From: Alex Shi <alex.shi@linux.alibaba.com>
To: Alexander Duyck <alexander.duyck@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mgorman@techsingularity.net>,
Tejun Heo <tj@kernel.org>, Hugh Dickins <hughd@google.com>,
Konstantin Khlebnikov <khlebnikov@yandex-team.ru>,
Daniel Jordan <daniel.m.jordan@oracle.com>,
Yang Shi <yang.shi@linux.alibaba.com>,
Matthew Wilcox <willy@infradead.org>,
Johannes Weiner <hannes@cmpxchg.org>,
kbuild test robot <lkp@intel.com>, linux-mm <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
cgroups@vger.kernel.org, Shakeel Butt <shakeelb@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Wei Yang <richard.weiyang@gmail.com>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Rong Chen <rong.a.chen@intel.com>,
Michal Hocko <mhocko@kernel.org>,
Vladimir Davydov <vdavydov.dev@gmail.com>
Subject: Re: [PATCH v17 17/21] mm/lru: replace pgdat lru_lock with lruvec lock
Date: Tue, 28 Jul 2020 23:39:31 +0800 [thread overview]
Message-ID: <1fd45e69-3a50-aae8-bcc4-47d891a5e263@linux.alibaba.com> (raw)
In-Reply-To: <CAKgT0UdaW4Rf43yULhQBuP07vQgmoPbaWHGKv1Z7fEPP6jH83w@mail.gmail.com>
在 2020/7/28 上午7:34, Alexander Duyck 写道:
> It might make more sense to look at modifying
> compact_unlock_should_abort and compact_lock_irqsave (which always
> returns true so should probably be a void) to address the deficiencies
> they have that make them unusable for you.
One of possible reuse for the func compact_unlock_should_abort, could be
like the following, the locked parameter reused different in 2 places.
but, it's seems no this style usage in kernel, isn't it?
Thanks
Alex
From 41d5ce6562f20f74bc6ac2db83e226ac28d56e90 Mon Sep 17 00:00:00 2001
From: Alex Shi <alex.shi@linux.alibaba.com>
Date: Tue, 28 Jul 2020 21:19:32 +0800
Subject: [PATCH] compaction polishing
Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
---
mm/compaction.c | 71 ++++++++++++++++++++++++---------------------------------
1 file changed, 30 insertions(+), 41 deletions(-)
diff --git a/mm/compaction.c b/mm/compaction.c
index c28a43481f01..36fce988de3e 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -479,20 +479,20 @@ static bool test_and_set_skip(struct compact_control *cc, struct page *page,
*
* Always returns true which makes it easier to track lock state in callers.
*/
-static bool compact_lock_irqsave(spinlock_t *lock, unsigned long *flags,
+static void compact_lock_irqsave(spinlock_t *lock, unsigned long *flags,
struct compact_control *cc)
__acquires(lock)
{
/* Track if the lock is contended in async mode */
if (cc->mode == MIGRATE_ASYNC && !cc->contended) {
if (spin_trylock_irqsave(lock, *flags))
- return true;
+ return;
cc->contended = true;
}
spin_lock_irqsave(lock, *flags);
- return true;
+ return;
}
/*
@@ -511,11 +511,11 @@ static bool compact_lock_irqsave(spinlock_t *lock, unsigned long *flags,
* scheduled)
*/
static bool compact_unlock_should_abort(spinlock_t *lock,
- unsigned long flags, bool *locked, struct compact_control *cc)
+ unsigned long flags, void **locked, struct compact_control *cc)
{
if (*locked) {
spin_unlock_irqrestore(lock, flags);
- *locked = false;
+ *locked = NULL;
}
if (fatal_signal_pending(current)) {
@@ -543,7 +543,7 @@ static unsigned long isolate_freepages_block(struct compact_control *cc,
int nr_scanned = 0, total_isolated = 0;
struct page *cursor;
unsigned long flags = 0;
- bool locked = false;
+ struct compact_control *locked = NULL;
unsigned long blockpfn = *start_pfn;
unsigned int order;
@@ -565,7 +565,7 @@ static unsigned long isolate_freepages_block(struct compact_control *cc,
*/
if (!(blockpfn % SWAP_CLUSTER_MAX)
&& compact_unlock_should_abort(&cc->zone->lock, flags,
- &locked, cc))
+ (void**)&locked, cc))
break;
nr_scanned++;
@@ -599,8 +599,8 @@ static unsigned long isolate_freepages_block(struct compact_control *cc,
* recheck as well.
