linux-kernel - Re: [PATCH v5 13/14] epoll: implement epoll

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Message-ID: <20190625182920.abpecnwxdjdg7sjl@dcvr>
Date:   Tue, 25 Jun 2019 18:29:20 +0000
From:   Eric Wong <e@...24.org>
To:     Roman Penyaev <rpenyaev@...e.de>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 13/14] epoll: implement epoll_create2() syscall

Roman Penyaev <rpenyaev@...e.de> wrote:
> epoll_create2() is needed to accept EPOLL_USERPOLL flags
> and size, i.e. this patch wires up polling from userspace.

Instead of adding a new syscall, is setting size (and/or even
the EPOLL_USEREPOLL flag) something that could be done via
ioctl?

There's no race like CLOEXEC to worry about and it's not
going to be in a hot path where the extra syscall matters.

glibc won't need to increase in .so size, either.