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(done) > Thanks. Hi Baolin, How often do you see this happening? >> Signed-off-by: Baolin Wang > > I doubt this will make much difference, because if such a larger order = free > page exists, we shouldn't have a reason to be compacting for a lower or= der > in the first place? Unless kswapd gets us such a free block in the background right after get_page_from_freelist() and before compaction finishes in the allocation= slow path. If this happens often and cc->order is not -1, it might be better to stop= compaction and get_page_from_freelist() to save cycles on unnecessary pfn= scanning. For completeness, when cc->order =3D=3D -1, the logic does not = change. > >> --- >> mm/compaction.c | 4 +++- >> 1 file changed, 3 insertions(+), 1 deletion(-) >> >> diff --git a/mm/compaction.c b/mm/compaction.c >> index 27ada42924d5..066b72b3471a 100644 >> --- a/mm/compaction.c >> +++ b/mm/compaction.c >> @@ -1346,12 +1346,14 @@ static bool suitable_migration_target(struct c= ompact_control *cc, >> { >> /* If the page is a large free page, then disallow migration */ >> if (PageBuddy(page)) { >> + int order =3D cc->order > 0 ? cc->order : pageblock_order; >> + >> /* >> * We are checking page_order without zone->lock taken. But >> * the only small danger is that we skip a potentially suitable >> * pageblock, so it's not worth to check order for valid range. >> */ >> - if (buddy_order_unsafe(page) >=3D pageblock_order) >> + if (buddy_order_unsafe(page) >=3D order) >> return false; >> } >> -- Best Regards, Yan, Zi --=_MailMate_EC359E8B-9628-4E0A-93E7-7B79D4DB9C6E_= Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQJDBAEBCgAtFiEE6rR4j8RuQ2XmaZol4n+egRQHKFQFAmXKMpAPHHppeUBudmlk aWEuY29tAAoJEOJ/noEUByhUgSYQAJA+p8PbfyilA4bzNyOm4SFYsVwTUN1nvWJL CsitHbqCwgkeuHaaaPLBk+GKglYNFbwP1D1qILXtWs8fj+1q4hQb1+0WZTvLp/VE Z9gY6K68PtUk4J5UZrNVAk54ak9kYS5qVyEAbWLLbZEP8r2r6C3PDXtWusEOTvQo IwE4faMLrt8CChKlceiBMKaSISQQlaNahM41iy/bu3cat2XCwuZT23KjXQgcYJe8 qfwHMme4X5JOEZD249QYv57YZMp0OW4zQ88sxwHip4cMV6hXeA6yfbIBpMLO/au4 38S6ANiMBPFBGCCrnTCPUlaYareFaBB7R6z+oPg0Ufp75Oc7vtrsXCLpDyCplNlZ /JhjUpRfULSaGQsVW9Bmq6WypdP38J9pZx8sd/lao1Hj10HnkGIjKaZYli3a6xAQ 7lePrycOW2fP7FvBisND6aWpVBKnBFmYJb17kK1MRQhM4r+OhcKtG77rEOb/ed2E pXplXfi2np6iVQ1sJLCkgLkL7xseuXsIm914zh4fJTV6Xeh5rVQf1fYauWjnmmiB uRIki4a3tlSFpVl5Q5W04xb63aRUrlB1mhlekPBiM7RmGXZy2R4Q1M4lcam9aenU FpRNeAFf6TZbbl//haxXrmjdEZmuVEmN5naeLQc+p77wZtEVfyFrH1k7dwalJSws IBHDpuQR =IYH7 -----END PGP SIGNATURE----- --=_MailMate_EC359E8B-9628-4E0A-93E7-7B79D4DB9C6E_=--