From: Andrew Morton <akpm@linux-foundation.org>
To: Hongling Zeng <zenghongling@kylinos.cn>
Cc: dennis@kernel.org, tj@kernel.org, cl@gentwo.org,
linux-mm@kvack.org, kernel@vger.kernel.org,
zhongling0719@126.com
Subject: Re: [PATCH RESEND v2] mm/percpu-internal.h: optimise pcpu_chunk struct to save memory
Date: Tue, 12 May 2026 15:03:40 -0700 [thread overview]
Message-ID: <20260512150340.c8ae97f9299918a1f12f3e7d@linux-foundation.org> (raw)
In-Reply-To: <20260511070309.44044-1-zenghongling@kylinos.cn>
On Mon, 11 May 2026 15:03:09 +0800 Hongling Zeng <zenghongling@kylinos.cn> wrote:
> Using pahole, we can see that there are some padding holes
> in the current pcpu_chunk structure,Adjusting the layout of pcpu_chunk
> can reduce these holes,decreasing its size from 192 bytes to 128 bytes
> and eliminating a wasted cache line.
>
> With allmodconfig (CONFIG_PERCPU_STATS + NEED_PCPUOBJ_EXT)
> Before:
> /* size: 256, cachelines: 4, members: 19 */
>
> After:
> /* size: 192, cachelines: 3, members: 19 */
Thanks, I'll add this to mm.git for testing, but I'm not planning on
taking it further until Dennis has taken a look.
next prev parent reply other threads:[~2026-05-12 22:03 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-11 7:03 [PATCH RESEND v2] mm/percpu-internal.h: optimise pcpu_chunk struct to save memory Hongling Zeng
2026-05-12 22:03 ` Andrew Morton [this message]
2026-05-13 8:23 ` Dennis Zhou
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