*/
if (!locked) {
- locked = compact_lock_irqsave(&cc->zone->lock,
- &flags, cc);
+ compact_lock_irqsave(&cc->zone->lock, &flags, cc);
+ locked = cc;
/* Recheck this is a buddy page under lock */
if (!PageBuddy(page))
@@ -787,7 +787,7 @@ static bool too_many_isolated(pg_data_t *pgdat)
unsigned long nr_scanned = 0, nr_isolated = 0;
struct lruvec *lruvec;
unsigned long flags = 0;
- struct lruvec *locked_lruvec = NULL;
+ struct lruvec *locked = NULL;
struct page *page = NULL, *valid_page = NULL;
unsigned long start_pfn = low_pfn;
bool skip_on_failure = false;
@@ -847,21 +847,11 @@ static bool too_many_isolated(pg_data_t *pgdat)
* contention, to give chance to IRQs. Abort completely if
* a fatal signal is pending.
*/
- if (!(low_pfn % SWAP_CLUSTER_MAX)) {
- if (locked_lruvec) {
- unlock_page_lruvec_irqrestore(locked_lruvec,
- flags);
- locked_lruvec = NULL;
- }
-
- if (fatal_signal_pending(current)) {
- cc->contended = true;
-
- low_pfn = 0;
- goto fatal_pending;
- }
-
- cond_resched();
+ if (!(low_pfn % SWAP_CLUSTER_MAX)
+ && compact_unlock_should_abort(&locked->lru_lock, flags,
+ (void**)&locked, cc)) {
+ low_pfn = 0;
+ goto fatal_pending;
}
if (!pfn_valid_within(low_pfn))
@@ -932,9 +922,9 @@ static bool too_many_isolated(pg_data_t *pgdat)
*/
if (unlikely(__PageMovable(page)) &&
!PageIsolated(page)) {
- if (locked_lruvec) {
- unlock_page_lruvec_irqrestore(locked_lruvec, flags);
- locked_lruvec = NULL;
+ if (locked) {
+ unlock_page_lruvec_irqrestore(locked, flags);
+ locked = NULL;
}
if (!isolate_movable_page(page, isolate_mode))
@@ -979,13 +969,13 @@ static bool too_many_isolated(pg_data_t *pgdat)
lruvec = mem_cgroup_page_lruvec(page, pgdat);
/* If we already hold the lock, we can skip some rechecking */
- if (lruvec != locked_lruvec) {
- if (locked_lruvec)
- unlock_page_lruvec_irqrestore(locked_lruvec,
+ if (lruvec != locked) {
+ if (locked)
+ unlock_page_lruvec_irqrestore(locked,
flags);
compact_lock_irqsave(&lruvec->lru_lock, &flags, cc);
- locked_lruvec = lruvec;
+ locked = lruvec;
rcu_read_unlock();
lruvec_memcg_debug(lruvec, page);
@@ -1041,9 +1031,9 @@ static bool too_many_isolated(pg_data_t *pgdat)
isolate_fail_put:
/* Avoid potential deadlock in freeing page under lru_lock */
- if (locked_lruvec) {
- unlock_page_lruvec_irqrestore(locked_lruvec, flags);
- locked_lruvec = NULL;
+ if (locked) {
+ unlock_page_lruvec_irqrestore(locked, flags);
+ locked = NULL;
}
put_page(page);
@@ -1057,10 +1047,9 @@ static bool too_many_isolated(pg_data_t *pgdat)
* page anyway.
