu_sheaf() Vlastimil Babka
2026-01-23 12:03 ` Sebastian Andrzej Siewior
2026-01-24 10:58 ` Harry Yoo
2026-01-23 6:52 ` [PATCH v4 03/22] slab: add SLAB_CONSISTENCY_CHECKS to SLAB_NEVER_MERGE Vlastimil Babka
2026-01-23 6:52 ` [PATCH v4 04/22] mm/slab: move and refactor __kmem_cache_alias() Vlastimil Babka
2026-01-27 16:17 ` Liam R. Howlett
2026-01-27 16:59 ` Vlastimil Babka
2026-01-23 6:52 ` [PATCH v4 05/22] mm/slab: make caches with sheaves mergeable Vlastimil Babka
2026-01-27 16:23 ` Liam R. Howlett
2026-01-23 6:52 ` [PATCH v4 06/22] slab: add sheaves to most caches Vlastimil Babka
2026-01-26 6:36 ` Hao Li
2026-01-26 8:39 ` Vlastimil Babka
2026-01-26 13:59 ` Breno Leitao
2026-01-27 16:34 ` Liam R. Howlett
2026-01-27 17:01 ` Vlastimil Babka
2026-01-29 7:24 ` Zhao Liu
2026-01-29 8:21 ` Vlastimil Babka
2026-01-30 7:15 ` Zhao Liu
2026-02-04 18:01 ` Vlastimil Babka
2026-01-23 6:52 ` [PATCH v4 07/22] slab: introduce percpu sheaves bootstrap Vlastimil Babka
2026-01-26 6:13 ` Hao Li
2026-01-26 8:42 ` Vlastimil Babka
2026-01-27 17:31 ` Liam R. Howlett
2026-01-23 6:52 ` [PATCH v4 08/22] slab: make percpu sheaves compatible with kmalloc_nolock()/kfree_nolock() Vlastimil Babka
2026-01-23 18:05 ` Alexei Starovoitov
2026-01-27 17:36 ` Liam R. Howlett
2026-01-29 8:25 ` Vlastimil Babka
2026-01-23 6:52 ` [PATCH v4 09/22] slab: handle kmalloc sheaves bootstrap Vlastimil Babka
2026-01-27 18:30 ` Liam R. Howlett
2026-01-23 6:52 ` [PATCH v4 10/22] slab: add optimized sheaf refill from partial list Vlastimil Babka
2026-01-26 7:12 ` Hao Li
2026-01-29 7:43 ` Harry Yoo
2026-01-29 8:29 ` Vlastimil Babka
2026-01-27 20:05 ` Liam R. Howlett
2026-01-29 8:01 ` Harry Yoo
2026-01-23 6:52 ` [PATCH v4 11/22] slab: remove cpu (partial) slabs usage from allocation paths Vlastimil Babka
2026-01-23 18:17 ` Alexei Starovoitov
2026-01-23 6:52 ` [PATCH v4 12/22] slab: remove SLUB_CPU_PARTIAL Vlastimil Babka
2026-01-23 6:52 ` [PATCH v4 13/22] slab: remove the do_slab_free() fastpath Vlastimil Babka
2026-01-23 18:15 ` Alexei Starovoitov
2026-01-23 6:52 ` [PATCH v4 14/22] slab: remove defer_deactivate_slab() Vlastimil Babka
2026-01-23 17:31 ` Alexei Starovoitov
2026-01-23 6:52 ` [PATCH v4 15/22] slab: simplify kmalloc_nolock() Vlastimil Babka
2026-01-23 6:52 ` [PATCH v4 16/22] slab: remove struct kmem_cache_cpu Vlastimil Babka
2026-01-23 6:52 ` [PATCH v4 17/22] slab: remove unused PREEMPT_RT specific macros Vlastimil Babka
2026-01-23 6:52 ` [PATCH v4 18/22] slab: refill sheaves from all nodes Vlastimil Babka
2026-01-27 14:28 ` Mateusz Guzik
2026-01-27 22:04 ` Vlastimil Babka
2026-01-29 9:16 ` Harry Yoo
2026-01-23 6:52 ` [PATCH v4 19/22] slab: update overview comments Vlastimil Babka
2026-01-23 6:52 ` [PATCH v4 20/22] slab: remove frozen slab checks from __slab_free() Vlastimil Babka
2026-01-29 7:16 ` Harry Yoo
2026-01-23 6:52 ` [PATCH v4 21/22] mm/slub: remove DEACTIVATE_TO_* stat items Vlastimil Babka
2026-01-29 7:21 ` Harry Yoo
2026-01-23 6:53 ` [PATCH v4 22/22] mm/slub: cleanup and repurpose some " Vlastimil Babka
2026-01-29 7:40 ` Harry Yoo
2026-01-29 15:18 ` Hao Li [this message]
2026-01-29 15:28 ` [PATCH v4 00/22] slab: replace cpu (partial) slabs with sheaves Vlastimil Babka
2026-01-29 16:06 ` Hao Li
2026-01-29 16:44 ` Liam R. Howlett
2026-01-30 4:38 ` Hao Li
2026-01-30 4:50 ` Hao Li
2026-01-30 6:17 ` Hao Li
2026-02-04 18:02 ` Vlastimil Babka
2026-02-04 18:24 ` Christoph Lameter (Ampere)
2026-02-06 16:44 ` Vlastimil Babka
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