From: Dave Hansen <dave.hansen@intel.com>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Rik van Riel <riel@surriel.com>
Cc: linux-kernel@vger.kernel.org,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Mel Gorman <mgorman@suse.de>,
x86@kernel.org
Subject: Re: [PATCH] smp: Evaluate local cond_func() before IPI side-effects
Date: Tue, 3 Dec 2024 17:38:30 -0800 [thread overview]
Message-ID: <cc8e8ed4-0181-492a-aff4-71ce5841c891@intel.com> (raw)
In-Reply-To: <20241203183905.3477210-1-mathieu.desnoyers@efficios.com>
On 12/3/24 10:39, Mathieu Desnoyers wrote:
> If cond_func() depends on loading shared state updated by other CPU's
> IPI handlers func(), then triggering execution of remote CPUs IPI before
> evaluating cond_func() may have unexpected consequences.
I always thought this was on purpose so cond_func() can be executed in
parallel with the remote work.
Could we double-check that this doesn't meaningfully slow down IPIs that
have longer work to do?
next prev parent reply other threads:[~2024-12-04 1:38 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-12-03 18:39 Mathieu Desnoyers
2024-12-04 1:38 ` Dave Hansen [this message]
2024-12-05 14:59 ` Mathieu Desnoyers
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