Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Gabriel Krisman Bertazi <krisman@collabora.com>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     linux-kernel@vger.kernel.org, stable@vger.kernel.org,
        Mike Snitzer <snitzer@redhat.com>,
        Sasha Levin <sashal@kernel.org>
Subject: Re: [PATCH 5.7 024/179] dm mpath: pass IO start time to path selector
Organization: Collabora
References: <20200727134932.659499757@linuxfoundation.org>
        <20200727134933.846667790@linuxfoundation.org>
Date:   Mon, 27 Jul 2020 12:35:13 -0400
In-Reply-To: <20200727134933.846667790@linuxfoundation.org> (Greg
        Kroah-Hartman's message of "Mon, 27 Jul 2020 16:03:19 +0200")
Message-ID: <87sgdcuda6.fsf@collabora.com>
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux)
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Greg Kroah-Hartman <gregkh@linuxfoundation.org> writes:

> From: Gabriel Krisman Bertazi <krisman@collabora.com>
>
> [ Upstream commit 087615bf3acdafd0ba7c7c9ed5286e7b7c80fe1b ]
>
> The HST path selector needs this information to perform path
> prediction. For request-based mpath, struct request's io_start_time_ns
> is used, while for bio-based, use the start_time stored in dm_io.

Hi Greg,

This patch is not -stable material.  It is only needed for a new feature
merged in 5.8.

Thanks,

-- 
Gabriel Krisman Bertazi