From: Breno Leitao <leitao@debian.org>
To: Andrew Morton <akpm@linux-foundation.org>,
David Hildenbrand <david@kernel.org>,
Lorenzo Stoakes <ljs@kernel.org>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Vlastimil Babka <vbabka@kernel.org>,
Mike Rapoport <rppt@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, kas@kernel.org,
shakeel.butt@linux.dev, usama.arif@linux.dev,
kernel-team@meta.com
Subject: Re: [PATCH] mm/vmstat: spread vmstat_update requeue across the stat interval
Date: Wed, 1 Apr 2026 07:47:19 -0700 [thread overview]
Message-ID: <ac0vfEGS6GrdHH8r@gmail.com> (raw)
In-Reply-To: <20260401-vmstat-v1-1-b68ce4a35055@debian.org>
On Wed, Apr 01, 2026 at 06:57:50AM -0700, Breno Leitao wrote:
> free_pcppages_bulk contention (KASAN):
> +--------------+----------+----------+
> | Metric | No fix | With fix |
> +--------------+----------+----------+
> | Contentions | 872 | 117 |
> | Total wait | 199.43ms | 80.76ms |
> | Max wait | 4.19ms | 35.76ms |
> +--------------+----------+----------+
>
> Results without KASAN:
>
> free_pcppages_bulk contention (no KASAN):
> +--------------+----------+----------+
> | Metric | No fix | With fix |
> +--------------+----------+----------+
> | Contentions | 240 | 133 |
> | Total wait | 34.01ms | 24.61ms |
> | Max wait | 965us | 1.35ms |
> +--------------+----------+----------+
Sorry, the Max wait time is inverted on both cases.
free_pcppages_bulk contention (KASAN):
+--------------+----------+----------+
| Metric | No fix | With fix |
+--------------+----------+----------+
| Contentions | 872 | 117 |
| Total wait | 199.43ms | 80.76ms |
| Max wait | 35.76ms | 4.19ms |
+--------------+----------+----------+
Results without KASAN:
free_pcppages_bulk contention (no KASAN):
+--------------+----------+----------+
| Metric | No fix | With fix |
+--------------+----------+----------+
| Contentions | 240 | 133 |
| Total wait | 34.01ms | 24.61ms |
| Max wait | 1.35ms | 965us |
+--------------+----------+----------+
next prev parent reply other threads:[~2026-04-01 14:47 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-01 13:57 [PATCH] mm/vmstat: spread vmstat_update requeue across the stat interval Breno Leitao
2026-04-01 14:25 ` Johannes Weiner
2026-04-01 14:39 ` Breno Leitao
2026-04-01 14:57 ` Johannes Weiner
2026-04-01 14:47 ` Breno Leitao [this message]
2026-04-01 15:01 ` Kiryl Shutsemau
2026-04-01 15:23 ` Usama Arif
2026-04-01 15:43 ` Breno Leitao
2026-04-01 15:50 ` Usama Arif
2026-04-01 15:52 ` Breno Leitao
2026-04-01 17:46 ` Vlastimil Babka (SUSE)
2026-04-02 12:40 ` Vlastimil Babka (SUSE)
2026-04-02 13:33 ` Breno Leitao
2026-04-02 12:43 ` Dmitry Ilvokhin
2026-04-02 7:18 ` Michal Hocko
2026-04-02 12:49 ` Matthew Wilcox
2026-04-02 13:26 ` Breno Leitao
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