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Fri, 19 Mar 2021 10:51:52 -0700 (PDT) Received: from bbox-1.mtv.corp.google.com ([2620:15c:211:201:913d:5573:c956:f033]) by smtp.gmail.com with ESMTPSA id w8sm5498287pgk.46.2021.03.19.10.51.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 19 Mar 2021 10:51:51 -0700 (PDT) From: Minchan Kim To: Andrew Morton Cc: linux-mm , LKML , joaodias@google.com, surenb@google.com, cgoldswo@codeaurora.org, willy@infradead.org, mhocko@suse.com, david@redhat.com, vbabka@suse.cz, linux-fsdevel@vger.kernel.org, oliver.sang@intel.com, Minchan Kim Subject: [PATCH v4 2/3] mm: replace migrate_[prep|finish] with lru_cache_[disable|enable] Date: Fri, 19 Mar 2021 10:51:26 -0700 Message-Id: <20210319175127.886124-2-minchan@kernel.org> X-Mailer: git-send-email 2.31.0.rc2.261.g7f71774620-goog In-Reply-To: <20210319175127.886124-1-minchan@kernel.org> References: <20210319175127.886124-1-minchan@kernel.org> MIME-Version: 1.0 X-Stat-Signature: t67k9yqnw9mrsna8jiikbjoeb6bekq97 X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 6FD69C0042C6 Received-SPF: none (gmail.com>: No applicable sender policy available) receiver=imf22; identity=mailfrom; envelope-from=""; helo=mail-pl1-f173.google.com; client-ip=209.85.214.173 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1616176320-381031 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: Currently, migrate_[prep|finish] is merely a wrapper of lru_cache_[disable|enable]. There is not much to gain from having additional abstraction. Use lru_cache_[disable|enable] instead of migrate_[prep|finish], which would be more descriptive. note: migrate_prep_local in compaction.c changed into lru_add_drain to avoid CPU schedule cost with involving many other CPUs to keep keep old behavior. Acked-by: Michal Hocko Reviewed-by: David Hildenbrand Signed-off-by: Minchan Kim --- include/linux/migrate.h | 7 ------- mm/compaction.c | 3 ++- mm/mempolicy.c | 8 ++++---- mm/migrate.c | 28 ++-------------------------- mm/page_alloc.c | 4 ++-- 5 files changed, 10 insertions(+), 40 deletions(-) diff --git a/include/linux/migrate.h b/include/linux/migrate.h index 9e4a2dc8622c..6155d97ec76c 100644 --- a/include/linux/migrate.h +++ b/include/linux/migrate.h @@ -45,9 +45,6 @@ extern struct page *alloc_migration_target(struct page = *page, unsigned long priv extern int isolate_movable_page(struct page *page, isolate_mode_t mode); extern void putback_movable_page(struct page *page); =20 -extern void migrate_prep(void); -extern void migrate_finish(void); -extern void migrate_prep_local(void); extern void migrate_page_states(struct page *newpage, struct page *page)= ; extern void migrate_page_copy(struct page *newpage, struct page *page); extern int migrate_huge_page_move_mapping(struct address_space *mapping, @@ -67,10 +64,6 @@ static inline struct page *alloc_migration_target(stru= ct page *page, static inline int isolate_movable_page(struct page *page, isolate_mode_t= mode) { return -EBUSY; } =20 -static inline int migrate_prep(void) { return -ENOSYS; } -static inline int migrate_finish(void) { return -ENOSYS; } -static inline int migrate_prep_local(void) { return -ENOSYS; } - static inline void migrate_page_states(struct page *newpage, struct page= *page) { } diff --git a/mm/compaction.c b/mm/compaction.c index e04f4476e68e..3be017ececc0 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -2319,7 +2319,8 @@ compact_zone(struct compact_control *cc, struct cap= ture_control *capc) trace_mm_compaction_begin(start_pfn, cc->migrate_pfn, cc->free_pfn, end_pfn, sync); =20 - migrate_prep_local(); + /* lru_add_drain_all could be expensive with involving other CPUs */ + lru_add_drain(); =20 while ((ret =3D compact_finished(cc)) =3D=3D COMPACT_CONTINUE) { int err; diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 495b43a4b0f8..6daf9cc4c843 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1124,7 +1124,7 @@ int do_migrate_pages(struct mm_struct *mm, const no= demask_t *from, int err =3D 0; nodemask_t tmp; =20 - migrate_prep(); + lru_cache_disable(); =20 mmap_read_lock(mm); =20 @@ -1209,7 +1209,7 @@ int do_migrate_pages(struct mm_struct *mm, const no= demask_t *from, } mmap_read_unlock(mm); =20 - migrate_finish(); + lru_cache_enable(); if (err < 0) return err; return busy; @@ -1325,7 +1325,7 @@ static long do_mbind(unsigned long start, unsigned = long len, =20 if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) { =20 - migrate_prep(); + lru_cache_disable(); } { NODEMASK_SCRATCH(scratch); @@ -1374,7 +1374,7 @@ static long do_mbind(unsigned long start, unsigned = long len, mpol_out: mpol_put(new); if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) - migrate_finish(); + lru_cache_enable(); return err; } =20 diff --git a/mm/migrate.c b/mm/migrate.c index 4d6c306d41c6..acc9913e4303 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -57,30 +57,6 @@ =20 #include "internal.h" =20 -/* - * migrate_prep() needs to be called before we start compiling a list of= pages - * to be migrated using isolate_lru_page(). If scheduling work on other = CPUs is - * undesirable, use migrate_prep_local() - */ -void migrate_prep(void) -{ - /* - * Clear the LRU lists so pages can be isolated. - */ - lru_cache_disable(); -} - -void migrate_finish(void) -{ - lru_cache_enable(); -} - -/* Do the necessary work of migrate_prep but not if it involves other CP= Us */ -void migrate_prep_local(void) -{ - lru_add_drain(); -} - int isolate_movable_page(struct page *page, isolate_mode_t mode) { struct address_space *mapping; @@ -1771,7 +1747,7 @@ static int do_pages_move(struct mm_struct *mm, node= mask_t task_nodes, int start, i; int err =3D 0, err1; =20 - migrate_prep(); + lru_cache_disable(); =20 for (i =3D start =3D 0; i < nr_pages; i++) { const void __user *p; @@ -1840,7 +1816,7 @@ static int do_pages_move(struct mm_struct *mm, node= mask_t task_nodes, if (err >=3D 0) err =3D err1; out: - migrate_finish(); + lru_cache_enable(); return err; } =20 diff --git a/mm/page_alloc.c b/mm/page_alloc.c index af5d4eeb2999..bf1606c7965a 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -8467,7 +8467,7 @@ static int __alloc_contig_migrate_range(struct comp= act_control *cc, .gfp_mask =3D GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL, }; =20 - migrate_prep(); + lru_cache_disable(); =20 while (pfn < end || !list_empty(&cc->migratepages)) { if (fatal_signal_pending(current)) { @@ -8496,7 +8496,7 @@ static int __alloc_contig_migrate_range(struct comp= act_control *cc, NULL, (unsigned long)&mtc, cc->mode, MR_CONTIG_RANGE); } =20 - migrate_finish(); + lru_cache_enable(); if (ret < 0) { putback_movable_pages(&cc->migratepages); return ret; --=20 2.31.0.rc2.261.g7f71774620-goog