From: Peter Zijlstra <peterz@infradead.org>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Suren Baghdasaryan <surenb@google.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Tejun Heo <tj@kernel.org>,
lizefan@huawei.com, axboe@kernel.dk, dennis@kernel.org,
Dennis Zhou <dennisszhou@gmail.com>,
Ingo Molnar <mingo@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Jonathan Corbet <corbet@lwn.net>,
cgroups@vger.kernel.org, linux-mm <linux-mm@kvack.org>,
linux-doc@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
kernel-team@android.com
Subject: Re: [PATCH v2 5/5] psi: introduce psi monitor
Date: Thu, 17 Jan 2019 09:13:14 +0100 [thread overview]
Message-ID: <20190117081314.GD10486@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20190116191728.GA1380@cmpxchg.org>
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
SEMANTICS.
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..
prev parent reply other threads:[~2019-01-17 8:13 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-10 22:07 [PATCH v2 0/5] psi: pressure stall monitors v2 Suren Baghdasaryan
2019-01-10 22:07 ` [PATCH v2 1/5] fs: kernfs: add poll file operation Suren Baghdasaryan
2019-01-11 6:25 ` Greg KH
2019-01-10 22:07 ` [PATCH v2 2/5] kernel: cgroup: " Suren Baghdasaryan
2019-01-10 22:07 ` [PATCH v2 3/5] psi: introduce state_mask to represent stalled psi states Suren Baghdasaryan
2019-01-10 22:07 ` [PATCH v2 4/5] psi: rename psi fields in preparation for psi trigger addition Suren Baghdasaryan
2019-01-10 22:07 ` [PATCH v2 5/5] psi: introduce psi monitor Suren Baghdasaryan
2019-01-14 10:21 ` Peter Zijlstra
2019-01-14 19:30 ` Suren Baghdasaryan
2019-01-14 19:42 ` Johannes Weiner
2019-01-14 20:47 ` Suren Baghdasaryan
2019-01-16 13:24 ` Peter Zijlstra
2019-01-16 17:39 ` Suren Baghdasaryan
2019-01-16 19:17 ` Johannes Weiner
2019-01-16 19:27 ` Johannes Weiner
2019-01-16 21:29 ` Suren Baghdasaryan
2019-01-17 8:13 ` Peter Zijlstra [this message]
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