linux-kernel - Re: [PATCH 2/5] mm: remove zone_lru_lock() function access ->lru

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Message-ID: <d7bdecc2-5e64-a3a6-e62c-3feec00972f2@suse.cz>
Date:   Mon, 25 Feb 2019 13:10:48 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Rik van Riel <riel@...riel.com>,
        Mel Gorman <mgorman@...hsingularity.net>
Subject: Re: [PATCH 2/5] mm: remove zone_lru_lock() function access ->lru_lock
 directly

s/function/and/ on the subject?

On 2/22/19 6:43 PM, Andrey Ryabinin wrote:
> We have common pattern to access lru_lock from a page pointer:
> 	zone_lru_lock(page_zone(page))
> 
> Which is silly, because it unfolds to this:
> 	&NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)]->zone_pgdat->lru_lock
> while we can simply do
> 	&NODE_DATA(page_to_nid(page))->lru_lock

Heh, well spotted.

> 
> Remove zone_lru_lock() function, since it's only complicate things.
> Use 'page_pgdat(page)->lru_lock' pattern instead.
> 
> Signed-off-by: Andrey Ryabinin <aryabinin@...tuozzo.com>

Acked-by: Vlastimil Babka <vbabka@...e.cz>

Thanks.