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mm: migrate: do not retry 10 times for the subpages of fail-to-migrate THP 

If THP is failed to migrate due to -ENOSYS or -ENOMEM case, the THP will
be split, and the subpages of fail-to-migrate THP will be tried to migrate
again, so we should not account the retry counter in the second loop,
since we already accounted 'nr_thp_failed' in the first loop.

Moreover we also do not need retry 10 times for -EAGAIN case for the
subpages of fail-to-migrate THP in the second loop, since we already
regarded the THP as migration failure, and save some migration time (for
the worst case, will try 512 * 10 times) according to previous discussion
[1].

[1] https://lore.kernel.org/linux-mm/87r13a7n04.fsf@yhuang6-desk2.ccr.corp.intel.com/

Link: https://lkml.kernel.org/r/20220817081408.513338-9-ying.huang@intel.com
Tested-by: "Huang, Ying" <ying.huang@intel.com>
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Baolin Wang 2022-08-17 16:14:08 +08:00 committed by Andrew Morton
parent 077309bc1e
commit 7047b5a40b
1 changed files with 2 additions and 3 deletions
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5
mm/migrate.c
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@ -1522,7 +1522,7 @@ thp_subpage_migration:
case -EAGAIN:
if (is_thp)
thp_retry++;
else
else if (!no_subpage_counting)
retry++;
nr_retry_pages += nr_subpages;
break;
@ -1548,8 +1548,7 @@ thp_subpage_migration:
}
}
}
if (!no_subpage_counting)
nr_failed += retry;
nr_failed += retry;
nr_thp_failed += thp_retry;
nr_failed_pages += nr_retry_pages;
/*