From mboxrd@z Thu Jan  1 00:00:00 1970
From: Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [PATCH v3 3/5] psi: introduce state_mask to represent stalled
 psi states
Date: Mon, 28 Jan 2019 16:22:08 -0500
Message-ID: <20190128212208.GA1416@cmpxchg.org>
References: <20190124211518.244221-1-surenb@google.com>
 <20190124211518.244221-4-surenb@google.com>
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To: Suren Baghdasaryan <surenb@google.com>
Cc: gregkh@linuxfoundation.org, tj@kernel.org, lizefan@huawei.com, axboe@kernel.dk, dennis@kernel.org, dennisszhou@gmail.com, mingo@redhat.com, peterz@infradead.org, akpm@linux-foundation.org, corbet@lwn.net, cgroups@vger.kernel.org, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@android.com

On Thu, Jan 24, 2019 at 01:15:16PM -0800, Suren Baghdasaryan wrote:
> The psi monitoring patches will need to determine the same states as
> record_times(). To avoid calculating them twice, maintain a state mask
> that can be consulted cheaply. Do this in a separate patch to keep the
> churn in the main feature patch at a minimum.
> This adds 4-byte state_mask member into psi_group_cpu struct which
> results in its first cacheline-aligned part to become 52 bytes long.
> Add explicit values to enumeration element counters that affect
> psi_group_cpu struct size.
> 
> Signed-off-by: Suren Baghdasaryan <surenb@google.com>

Acked-by: Johannes Weiner <hannes@cmpxchg.org>