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From: Peter Zijlstra <peterz@infradead.org>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: Nicolas Saenz Julienne <nsaenzju@redhat.com>,
	akpm@linux-foundation.org, frederic@kernel.org,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	tglx@linutronix.de, cl@linux.com, 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
Subject: Re: [PATCH 0/6] mm: Remote LRU per-cpu pagevec cache/per-cpu page list drain support
Date: Wed, 22 Sep 2021 13:28:17 +0200	[thread overview]
Message-ID: <20210922112817.GO4323@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <f608b4bf-aa36-b0c4-e748-4f39010f3d06@suse.cz>

On Tue, Sep 21, 2021 at 07:59:51PM +0200, Vlastimil Babka wrote:

> These days the pcplist protection is done by local_lock, which solved
> the RT concerns. Probably a stupid/infeasible idea, but maybe what you
> want to achieve could be more generally solved at the local_lock level?
> That on NOHZ_FULL CPUs, local_locks could have this mode where they
> could synchronize with remote cpus?

local_lock and spinlock have different rules, local_lock for example can
never cause an irq inversion, unlike a spinlock.

  reply	other threads:[~2021-09-22 11:28 UTC|newest]

Thread overview: 24+ 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 ` [PATCH 1/6] mm/swap: Introduce lru_cpu_needs_drain() Nicolas Saenz Julienne
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  8:47       ` nsaenzju
2021-09-22  9:20       ` Sebastian Andrzej Siewior
2021-09-22  9:50         ` nsaenzju
2021-09-22  9:50           ` nsaenzju
2021-09-22 11:37       ` Peter Zijlstra
2021-09-22 11:43         ` nsaenzju
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 [this message]
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
2021-09-27  9:30         ` nsaenzju

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