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

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Message-ID: <20171028140533.e3n4zpno66kyfdm3@linux-n805>
Date:   Sat, 28 Oct 2017 07:05:33 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     Jason Baron <jbaron@...mai.com>
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 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?

Thanks,
Davidlohr