linux-kernel - Re: [PATCH] blk-wbt: do not throttle swap write on processes other than kswapd

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Message-ID: <YvUNj9cTFhvHKsF4@infradead.org>
Date:   Thu, 11 Aug 2022 07:09:19 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Hongchen Zhang <zhanghongchen@...ngson.cn>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] blk-wbt: do not throttle swap write on processes other
 than kswapd

On Thu, Aug 11, 2022 at 07:32:25PM +0800, Hongchen Zhang wrote:
> +		if (current_is_kswapd() ||
> +		    (bio->bi_end_io != end_swap_bio_write))
> +			flags |= WBT_TRACKED;

Why can't this just use REQ_SWAP instead of doing strange poking into
deep kernel internals?