From: Marcelo Tosatti <mtosatti@redhat.com>
To: atomlin@redhat.com, frederic@kernel.org
Cc: cl@linux.com, tglx@linutronix.de, mingo@kernel.org,
peterz@infradead.org, pauld@redhat.com, neelx@redhat.com,
oleksandr@natalenko.name, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, Marcelo Tosatti <mtosatti@redhat.com>
Subject: [PATCH v10 1/6] mm/vmstat: Add CPU-specific variable to track a vmstat discrepancy
Date: Fri, 16 Dec 2022 16:45:41 -0300 [thread overview]
Message-ID: <20221216194904.075275493@redhat.com> (raw)
In-Reply-To: 20221216194540.202752779@redhat.com
From: Aaron Tomlin <atomlin@redhat.com>
Introduce a CPU-specific variable namely vmstat_dirty to indicate
if a vmstat imbalance is present for a given CPU. Therefore, at
the appropriate time, we can fold all the remaining differentials.
This patch also provides trivial helpers for modification and testing.
Signed-off-by: Aaron Tomlin <atomlin@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
---
mm/vmstat.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
Index: linux-2.6/mm/vmstat.c
===================================================================
--- linux-2.6.orig/mm/vmstat.c
+++ linux-2.6/mm/vmstat.c
@@ -194,6 +194,22 @@ void fold_vm_numa_events(void)
#endif
#ifdef CONFIG_SMP
+static DEFINE_PER_CPU_ALIGNED(bool, vmstat_dirty);
+
+static inline void vmstat_mark_dirty(void)
+{
+ this_cpu_write(vmstat_dirty, true);
+}
+
+static inline void vmstat_clear_dirty(void)
+{
+ this_cpu_write(vmstat_dirty, false);
+}
+
+static inline bool is_vmstat_dirty(void)
+{
+ return this_cpu_read(vmstat_dirty);
+}
int calculate_pressure_threshold(struct zone *zone)
{
next prev parent reply other threads:[~2022-12-16 19:53 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-16 19:45 [PATCH v10 0/6] Ensure quiet_vmstat() is called when returning to userpace and when idle tick is stopped Marcelo Tosatti
2022-12-16 19:45 ` Marcelo Tosatti [this message]
2022-12-16 19:45 ` [PATCH v10 2/6] mm/vmstat: Use vmstat_dirty to track CPU-specific vmstat discrepancies Marcelo Tosatti
2022-12-16 19:45 ` [PATCH v10 3/6] mm/vmstat: manage per-CPU stats from CPU context when NOHZ full Marcelo Tosatti
2022-12-16 19:45 ` [PATCH v10 4/6] tick/nohz_full: Ensure quiet_vmstat() is called on exit to user-mode when the idle tick is stopped Marcelo Tosatti
2022-12-16 19:45 ` [PATCH v10 5/6] tick/sched: Ensure quiet_vmstat() is called when the idle tick was stopped too Marcelo Tosatti
2022-12-16 19:45 ` [PATCH v10 6/6] mm/vmstat: avoid queueing work item if cpu stats are clean Marcelo Tosatti
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