linux-kernel - Re: [PATCH] staging/android: use multiple futex wait queues

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Message-ID: <20190216204627.GA2173@behemoth.owl.eu.com.local>
Date:   Sat, 16 Feb 2019 21:46:27 +0100
From:   Hugo Lefeuvre <hle@....eu.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     devel@...verdev.osuosl.org, Todd Kjos <tkjos@...roid.com>,
        Greg Hartman <ghartman@...gle.com>,
        Alistair Strachan <astrachan@...gle.com>,
        linux-kernel@...r.kernel.org,
        Arve Hjønnevåg <arve@...roid.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Martijn Coenen <maco@...roid.com>,
        Christian Brauner <christian@...uner.io>
Subject: Re: [PATCH] staging/android: use multiple futex wait queues

Hi,

> Have you tested this?

I have finally set up a cuttlefish test env and tested both my first
patch set[0] and this patch (v2).

My first patch set works fine. I have nothing to say about it.

> Noticed any performance speedups or slow downs?

This patch doesn't work.

The boot process goes well. Overall, calls to vsoc_cond_wake are executed
slightly faster. However the system freezes at some point.

The graphical interface generates many calls to vsoc_cond_wake and wait,
so I suspect an issue with the locks. I will investigate this and come back
with an updated patch.

regards,
 Hugo

[0] https://lore.kernel.org/patchwork/patch/1039712/

-- 
                Hugo Lefeuvre (hle)    |    www.owl.eu.com
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