linux-kernel - Re: [PATCH v2] mm: show_mem: show number of zspages in show_free

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Message-ID: <60FFF867-F92B-4187-8AA5-40A91C3AD4A5@nvidia.com>
Date: Tue, 02 Sep 2025 12:01:27 -0400
From: Zi Yan <ziy@...dia.com>
To: Thadeu Lima de Souza Cascardo <cascardo@...lia.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
 Vlastimil Babka <vbabka@...e.cz>, Suren Baghdasaryan <surenb@...gle.com>,
 Michal Hocko <mhocko@...e.com>, Brendan Jackman <jackmanb@...gle.com>,
 Johannes Weiner <hannes@...xchg.org>, Minchan Kim <minchan@...nel.org>,
 Sergey Senozhatsky <senozhatsky@...omium.org>,
 Yosry Ahmed <yosry.ahmed@...ux.dev>, Nhat Pham <nphamcs@...il.com>,
 Chengming Zhou <chengming.zhou@...ux.dev>, SeongJae Park <sj@...nel.org>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, kernel-dev@...lia.com
Subject: Re: [PATCH v2] mm: show_mem: show number of zspages in
 show_free_areas

On 2 Sep 2025, at 8:49, Thadeu Lima de Souza Cascardo wrote:

> When OOM is triggered, it will show where the pages might be for each zone.
> When using zram or zswap, it might look like lots of pages are missing.
> After this patch, zspages are shown as below.
>
> [   48.792859] Node 0 DMA free:2812kB boost:0kB min:60kB low:72kB high:84kB reserved_highatomic:0KB free_highatomic:0KB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB zspages:11160kB present:15992kB managed:15360kB mlocked:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
> [   48.792962] lowmem_reserve[]: 0 956 956 956 956
> [   48.792988] Node 0 DMA32 free:3512kB boost:0kB min:3912kB low:4888kB high:5864kB reserved_highatomic:0KB free_highatomic:0KB active_anon:0kB inactive_anon:28kB active_file:8kB inactive_file:16kB unevictable:0kB writepending:0kB zspages:916780kB present:1032064kB managed:978944kB mlocked:0kB bounce:0kB free_pcp:500kB local_pcp:248kB free_cma:0kB
> [   48.793118] lowmem_reserve[]: 0 0 0 0 0
>
> Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...lia.com>
> ---
> v2:
> - fix build when CONFIG_ZSMALLOC is not enabled
> ---
>  mm/show_mem.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>

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

Best Regards,
Yan, Zi