*/
if (nr_isolated) {
- if (locked_lruvec) {
- unlock_page_lruvec_irqrestore(locked_lruvec,
- flags);
- locked_lruvec = NULL;
+ if (locked) {
+ unlock_page_lruvec_irqrestore(locked, flags);
+ locked = NULL;
}
putback_movable_pages(&cc->migratepages);
cc->nr_migratepages = 0;
@@ -1087,8 +1076,8 @@ static bool too_many_isolated(pg_data_t *pgdat)
page = NULL;
isolate_abort:
- if (locked_lruvec)
- unlock_page_lruvec_irqrestore(locked_lruvec, flags);
+ if (locked)
+ unlock_page_lruvec_irqrestore(locked, flags);
if (page) {
SetPageLRU(page);
put_page(page);
--
1.8.3.1
next prev parent reply other threads:[~2020-07-28 15:39 UTC|newest]
Thread overview: 101+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-25 12:59 [PATCH v17 00/21] per memcg lru lock Alex Shi
2020-07-25 12:59 ` [PATCH v17 01/21] mm/vmscan: remove unnecessary lruvec adding Alex Shi
2020-08-06 3:47 ` Alex Shi
2020-07-25 12:59 ` [PATCH v17 02/21] mm/page_idle: no unlikely double check for idle page counting Alex Shi
2020-07-25 12:59 ` [PATCH v17 03/21] mm/compaction: correct the comments of compact_defer_shift Alex Shi
2020-07-27 17:29 ` Alexander Duyck
2020-07-28 11:59 ` Alex Shi
2020-07-28 14:17 ` Alexander Duyck
2020-07-25 12:59 ` [PATCH v17 04/21] mm/compaction: rename compact_deferred as compact_should_defer Alex Shi
2020-07-25 12:59 ` [PATCH v17 05/21] mm/thp: move lru_add_page_tail func to huge_memory.c Alex Shi
2020-07-25 12:59 ` [PATCH v17 06/21] mm/thp: clean up lru_add_page_tail Alex Shi
2020-07-25 12:59 ` [PATCH v17 07/21] mm/thp: remove code path which never got into Alex Shi
2020-07-25 12:59 ` [PATCH v17 08/21] mm/thp: narrow lru locking Alex Shi
2020-07-25 12:59 ` [PATCH v17 09/21] mm/memcg: add debug checking in lock_page_memcg Alex Shi
2020-07-25 12:59 ` [PATCH v17 10/21] mm/swap: fold vm event PGROTATED into pagevec_move_tail_fn Alex Shi
2020-07-25 12:59 ` [PATCH v17 11/21] mm/lru: move lru_lock holding in func lru_note_cost_page Alex Shi
2020-08-05 21:18 ` Alexander Duyck
2020-07-25 12:59 ` [PATCH v17 12/21] mm/lru: move lock into lru_note_cost Alex Shi
2020-07-25 12:59 ` [PATCH v17 13/21] mm/lru: introduce TestClearPageLRU Alex Shi
2020-07-29 3:53 ` Alex Shi
2020-08-05 22:43 ` Alexander Duyck
2020-08-06 1:54 ` Alex Shi
2020-08-06 14:41 ` Alexander Duyck
2020-07-25 12:59 ` [PATCH v17 14/21] mm/compaction: do page isolation first in compaction Alex Shi
2020-08-04 21:35 ` Alexander Duyck
2020-08-06 18:38 ` Alexander Duyck
2020-08-07 3:24 ` Alex Shi
2020-08-07 14:51 ` Alexander Duyck
2020-08-10 13:10 ` Alex Shi
2020-08-10 14:41 ` Alexander Duyck
2020-08-11 8:22 ` Alex Shi
2020-08-11 14:47 ` Alexander Duyck
2020-08-12 11:43 ` Alex Shi
2020-08-12 12:16 ` Alex Shi
2020-08-12 16:51 ` Alexander Duyck
2020-08-13 1:46 ` Alex Shi
2020-08-13 2:17 ` Alexander Duyck
2020-08-13 3:52 ` Alex Shi
2020-08-13 4:02 ` [RFC PATCH 0/3] " Alexander Duyck
