Re: [PATCH mm-unstable v3 1/2] mm/vmscan: fix missing NR_ISOLATED counter update in MGLRU reclaim path

[Barry Song]

On Tue, Aug 18, 2026 at 8:49 PM Hui Zhu <hui.zhu@xxxxxxxxx> wrote:
>
> From: Hui Zhu <zhuhui@xxxxxxxxxx>
>
> MGLRU evict_folios() isolates folios from the LRU without updating
> the NR_ISOLATED_ANON/FILE counters, unlike the legacy
> shrink_inactive_list() path. This causes compaction's
> too_many_isolated() check to under-count isolated pages when MGLRU
> reclaim is active.
>
> Add NR_ISOLATED counter updates in evict_folios(): increment after
> isolate_folios() and decrement after all retry passes complete, using
> the existing nr_isolated which holds the original isolated count.
>
> Signed-off-by: Hui Zhu <zhuhui@xxxxxxxxxx>
> Reviewed-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
> ---

LGTM, thanks!

Reviewed-by: Barry Song <baohua@xxxxxxxxxx>