linux-kernel - Re: [kernel-team] [PATCH 1/3] staging: Android: vsoc: Create wc kernel mapping for region shm.

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Message-ID: <CAJWu+oof2VRWSeXGjTaP3M8tP4B9=kLw_nLN08bpCprYSYuh0g@mail.gmail.com>
Date:   Thu, 03 May 2018 05:11:42 +0000
From:   Joel Fernandes <joelaf@...gle.com>
To:     Alistair Strachan <astrachan@...gle.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arve Hjonnevag <arve@...roid.com>,
        Todd Kjos <tkjos@...roid.com>, maco@...roid.com,
        ghartman@...gle.com, devel@...verdev.osuosl.org,
        "Cc: Android Kernel" <kernel-team@...roid.com>
Subject: Re: [kernel-team] [PATCH 1/3] staging: Android: vsoc: Create wc
 kernel mapping for region shm.

On Wed, May 2, 2018 at 9:45 PM 'Alistair Strachan' via kernel-team <
kernel-team@...roid.com> wrote:

> Map the region shm as write-combining instead of uncachable.

I think more commit message is needed. Why is this done, what does it fix,
etc. Its hard to know what the improvement is without a cover-letter either.

I am assuming the improvement is in performance by using the
write-combining mode.

thanks,

- Joel