2020-08-13 4:02 ` [RFC PATCH 1/3] mm: Drop locked from isolate_migratepages_block Alexander Duyck
2020-08-13 6:56 ` Alex Shi
2020-08-13 14:32 ` Alexander Duyck
2020-08-14 7:25 ` Alex Shi
2020-08-13 7:44 ` Alex Shi
2020-08-13 14:26 ` Alexander Duyck
2020-08-13 4:02 ` [RFC PATCH 2/3] mm: Drop use of test_and_set_skip in favor of just setting skip Alexander Duyck
2020-08-14 7:19 ` Alex Shi
2020-08-14 14:24 ` Alexander Duyck
2020-08-14 21:15 ` Alexander Duyck
[not found] ` <650ab639-e66f-5ca6-a9a5-31e61c134ae7@linux.alibaba.com>
2020-08-17 15:38 ` Alexander Duyck
2020-08-18 6:50 ` Alex Shi
2020-08-13 4:02 ` [RFC PATCH 3/3] mm: Identify compound pages sooner in isolate_migratepages_block Alexander Duyck
2020-08-14 7:20 ` Alex Shi
2020-08-17 22:58 ` [PATCH v17 14/21] mm/compaction: do page isolation first in compaction Alexander Duyck
2020-07-25 12:59 ` [PATCH v17 15/21] mm/thp: add tail pages into lru anyway in split_huge_page() Alex Shi
2020-07-25 12:59 ` [PATCH v17 16/21] mm/swap: serialize memcg changes in pagevec_lru_move_fn Alex Shi
2020-07-25 12:59 ` [PATCH v17 17/21] mm/lru: replace pgdat lru_lock with lruvec lock Alex Shi
2020-07-27 23:34 ` Alexander Duyck
2020-07-28 7:15 ` Alex Shi
2020-07-28 11:19 ` Alex Shi
2020-07-28 14:54 ` Alexander Duyck
2020-07-29 1:00 ` Alex Shi
2020-07-29 1:27 ` Alexander Duyck
2020-07-29 2:27 ` Alex Shi
2020-07-28 15:39 ` Alex Shi [this message]
2020-07-28 15:55 ` Alexander Duyck
2020-07-29 0:48 ` Alex Shi
2020-07-29 3:54 ` Alex Shi
2020-08-06 7:41 ` Alex Shi
2020-07-25 12:59 ` [PATCH v17 18/21] mm/lru: introduce the relock_page_lruvec function Alex Shi
2020-07-29 17:52 ` Alexander Duyck
2020-07-30 6:08 ` Alex Shi
2020-07-31 14:20 ` Alexander Duyck
2020-07-31 21:14 ` [PATCH RFC] mm: Add function for testing if the current lruvec lock is valid alexander.h.duyck
2020-07-31 23:54 ` Alex Shi
2020-08-02 18:20 ` Alexander Duyck
2020-08-04 6:13 ` Alex Shi
2020-07-25 12:59 ` [PATCH v17 19/21] mm/vmscan: use relock for move_pages_to_lru Alex Shi
2020-08-03 22:49 ` Alexander Duyck
2020-08-04 6:23 ` Alex Shi
2020-07-25 12:59 ` [PATCH v17 20/21] mm/pgdat: remove pgdat lru_lock Alex Shi
2020-08-03 22:42 ` Alexander Duyck
2020-08-03 22:45 ` Alexander Duyck
2020-08-04 6:22 ` Alex Shi
2020-07-25 12:59 ` [PATCH v17 21/21] mm/lru: revise the comments of lru_lock Alex Shi
2020-08-03 22:37 ` Alexander Duyck
2020-08-04 10:04 ` Alex Shi
2020-08-04 14:29 ` Alexander Duyck
2020-08-06 1:39 ` Alex Shi
2020-08-06 16:27 ` Alexander Duyck
2020-07-27 5:40 ` [PATCH v17 00/21] per memcg lru lock Alex Shi
2020-07-29 14:49 ` Alex Shi
2020-07-29 18:06 ` Hugh Dickins
2020-07-30 2:16 ` Alex Shi
2020-08-03 15:07 ` Michal Hocko
2020-08-04 6:14 ` Alex Shi
2020-07-31 21:31 ` Alexander Duyck
2020-08-04 8:36 ` Alex Shi
2020-08-04 8:36 ` Alex Shi
2020-08-04 8:37 ` Alex Shi
2020-08-04 8:37 ` Alex Shi
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