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

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Date:   Wed, 23 Nov 2022 08:30:44 -0800
From:   Nhat Pham <nphamcs@...il.com>
To:     senozhatsky@...omium.org
Cc:     hannes@...xchg.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, minchan@...nel.org,
        ngupta@...are.org, akpm@...ux-foundation.org, sjenning@...hat.com,
        ddstreet@...e.org, vitaly.wool@...sulko.com
Subject: Re: [PATCH v6 6/6] zsmalloc: Implement writeback mechanism for zsmalloc

Thanks for the comments, Sergey!

> A nit: we usually call get_first_page() in such cases.

I'll use get_first_page() here in v7.

> We probably better to cond_resched() somewhere here. Or in zs_zpool_shrink()
> loop.

I'll put it right after releasing the pool's lock in the retry loop:

		/* Lock out object allocations and object compaction */
		remove_zspage(class, zspage, fullness);

		spin_unlock(&pool->lock);
		cond_resched();

		/* Lock backing pages into place */
		lock_zspage(zspage);

This will also appear in v7. In the meantime, please feel free to discuss all
the patches - I'll try to batch the changes to minimize the churning.