Re: [PATCH v6 6/7] mm/mglru: add lruvec_gen_size() helper

[Barry Song]

On Tue, Nov 3, 2026 at 10:57 AM Ridong Chen <ridong.chen@xxxxxxxxx> wrote:
>
> From: Ridong Chen <chenridong@xxxxxxxxxx>
>
> The number of pages of a given type in a generation is computed by
> summing lrugen->nr_pages[gen][type][] over all zones and clamping each
> per-zone counter to >= 0, since the counters are updated locklessly and
> can transiently go negative. This loop is open-coded in
> lruvec_evictable_size() and in the debugfs lru_gen output.
>
> Add lruvec_gen_size() to compute it from a seq, and convert both users.
> Put it in mm/vmscan.h so that the vmscan tracepoints, which include that
> header, can use it as well.
> An upcoming tracepoint and the MGLRU swappiness rework will also use it.
>
> No functional change.
>
> Suggested-by: Barry Song <baohua@xxxxxxxxxx>
> Signed-off-by: Ridong Chen <chenridong@xxxxxxxxxx>
> ---

Reviewed-by: Barry Song <baohua@xxxxxxxxxx>