linux-kernel - Re: [PATCH RESEND v2 5/5] sbitmap: correct wake_batch recalculation to avoid potential IO hung

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Message-ID: <f8df9153-eeff-f3ca-c4c2-2be0cf876298@huaweicloud.com>
Date:   Tue, 3 Jan 2023 10:12:17 +0800
From:   Kemeng Shi <shikemeng@...weicloud.com>
To:     Yu Kuai <yukuai1@...weicloud.com>, Jan Kara <jack@...e.cz>,
        Ming Lei <ming.lei@...hat.com>,
        "yukuai (C)" <yukuai3@...wei.com>
Cc:     axboe@...nel.dk, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, kbusch@...nel.org,
        Laibin Qiu <qiulaibin@...wei.com>
Subject: Re: [PATCH RESEND v2 5/5] sbitmap: correct wake_batch recalculation
 to avoid potential IO hung

Friendly ping...

on 12/26/2022 4:57 PM, Yu Kuai wrote:
> 在 2022/12/26 15:50, Yu Kuai 写道:
> 
>>> why using
>>> wake batch of 4 is safe for cards with say 32 tags in case active_users is
>>> currently 32. Because I don't see why that is correct either.
>>>
> 
> I see, you guys are worried that during the period that some hctx
> complete all it's not idle yet. It's right waiter might wait for
> other hctx to become idle to be awaken in this case. However, I'm
> not sure which way is better.
> 
> Ming, do you have any idea?
> 
> Thanks,
> Kuai
> 

-- 
Best wishes
Kemeng Shi