linux-kernel - Re: [PATCH 00/13] mm, swap: rework of swap allocator locks

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Message-Id: <20241023032744.84a6a9f6f5f1e3aa1fe5f0d9@linux-foundation.org>
Date: Wed, 23 Oct 2024 03:27:44 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Kairui Song <kasong@...cent.com>
Cc: Kairui Song <ryncsn@...il.com>, linux-mm@...ck.org, Chris Li
 <chrisl@...nel.org>, Barry Song <v-songbaohua@...o.com>, Ryan Roberts
 <ryan.roberts@....com>, Hugh Dickins <hughd@...gle.com>, Yosry Ahmed
 <yosryahmed@...gle.com>, "Huang, Ying" <ying.huang@...el.com>, Tim Chen
 <tim.c.chen@...ux.intel.com>, Nhat Pham <nphamcs@...il.com>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/13] mm, swap: rework of swap allocator locks

On Wed, 23 Oct 2024 03:24:38 +0800 Kairui Song <ryncsn@...il.com> wrote:

> After this series, lock contention on si->lock is nearly unobservable
> with `perf lock` with the same test above :
> 
>   contended   total wait     max wait     avg wait         type   caller
>   ... snip ...
>          91    204.62 us      4.51 us      2.25 us     spinlock   cluster_move+0x2e
>   ... snip ...
>          47    125.62 us      4.47 us      2.67 us     spinlock   cluster_move+0x2e
>   ... snip ...
>          23     63.15 us      3.95 us      2.74 us     spinlock   cluster_move+0x2e
>   ... snip ...
>          17     41.26 us      4.58 us      2.43 us     spinlock   cluster_isolate_lock+0x1d
>   ... snip ...

Were any overall runtime benefits observed?