linux-kernel - Re: [PATCH v3] vmscan: add a vmscan event for reclaim

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Message-ID: <a2db26dd-b6cd-43ed-a6f0-1dcc22e07d48@suse.cz>
Date: Thu, 17 Oct 2024 11:22:29 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: Jaewon Kim <jaewon31.kim@...sung.com>, sj@...nel.org, minchan@...nel.org,
 kaleshsingh@...gle.com, akpm@...ux-foundation.org
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, jaewon31.kim@...il.com
Subject: Re: [PATCH v3] vmscan: add a vmscan event for reclaim_pages

On 10/16/24 16:32, Jaewon Kim wrote:
> The reclaim_folio_list uses a dummy reclaim_stat and is not being
> used. To know the memory stat, add a new trace event. This is useful how
> how many pages are not reclaimed or why.
> 
> This is an example.
> mm_vmscan_reclaim_pages: nid=0 nr_scanned=112 nr_reclaimed=112 nr_dirty=0 nr_writeback=0 nr_congested=0 nr_immediate=0 nr_activate_anon=0 nr_activate_file=0 nr_ref_keep=0 nr_unmap_fail=0
> 
> Currenlty reclaim_folio_list is only called by reclaim_pages, and
> reclaim_pages is used by damon and madvise. In the latest Android,
> reclaim_pages is also used by shmem to reclaim all pages in a
> address_space.
> 
> Signed-off-by: Jaewon Kim <jaewon31.kim@...sung.com>

Acked-by: Vlastimil Babka <vbabka@...e.cz>