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Fri, 14 Aug 2020 10:31:48 -0700 (PDT) From: Minchan Kim To: Andrew Morton Cc: linux-mm , Joonsoo Kim , Vlastimil Babka , John Dias , Suren Baghdasaryan , pullip.cho@samsung.com, Minchan Kim Subject: [RFC 7/7] mm/page_isolation: avoid drain_all_pages for alloc_pages_bulk Date: Fri, 14 Aug 2020 10:31:31 -0700 Message-Id: <20200814173131.2803002-8-minchan@kernel.org> X-Mailer: git-send-email 2.28.0.220.ged08abb693-goog In-Reply-To: <20200814173131.2803002-1-minchan@kernel.org> References: <20200814173131.2803002-1-minchan@kernel.org> MIME-Version: 1.0 X-Rspamd-Queue-Id: DEB2F18140B67 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 Content-Transfer-Encoding: quoted-printable 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: The draining PCP of CPUs whenever we marked a pageblock MIGRATE_ISOLATE in the big range is too expensive when we consider fact that alloc_pages_bulk is just best effort approach. Thus, this patch avoids the flush when the semantic allows ISOLATE_FAILURE. Signed-off-by: Minchan Kim --- mm/page_isolation.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/mm/page_isolation.c b/mm/page_isolation.c index 6208db89a31b..e70bdded02e9 100644 --- a/mm/page_isolation.c +++ b/mm/page_isolation.c @@ -54,9 +54,7 @@ static int set_migratetype_isolate(struct page *page, i= nt migratetype, int isol_ =20 out: spin_unlock_irqrestore(&zone->lock, flags); - if (!ret) { - drain_all_pages(zone); - } else { + if (ret) { WARN_ON_ONCE(zone_idx(zone) =3D=3D ZONE_MOVABLE); =20 if ((isol_flags & REPORT_FAILURE) && unmovable) @@ -197,6 +195,8 @@ int start_isolate_page_range(unsigned long start_pfn,= unsigned long end_pfn, undo_pfn =3D pfn; goto undo; } + if (!(flags & ALLOW_ISOLATE_FAILURE)) + drain_all_pages(page_zone(page)); nr_isolate_pageblock++; } } --=20 2.28.0.220.ged08abb693-goog