linux-kernel - Re: [PATCH 4/4] block/part_stat: add helper blk_account_io_merge

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Date:   Mon, 4 May 2020 07:06:11 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Cc:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH 4/4] block/part_stat: add helper
 blk_account_io_merge_bio()

On Mon, May 04, 2020 at 04:31:04PM +0300, Konstantin Khlebnikov wrote:
> Move non-"new_io" branch of blk_account_io_start() into separate function.
> Fix merge accounting for discards (they were counted as write merges).
> 
> Also blk_account_io_merge_bio() doesn't call update_io_ticks() unlike to
> blk_account_io_start(), there is no reason for that.
> 
> Signed-off-by: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>

Looks good,

Reviewed-by: Christoph Hellwig <hch@....de>

Nitpick below:

> +void blk_account_io_start(struct request *rq)
>  {
>  	struct hd_struct *part;
>  	int rw = rq_data_dir(rq);
>  
> +	if (blk_do_io_stat(rq)) {

part and rw probably should move inside this branch.