From: Nicolas Saenz Julienne <nsaenzju@redhat.com>
To: akpm@linux-foundation.org, frederic@kernel.org
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
tglx@linutronix.de, cl@linux.com, peterz@infradead.org,
juri.lelli@redhat.com, mingo@redhat.com, mtosatti@redhat.com,
nilal@redhat.com, mgorman@suse.de, ppandit@redhat.com,
williams@redhat.com, bigeasy@linutronix.de,
anna-maria@linutronix.de, linux-rt-users@vger.kernel.org,
Nicolas Saenz Julienne <nsaenzju@redhat.com>
Subject: [PATCH 1/6] mm/swap: Introduce lru_cpu_needs_drain()
Date: Tue, 21 Sep 2021 18:13:19 +0200 [thread overview]
Message-ID: <20210921161323.607817-2-nsaenzju@redhat.com> (raw)
In-Reply-To: <20210921161323.607817-1-nsaenzju@redhat.com>
Upcoming patches will need to check whether a CPU needs to drain its LRU
pagevecs on multiple locations. So move the check into its own function.
Signed-off-by: Nicolas Saenz Julienne <nsaenzju@redhat.com>
---
mm/swap.c | 20 ++++++++++++--------
1 file changed, 12 insertions(+), 8 deletions(-)
diff --git a/mm/swap.c b/mm/swap.c
index 04b678342c02..e7f9e4018ccf 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -726,6 +726,17 @@ static void lru_add_drain_per_cpu(struct work_struct *dummy)
lru_add_drain();
}
+static bool lru_cpu_needs_drain(int cpu)
+{
+ return pagevec_count(&per_cpu(lru_pvecs.lru_add, cpu)) ||
+ data_race(pagevec_count(&per_cpu(lru_rotate.pvec, cpu))) ||
+ pagevec_count(&per_cpu(lru_pvecs.lru_deactivate_file, cpu)) ||
+ pagevec_count(&per_cpu(lru_pvecs.lru_deactivate, cpu)) ||
+ pagevec_count(&per_cpu(lru_pvecs.lru_lazyfree, cpu)) ||
+ need_activate_page_drain(cpu) ||
+ has_bh_in_lru(cpu, NULL);
+}
+
/*
* Doesn't need any cpu hotplug locking because we do rely on per-cpu
* kworkers being shut down before our page_alloc_cpu_dead callback is
@@ -808,14 +819,7 @@ inline void __lru_add_drain_all(bool force_all_cpus)
for_each_online_cpu(cpu) {
struct work_struct *work = &per_cpu(lru_add_drain_work, cpu);
- if (force_all_cpus ||
- pagevec_count(&per_cpu(lru_pvecs.lru_add, cpu)) ||
- data_race(pagevec_count(&per_cpu(lru_rotate.pvec, cpu))) ||
- pagevec_count(&per_cpu(lru_pvecs.lru_deactivate_file, cpu)) ||
- pagevec_count(&per_cpu(lru_pvecs.lru_deactivate, cpu)) ||
- pagevec_count(&per_cpu(lru_pvecs.lru_lazyfree, cpu)) ||
- need_activate_page_drain(cpu) ||
- has_bh_in_lru(cpu, NULL)) {
+ if (force_all_cpus || lru_cpu_needs_drain(cpu)) {
INIT_WORK(work, lru_add_drain_per_cpu);
queue_work_on(cpu, mm_percpu_wq, work);
__cpumask_set_cpu(cpu, &has_work);
--
2.31.1
next prev parent reply other threads:[~2021-09-21 16:13 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-21 16:13 [PATCH 0/6] mm: Remote LRU per-cpu pagevec cache/per-cpu page list drain support Nicolas Saenz Julienne
2021-09-21 16:13 ` Nicolas Saenz Julienne [this message]
2021-09-21 16:13 ` [PATCH 2/6] mm/swap: Introduce alternative per-cpu LRU cache locking Nicolas Saenz Julienne
2021-09-21 22:03 ` Peter Zijlstra
2021-09-22 8:47 ` nsaenzju
2021-09-22 9:20 ` Sebastian Andrzej Siewior
2021-09-22 9:50 ` nsaenzju
2021-09-22 11:37 ` Peter Zijlstra
2021-09-22 11:43 ` nsaenzju
2021-09-21 16:13 ` [PATCH 3/6] mm/swap: Allow remote LRU cache draining Nicolas Saenz Julienne
2021-09-21 16:13 ` [PATCH 4/6] mm/page_alloc: Introduce alternative per-cpu list locking Nicolas Saenz Julienne
2021-09-21 16:13 ` [PATCH 5/6] mm/page_alloc: Allow remote per-cpu page list draining Nicolas Saenz Julienne
2021-09-21 16:13 ` [PATCH 6/6] sched/isolation: Enable 'remote_pcpu_cache_access' on NOHZ_FULL systems Nicolas Saenz Julienne
2021-09-21 17:51 ` [PATCH 0/6] mm: Remote LRU per-cpu pagevec cache/per-cpu page list drain support Andrew Morton
2021-09-21 17:59 ` Vlastimil Babka
2021-09-22 11:28 ` Peter Zijlstra
2021-09-22 22:09 ` Thomas Gleixner
2021-09-23 7:12 ` Vlastimil Babka
2021-09-23 10:36 ` Thomas Gleixner
2021-09-27 9:30 ` nsaenzju
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