linux-kernel - Re: [PATCH -next v2 0/7] limit the number of plugged bio

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Date:   Fri, 12 May 2023 17:42:59 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     Yu Kuai <yukuai1@...weicloud.com>, song@...nel.org, akpm@...l.org,
        neilb@...e.de
Cc:     linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
        yi.zhang@...wei.com, yangerkun@...wei.com,
        "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH -next v2 0/7] limit the number of plugged bio

Hi,

在 2023/04/26 16:20, Yu Kuai 写道:
> From: Yu Kuai <yukuai3@...wei.com>
> 
> Changes in v2:
>   - remove the patch to rename raid1-10.c
> 
> This patchset tries to limit the number of plugged bio for raid1 and
> raid10, which is done in the last patch, other patches are some refactor
> and optimizations.
> 
> This patchset is tested with a new test [1], this test triggers dirty
> pages writeback for 10s, and in the meantime checks disk inflight.
> 
> Before this patchset, test will fail because inflight exceed threshold
> (threshold is set to 4096 in the test, in theory this can be mutch
>   greater as long as there are enough dirty pages and memory).
> 
> After this patchset, inflight is within 96 (MAX_PLUG_BIO * copies).
> 
> [1] https://lore.kernel.org/linux-raid/20230426073447.1294916-1-yukuai1@huaweicloud.com/

Friendly ping...

Thanks,
Kuai
> 
> Yu Kuai (7):
>    md/raid10: prevent soft lockup while flush writes
>    md/raid1-10: factor out a helper to add bio to plug
>    md/raid1-10: factor out a helper to submit normal write
>    md/raid1-10: submit write io directly if bitmap is not enabled
>    md/md-bitmap: add a new helper to unplug bitmap asynchrously
>    md/raid1-10: don't handle pluged bio by daemon thread
>    md/raid1-10: limit the number of plugged bio
> 
>   drivers/md/md-bitmap.c | 55 +++++++++++++++++++++++++++++++++----
>   drivers/md/md-bitmap.h | 10 +++++++
>   drivers/md/raid1-10.c  | 62 ++++++++++++++++++++++++++++++++++++++++++
>   drivers/md/raid1.c     | 29 ++++----------------
>   drivers/md/raid10.c    | 47 +++++++-------------------------
>   5 files changed, 136 insertions(+), 67 deletions(-)
>