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Date:   Thu, 17 Jan 2019 09:13:14 +0100
From:   Peter Zijlstra <>
To:     Johannes Weiner <>
Cc:     Suren Baghdasaryan <>,
        Greg Kroah-Hartman <>,
        Tejun Heo <>,,,, Dennis Zhou <>,
        Ingo Molnar <>,
        Andrew Morton <>,
        Jonathan Corbet <>,,
        linux-mm <>,,
        LKML <>,
Subject: Re: [PATCH v2 5/5] psi: introduce psi monitor

On Wed, Jan 16, 2019 at 02:17:28PM -0500, Johannes Weiner wrote:

> > > Also, you probably want to use atomic_t for g->polling, because we
> > > (sadly) have architectures where regular stores and atomic ops don't
> > > work 'right'.
> > 
> > Oh, I see. Will do. Thanks!
> Yikes, that's news to me too. Good to know.

See Documentation/atomic_t.txt, specifically the atomic_set() part in

Archs that suffer this include (but are not limited to): parisc,
sparc32-smp, something arc.

And yes, I would dearly love to kill all SMP support for architectures
like that..

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