linux-kernel - Re: [PATCH -next v3 2/2] mm: vmscan: add new event to trace shrink lru

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Message-ID: <CAOUHufZXX9M=sTkqxy=Pf2c298w7ha-SzF+1g9_HWcNkLVM9oA@mail.gmail.com>
Date:   Wed, 13 Dec 2023 20:59:18 -0700
From:   Yu Zhao <yuzhao@...gle.com>
To:     cuibixuan@...o.com
Cc:     akpm@...ux-foundation.org, mm-commits@...r.kernel.org,
        rostedt@...dmis.org, mhiramat@...nel.org,
        mathieu.desnoyers@...icios.com, opensource.kernel@...o.com,
        Linux-MM <linux-mm@...ck.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next v3 2/2] mm: vmscan: add new event to trace shrink lru

On Wed, Dec 13, 2023 at 6:35 PM Bixuan Cui <cuibixuan@...o.com> wrote:
>
> From: cuibixuan <cuibixuan@...o.com>
>
> Add a new event to calculate the shrink_inactive_list()/shrink_active_list()
> execution time.
>
> Example of output:
>          kswapd0-103     [007] .....  1098.353020: mm_vmscan_lru_shrink_active_start: nid=0
>          kswapd0-103     [007] .....  1098.353040: mm_vmscan_lru_shrink_active_end: nid=0 nr_taken=32 nr_active=0 nr_deactivated=32 nr_referenced=0 priority=6 flags=RECLAIM_WB_FILE|RECLAIM_WB_ASYNC
>          kswapd0-103     [007] .....  1098.353040: mm_vmscan_lru_shrink_inactive_start: nid=0
>          kswapd0-103     [007] .....  1098.353094: mm_vmscan_lru_shrink_inactive_end: nid=0 nr_scanned=32 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=32 nr_unmap_fail=0 priority=6 flags=RECLAIM_WB_ANON|RECLAIM_WB_ASYNC
>          kswapd0-103     [007] .....  1098.353094: mm_vmscan_lru_shrink_inactive_start: nid=0
>          kswapd0-103     [007] .....  1098.353162: mm_vmscan_lru_shrink_inactive_end: nid=0 nr_scanned=32 nr_reclaimed=21 nr_dirty=0 nr_writeback=0 nr_congested=0 nr_immediate=0 nr_activate_anon=0 nr_activate_file=0 nr_ref_keep=11 nr_unmap_fail=0 priority=6 flags=RECLAIM_WB_FILE|RECLAIM_WB_ASYNC
>
> Signed-off-by: Bixuan Cui <cuibixuan@...o.com>

NAK.

A _start should always be paired with an _end unless there is a good
reason not to.

mm-commits@ is the wrong mailing list to submit MM patches.

Is the build error Andrew pointed out earlier fixed? If so, where is
it credited to him?