linux-kernel - Re: [RFC PATCH v2 1/7] block: Extand commit

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Date:   Tue, 12 May 2020 15:55:01 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Sagi Grimberg <sagi@...mberg.me>
Cc:     Baolin Wang <baolin.wang7@...il.com>,
        Christoph Hellwig <hch@...radead.org>, axboe@...nel.dk,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Arnd Bergmann <arnd@...db.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Paolo Valente <paolo.valente@...aro.org>,
        Orson Zhai <orsonzhai@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        linux-block <linux-block@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v2 1/7] block: Extand commit_rqs() to do batch
 processing

On Mon, May 11, 2020 at 11:26:07PM -0700, Sagi Grimberg wrote:
> 
> > > devices will benefit from the batching so maybe the flag needs to be
> > > inverted? BLK_MQ_F_DONT_BATCHING_SUBMISSION?
> > 
> > Actually I'd rather to not add any flag, and we may use some algorithm
> > (maybe EWMA or other intelligent stuff, or use hctx->dispatch_busy directly)
> > to figure out one dynamic batching number which is used to dequeue requests
> > from scheduler or sw queue.
> > 
> > Then just one single dispatch io code path is enough.
> 
> Sounds good to me, do you plan to submit a patchset?
> 

Yeah, I am working on that.


Thanks,
Ming