linux-kernel - Re: [PATCH -V2 4/7] migrate_pages(): fix failure counting for THP subpages retrying

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Date:   Mon, 11 Jul 2022 14:13:04 +0200
From:   Oscar Salvador <osalvador@...e.de>
To:     Huang Ying <ying.huang@...el.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Zi Yan <ziy@...dia.com>, Yang Shi <shy828301@...il.com>
Subject: Re: [PATCH -V2 4/7] migrate_pages(): fix failure counting for THP
 subpages retrying

On Mon, Jul 11, 2022 at 04:49:45PM +0800, Huang Ying wrote:
> If THP is failed to be migrated for -ENOSYS and -ENOMEM, the THP will
> be split into thp_split_pages, and after other pages are migrated,
> pages in thp_split_pages will be migrated with no_subpage_counting ==
> true, because its failure have been counted already.  If some pages in
> thp_split_pages are retried during migration, we should not count
> their failure if no_subpage_counting == true too.  This is done this
> patch to fix the failure counting for THP subpages retrying.
> 
> Signed-off-by: "Huang, Ying" <ying.huang@...el.com>
> Fixes: 5984fabb6e82 ("mm: move_pages: report the number of non-attempted pages")
> Reviewed-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
> Cc: Zi Yan <ziy@...dia.com>
> Cc: Yang Shi <shy828301@...il.com>

Reviewed-by: Oscar Salvador <osalvador@...e.de>


-- 
Oscar Salvador
SUSE Labs