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From: Shakeel Butt <>
To: Johannes Weiner <>
Cc: Andrew Morton <>,
	Rik van Riel <>, Linux MM <>,
	LKML <>,
	Kernel Team <>
Subject: Re: [PATCH] mm: vmscan: fix missing psi annotation for node_reclaim()
Date: Thu, 19 Aug 2021 08:04:19 -0700	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Wed, Aug 18, 2021 at 8:26 AM Johannes Weiner <> wrote:
> In a debugging session the other day, Rik noticed that node_reclaim()
> was missing memstall annotations. This means we'll miss pressure and
> lost productivity resulting from reclaim on an overloaded local NUMA
> node when vm.zone_reclaim_mode is enabled.
> There haven't been any reports, but that's likely because
> vm.zone_reclaim_mode hasn't been a commonly used feature recently, and
> the intersection between such setups and psi users is probably
> nil. Although, secondary memory such as CXL-connected DIMMS,
> persistent memory etc. and the page demotion patches that handle them
> (
> could soon make this a more common codepath again.
> Reported-by: Rik van Riel <>
> Signed-off-by: Johannes Weiner <>

Reviewed-by: Shakeel Butt <>

      reply	other threads:[~2021-08-19 15:04 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-18 15:24 Johannes Weiner
2021-08-19 15:04 ` Shakeel Butt [this message]

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