linux-kernel - Re: [PATCH v2 2/3] blkcg: introduce io.sync

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Message-ID: <20190307221125.hy2j76m6tv7vnjpr@macbook-pro-91.dhcp.thefacebook.com>
Date:   Thu, 7 Mar 2019 17:11:27 -0500
From:   Josef Bacik <josef@...icpanda.com>
To:     Andrea Righi <andrea.righi@...onical.com>
Cc:     Josef Bacik <josef@...icpanda.com>, Tejun Heo <tj@...nel.org>,
        Li Zefan <lizefan@...wei.com>,
        Paolo Valente <paolo.valente@...aro.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Jens Axboe <axboe@...nel.dk>, Vivek Goyal <vgoyal@...hat.com>,
        Dennis Zhou <dennis@...nel.org>, cgroups@...r.kernel.org,
        linux-block@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] blkcg: introduce io.sync_isolation

On Thu, Mar 07, 2019 at 07:08:33PM +0100, Andrea Righi wrote:
> Add a flag to the blkcg cgroups to make sync()'ers in a cgroup only be
> allowed to write out pages that have been dirtied by the cgroup itself.
> 
> This flag is disabled by default (meaning that we are not changing the
> previous behavior by default).
> 
> When this flag is enabled any cgroup can write out only dirty pages that
> belong to the cgroup itself (except for the root cgroup that would still
> be able to write out all pages globally).
> 
> Signed-off-by: Andrea Righi <andrea.righi@...onical.com>

Reviewed-by: Josef Bacik <josef@...icpanda.com>

Thanks,

Josef