linux-kernel - Re: [PATCH v3 2/2] mm/show_mem: Add trylock while printing alloc info

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Message-ID: <087C9FD8-BEDD-4CF8-82DB-E3B909FEE321@nvidia.com>
Date: Wed, 03 Sep 2025 12:30:10 -0400
From: Zi Yan <ziy@...dia.com>
To: Yueyang Pan <pyyjason@...il.com>
Cc: Suren Baghdasaryan <surenb@...gle.com>,
 Andrew Morton <akpm@...ux-foundation.org>, Vlastimil Babka <vbabka@...e.cz>,
 Michal Hocko <mhocko@...e.com>, Brendan Jackman <jackmanb@...gle.com>,
 Johannes Weiner <hannes@...xchg.org>, Vishal Moola <vishal.moola@...il.com>,
 Shakeel Butt <shakeel.butt@...ux.dev>, Usama Arif <usamaarif642@...il.com>,
 linux-mm@...ck.org, kernel-team@...a.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] mm/show_mem: Add trylock while printing alloc info

On 3 Sep 2025, at 7:16, Yueyang Pan wrote:

> In production, show_mem() can be called concurrently from two
> different entities, for example one from oom_kill_process()
> another from __alloc_pages_slowpath from another kthread. This
> patch adds a spinlock and invokes trylock before printing out the
> kernel alloc info in show_mem(). This way two alloc info won't
> interleave with each other, which then makes parsing easier.
>
> Signed-off-by: Yueyang Pan <pyyjason@...il.com>
> ---
>  mm/show_mem.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>

Acked-by: Zi Yan <ziy@...dia.com>

Best Regards,
Yan, Zi