linux-kernel - Re: [PATCH v6 6/6] zsmalloc: Implement writeback mechanism for zsmalloc

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Message-ID: <Y3wofgb32j9z8Im2@google.com>
Date:   Tue, 22 Nov 2022 10:40:14 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Nhat Pham <nphamcs@...il.com>
Cc:     akpm@...ux-foundation.org, hannes@...xchg.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, minchan@...nel.org,
        ngupta@...are.org, senozhatsky@...omium.org, sjenning@...hat.com,
        ddstreet@...e.org, vitaly.wool@...sulko.com
Subject: Re: [PATCH v6 6/6] zsmalloc: Implement writeback mechanism for
 zsmalloc

On (22/11/18 16:15), Nhat Pham wrote:
> +static int zs_reclaim_page(struct zs_pool *pool, unsigned int retries);
> +
> +static int zs_zpool_shrink(void *pool, unsigned int pages,
> +			unsigned int *reclaimed)
> +{
> +	unsigned int total = 0;
> +	int ret = -EINVAL;
> +
> +	while (total < pages) {
> +		ret = zs_reclaim_page(pool, 8);

Just curious why 8 retries and how was 8 picked?

> +		if (ret < 0)
> +			break;
> +		total++;
> +	}
> +
> +	if (reclaimed)
> +		*reclaimed = total;
> +
> +	return ret;
> +}