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 sEgw5QST 34/7DXC2cvToJVPsx+e/acLzusHLNLWoZhT4fL2gQw8q25lYZPbatxj2egSlPL5NWFT+tPX3hKk4rcreJtWMK+3epiJRfu6QY8z+xnDfJnvLadWJ44pykxCgtng3n+ZAlqilxzPRVOJZ1oDFt+Oxxl8GYo93hOgTdIs0DGLlwMdEGb0S9ScHjYUmse9ABArSPqXp+2WUF1h0XoJ6WEIAcPYAQ5VeG1HvILbGEwny+T5Fli+xB05D4Bt0cTvIvo/m8HiYmQtnrgUoHRkacQ9tgKDVR5sdc/LPYFo+vReJ+xUQ95VUbBs+kdN/dA12Oo81dZHi4J6MqM3mvkLd6v68tBaOJ9SB2JIr6f2ILV3KZ257VNjLIAZPNOL0OhOfe3BUbbFtXxtGFjg7Pj7QDMpUI6x049aJ4TJSAzRZiefSl6a8d2jAah9zBa/38Ng== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: --=_MailMate_DA6783EB-83AD-4FA1-A3A2-A403DFC46416_= Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On 15 Sep 2023, at 5:41, Baolin Wang wrote: > On 9/13/2023 12:28 AM, Zi Yan wrote: >> From: Zi Yan >> >> Since compaction code can compact >0 order folios, enable it during th= e >> process. >> >> Signed-off-by: Zi Yan >> --- >> mm/compaction.c | 25 ++++++++++--------------- >> 1 file changed, 10 insertions(+), 15 deletions(-) >> >> diff --git a/mm/compaction.c b/mm/compaction.c >> index 4300d877b824..f72af74094de 100644 >> --- a/mm/compaction.c >> +++ b/mm/compaction.c >> @@ -1087,11 +1087,17 @@ isolate_migratepages_block(struct compact_cont= rol *cc, unsigned long low_pfn, >> if (PageCompound(page) && !cc->alloc_contig) { >> const unsigned int order =3D compound_order(page); >> - if (likely(order <=3D MAX_ORDER)) { >> - low_pfn +=3D (1UL << order) - 1; >> - nr_scanned +=3D (1UL << order) - 1; >> + /* >> + * Compacting > pageblock_order pages does not improve >> + * memory fragmentation. Also skip hugetlbfs pages. >> + */ >> + if (likely(order >=3D pageblock_order) || PageHuge(page)) { > > IMO, if the compound page order is larger than the requested cc->order,= we should also fail the isolation, cause it also does not improve fragme= ntation, right? > Probably yes. I think the reasoning should be since compaction is asking = for cc->order, we should not compacting folios with orders larger than or equal to that,= since cc->order tells us the max free page order is smaller than it, otherwise = the allocation would happen already. I will add this condition in the next ve= rsion. >> + if (order <=3D MAX_ORDER) { >> + low_pfn +=3D (1UL << order) - 1; >> + nr_scanned +=3D (1UL << order) - 1; >> + } >> + goto isolate_fail; >> } >> - goto isolate_fail; >> } >> /* >> @@ -1214,17 +1220,6 @@ isolate_migratepages_block(struct compact_contr= ol *cc, unsigned long low_pfn, >> goto isolate_abort; >> } >> } >> - >> - /* >> - * folio become large since the non-locked check, >> - * and it's on LRU. >> - */ >> - if (unlikely(folio_test_large(folio) && !cc->alloc_contig)) > - = low_pfn +=3D folio_nr_pages(folio) - 1; >> - nr_scanned +=3D folio_nr_pages(folio) - 1; >> - folio_set_lru(folio); >> - goto isolate_fail_put; >> - } > > I do not think you can remove this validation, since previous validatio= n is lockless. So under the lock, we need re-check if the compound page o= rder is larger than pageblock_order or cc->order, that need fail to isola= te. This check should go away, but a new order check for large folios should = be added. Will add it. 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