linux-kernel - Re: [PATCH] epoll: avoid calling ep_call_nested() from ep_poll

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Message-ID: <2a96ebdd-f24b-23f3-2e53-d04a717c4378@akamai.com>
Date:   Tue, 31 Oct 2017 10:14:47 -0400
From:   Jason Baron <jbaron@...mai.com>
To:     Davidlohr Bueso <dave@...olabs.net>
Cc:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Salman Qazi <sqazi@...gle.com>
Subject: Re: [PATCH] epoll: avoid calling ep_call_nested() from
 ep_poll_safewake()



On 10/28/2017 10:05 AM, Davidlohr Bueso wrote:
> On Wed, 18 Oct 2017, Jason Baron wrote:
> 
>> http://lkml.iu.edu/hypermail//linux/kernel/1501.1/05905.html
>>
>> We can work through these ideas or others...
> 
> So, unsurprisingly, I got some _really_ good results on the epoll_wait()
> benchmark by removing the readywalk list altogether -- something like
> 4000% in some cases. It's also survived more testing, although I'm still
> waiting for customer confirmation on his real workload, which helps
> further test the changes (along with this patch to move the safewake
> list to debug).
> 
> Could you please resend patch 1 in the series above?
> 

Hi,

I've resent patch 1 with some cleanups now. Thanks for the testing feedback.

Thanks,

-Jason