linux-kernel - Re: [PATCH v2 1/5] fs: kernfs: add poll file operation

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Date:   Fri, 11 Jan 2019 07:25:56 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Suren Baghdasaryan <surenb@...gle.com>
Cc:     tj@...nel.org, lizefan@...wei.com, hannes@...xchg.org,
        axboe@...nel.dk, dennis@...nel.org, dennisszhou@...il.com,
        mingo@...hat.com, peterz@...radead.org, akpm@...ux-foundation.org,
        corbet@....net, cgroups@...r.kernel.org, linux-mm@...ck.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...roid.com
Subject: Re: [PATCH v2 1/5] fs: kernfs: add poll file operation

On Thu, Jan 10, 2019 at 02:07:14PM -0800, Suren Baghdasaryan wrote:
> From: Johannes Weiner <hannes@...xchg.org>
> 
> Kernfs has a standardized poll/notification mechanism for waking all
> pollers on all fds when a filesystem node changes. To allow polling
> for custom events, add a .poll callback that can override the default.
> 
> This is in preparation for pollable cgroup pressure files which have
> per-fd trigger configurations.
> 
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>
> Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>

Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>