linux-kernel - Re: [PATCH 1/2] tracing: mm: multigen-lru: fix mglru trace

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Message-ID: <CAOUHufbc9j-6yfcm_4h_qD5L1oq6KRVXxA1u+mx0dXBqtghjYQ@mail.gmail.com>
Date:   Wed, 18 Oct 2023 10:28:25 -0600
From:   Yu Zhao <yuzhao@...gle.com>
To:     Huan Yang <link@...o.com>, Jaewon Kim <jaewon31.kim@...sung.com>,
        Kalesh Singh <kaleshsingh@...gle.com>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>, linux-kernel@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, linux-mm@...ck.org,
        bpf@...r.kernel.org, opensource.kernel@...o.com
Subject: Re: [PATCH 1/2] tracing: mm: multigen-lru: fix mglru trace

On Wed, Oct 18, 2023 at 2:22 AM Huan Yang <link@...o.com> wrote:
>
> This patch add two reclaim stat:
> nr_promote: nr_pages shrink before promote by folio_update_gen.
> nr_demote: nr_pages NUMA demotion passed.

The above isn't specific to MLGRU, so they should be in a separate patchset.

> And then, use correct nr_scanned which evict_folios passed into
> trace_mm_vmscan_lru_shrink_inactive.
>
> Mistake info like this:
> ```
> kswapd0-89    [000]    64.887613: mm_vmscan_lru_shrink_inactive:
> nid=0 nr_scanned=64 nr_reclaimed=0 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 priority=4
> flags=RECLAIM_WB_FILE|RECLAIM_WB_ASYNC
> ```
> Correct info like this:
> ```
>  <...>-9041  [006]    43.738481: mm_vmscan_lru_shrink_inactive:
>  nid=0 nr_scanned=13 nr_reclaimed=0 nr_dirty=0 nr_writeback=0
>  nr_congested=0 nr_immediate=0 nr_activate_anon=9 nr_activate_file=0
>  nr_ref_keep=0 nr_unmap_fail=0 nr_promote=4 nr_demote=0 priority=12
>  flags=RECLAIM_WB_ANON|RECLAIM_WB_ASYNC
> ```

Adding Jaewon & Kalesh to take a look.