linux-kernel - Re: [PATCH] block/psi: make PSI annotations of submit

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Date:   Wed, 16 Mar 2022 01:48:05 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     cgel.zte@...il.com
Cc:     axboe@...nel.dk, viro@...iv.linux.org.uk, hannes@...xchg.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, akpm@...ux-foundation.org,
        Yang Yang <yang.yang29@....com.cn>,
        Ran Xiaokai <ran.xiaokai@....com.cn>
Subject: Re: [PATCH] block/psi: make PSI annotations of submit_bio only work
 for file pages

> @@ -1035,8 +1035,9 @@ void __bio_add_page(struct bio *bio, struct page *page,
>  	bio->bi_iter.bi_size += len;
>  	bio->bi_vcnt++;
>  
> -	if (!bio_flagged(bio, BIO_WORKINGSET) && unlikely(PageWorkingset(page)))
> -		bio_set_flag(bio, BIO_WORKINGSET);
> +	if (!bio_flagged(bio, BIO_WORKINGSET_FILE) &&
> +	    unlikely(PageWorkingset(page)) && !PageSwapBacked(page))
> +		bio_set_flag(bio, BIO_WORKINGSET_FILE);

This needs to go out of the block I/O fast path, not grow even more
checks.