linux-kernel - Re: [PATCH 5.4 024/138] dm mpath: pass IO start time to path selector

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Message-ID: <87wo2oudb4.fsf@collabora.com>
Date:   Mon, 27 Jul 2020 12:34:39 -0400
From:   Gabriel Krisman Bertazi <krisman@...labora.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Mike Snitzer <snitzer@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 5.4 024/138] dm mpath: pass IO start time to path selector

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

> From: Gabriel Krisman Bertazi <krisman@...labora.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