linux-kernel - Re: [PATCH RFC v3 0/7] epoll: Introduce new syscalls, epoll_ctl_batch and epoll

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Date:	Mon, 16 Feb 2015 09:02:24 +0800
From:	Fam Zheng <famz@...hat.com>
To:	Jonathan Corbet <corbet@....net>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	Andy Lutomirski <luto@...capital.net>,
	David Herrmann <dh.herrmann@...il.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Miklos Szeredi <mszeredi@...e.cz>,
	David Drysdale <drysdale@...gle.com>,
	Oleg Nesterov <oleg@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Vivek Goyal <vgoyal@...hat.com>,
	Mike Frysinger <vapier@...too.org>,
	"Theodore Ts'o" <tytso@....edu>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Rashika Kheria <rashika.kheria@...il.com>,
	Hugh Dickins <hughd@...gle.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-fsdevel@...r.kernel.org, linux-api@...r.kernel.org,
	Josh Triplett <josh@...htriplett.org>,
	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Omar Sandoval <osandov@...ndov.com>
Subject: Re: [PATCH RFC v3 0/7] epoll: Introduce new syscalls,
 epoll_ctl_batch and epoll_pwait1

On Sun, 02/15 15:00, Jonathan Corbet wrote:
> On Fri, 13 Feb 2015 17:03:56 +0800
> Fam Zheng <famz@...hat.com> wrote:
> 
> > SYNOPSIS
> > 
> >        #include <sys/epoll.h>
> > 
> >        int epoll_pwait1(int epfd, int flags,
> >                         struct epoll_event *events,
> >                         int maxevents,
> >                         struct epoll_wait_params *params);
> 
> Quick, possibly dumb question: might it make sense to also pass in 
> sizeof(struct epoll_wait_params)?  That way, when somebody wants to add
> another parameter in the future, the kernel can tell which version is in
> use and they won't have to do an epoll_pwait2()?
> 

Flags can be used for that, if the change is not radically different.

Fam
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