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    SubjectRe: [v5 PATCH 01/11] mm: vmscan: use nid from shrink_control for tracepoint
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    On 1/28/21 12:33 AM, Yang Shi wrote:
    > The tracepoint's nid should show what node the shrink happens on, the start tracepoint
    > uses nid from shrinkctl, but the nid might be set to 0 before end tracepoint if the
    > shrinker is not NUMA aware, so the traceing log may show the shrink happens on one
    > node but end up on the other node. It seems confusing. And the following patch
    > will remove using nid directly in do_shrink_slab(), this patch also helps cleanup
    > the code.
    >
    > Signed-off-by: Yang Shi <shy828301@gmail.com>

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

    > ---
    > mm/vmscan.c | 2 +-
    > 1 file changed, 1 insertion(+), 1 deletion(-)
    >
    > diff --git a/mm/vmscan.c b/mm/vmscan.c
    > index b1b574ad199d..b512dd5e3a1c 100644
    > --- a/mm/vmscan.c
    > +++ b/mm/vmscan.c
    > @@ -535,7 +535,7 @@ static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,
    > else
    > new_nr = atomic_long_read(&shrinker->nr_deferred[nid]);
    >
    > - trace_mm_shrink_slab_end(shrinker, nid, freed, nr, new_nr, total_scan);
    > + trace_mm_shrink_slab_end(shrinker, shrinkctl->nid, freed, nr, new_nr, total_scan);
    > return freed;
    > }
    >
    >

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