From: Frederic Weisbecker <frederic@kernel.org>
To: Marcelo Tosatti <mtosatti@redhat.com>
Cc: atomlin@atomlin.com, 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
Subject: Re: [PATCH v12 2/6] mm/vmstat: Use vmstat_dirty to track CPU-specific vmstat discrepancies
Date: Fri, 30 Dec 2022 14:21:32 +0100 [thread overview]
Message-ID: <20221230132132.GA186035@lothringen> (raw)
In-Reply-To: <20221227121341.981235373@redhat.com>
On Tue, Dec 27, 2022 at 09:11:39AM -0300, Marcelo Tosatti wrote:
> @@ -606,6 +608,7 @@ static inline void mod_zone_state(struct
>
> if (z)
> zone_page_state_add(z, zone, item);
> + vmstat_mark_dirty();
> }
>
> void mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
> @@ -674,6 +677,7 @@ static inline void mod_node_state(struct
>
> if (z)
> node_page_state_add(z, pgdat, item);
> + vmstat_mark_dirty();
Looking at this further, about the two above chunks, there is a risk to
mark the wrong CPU dirty because those functions are preemptible and rely
on this_cpu_cmpxchg() to deal with preemption.
Thanks.
next prev parent reply other threads:[~2022-12-30 13:21 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-27 12:11 [PATCH v12 0/6] Ensure quiet_vmstat() is called when returning to userpace and when idle tick is stopped Marcelo Tosatti
2022-12-27 12:11 ` [PATCH v12 1/6] mm/vmstat: Add CPU-specific variable to track a vmstat discrepancy Marcelo Tosatti
2022-12-27 12:11 ` [PATCH v12 2/6] mm/vmstat: Use vmstat_dirty to track CPU-specific vmstat discrepancies Marcelo Tosatti
2022-12-30 13:21 ` Frederic Weisbecker [this message]
2023-01-01 0:38 ` Marcelo Tosatti
2023-01-04 13:34 ` Aaron Tomlin
2022-12-27 12:11 ` [PATCH v12 3/6] mm/vmstat: manage per-CPU stats from CPU context when NOHZ full Marcelo Tosatti
2022-12-27 12:11 ` [PATCH v12 4/6] tick/nohz_full: Ensure quiet_vmstat() is called on exit to user-mode when the idle tick is stopped Marcelo Tosatti
2022-12-27 12:11 ` [PATCH v12 5/6] tick/sched: Ensure quiet_vmstat() is called when the idle tick was stopped too Marcelo Tosatti
2022-12-27 12:11 ` [PATCH v12 6/6] mm/vmstat: avoid queueing work item if cpu stats are clean Marcelo Tosatti
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