From: Mel Gorman <mgorman@techsingularity.net>
To: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
akpm@linux-foundation.org, baolin.wang@linux.alibaba.com,
david@redhat.com, willy@infradead.org
Subject: Re: [PATCH v2 3/7] mm/compaction: correctly return failure with bogus compound_order in strict mode
Date: Tue, 29 Aug 2023 10:39:09 +0100 [thread overview]
Message-ID: <20230829093909.4hpria3qtouvdv6a@techsingularity.net> (raw)
In-Reply-To: <20230826153617.4019189-4-shikemeng@huaweicloud.com>
On Sat, Aug 26, 2023 at 11:36:13PM +0800, Kemeng Shi wrote:
> In strict mode, we should return 0 if there is any hole in pageblock. If
> we successfully isolated pages at beginning at pageblock and then have a
> bogus compound_order outside pageblock in next page. We will abort search
> loop with blockpfn > end_pfn. Although we will limit blockpfn to end_pfn,
> we will treat it as a successful isolation in strict mode as blockpfn is
> not < end_pfn and return partial isolated pages. Then
> isolate_freepages_range may success unexpectly with hole in isolated
> range.
>
> Fixes: 9fcd6d2e052ee ("mm, compaction: skip compound pages by order in free scanner")
> Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Modify the (likely(order <= MAX_ORDER)) block to avoid ever updating
blockpfn past the end of the pageblock. Then remove the second redundant
check.
--
Mel Gorman
SUSE Labs
next prev parent reply other threads:[~2023-08-29 9:39 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-26 15:36 [PATCH v2 0/7] Fixes and cleanups to compaction Kemeng Shi
2023-08-26 15:36 ` [PATCH v2 1/7] mm/compaction: use correct list in move_freelist_{head}/{tail} Kemeng Shi
2023-08-29 9:03 ` Mel Gorman
2023-08-26 15:36 ` [PATCH v2 2/7] mm/compaction: call list_is_{first}/{last} more intuitively " Kemeng Shi
2023-08-29 9:18 ` Mel Gorman
2023-08-26 15:36 ` [PATCH v2 7/7] mm/compaction: factor out code to test if we should run compaction for target order Kemeng Shi
2023-08-29 3:48 ` Baolin Wang
2023-08-30 6:28 ` Kemeng Shi
2023-08-29 3:54 ` Matthew Wilcox
2023-08-30 6:45 ` Kemeng Shi
[not found] ` <20230826153617.4019189-4-shikemeng@huaweicloud.com>
2023-08-29 3:27 ` [PATCH v2 3/7] mm/compaction: correctly return failure with bogus compound_order in strict mode Baolin Wang
2023-08-29 9:39 ` Mel Gorman [this message]
2023-08-30 6:50 ` Kemeng Shi
[not found] ` <20230826153617.4019189-5-shikemeng@huaweicloud.com>
2023-08-29 15:01 ` [PATCH v2 4/7] mm/compaction: simplify pfn iteration in isolate_freepages_range Mel Gorman
2023-08-30 7:02 ` Kemeng Shi
[not found] ` <20230826153617.4019189-6-shikemeng@huaweicloud.com>
2023-08-29 15:05 ` [PATCH v2 5/7] mm/compaction: remove repeat compact_blockskip_flush check in reset_isolation_suitable Mel Gorman
2023-08-30 7:07 ` Kemeng Shi
[not found] ` <20230826153617.4019189-7-shikemeng@huaweicloud.com>
2023-08-29 3:28 ` [PATCH v2 6/7] mm/compaction: improve comment of is_via_compact_memory Baolin Wang
2023-08-29 15:06 ` Mel Gorman
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