linux-kernel - Re: [PATCH RFC v2 0/7] epoll: Introduce new syscalls, epoll_ctl_batch and epoll

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Date:	Wed, 4 Feb 2015 13:38:09 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Fam Zheng <famz@...hat.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, X86 ML <x86@...nel.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	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 FS Devel <linux-fsdevel@...r.kernel.org>,
	Linux API <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 v2 0/7] epoll: Introduce new syscalls, epoll_ctl_batch
 and epoll_pwait1

On Wed, Feb 4, 2015 at 2:36 AM, Fam Zheng <famz@...hat.com> wrote:
> 2) epoll_pwait1
> ---------------
>
> NAME
>        epoll_pwait1 - wait for an I/O event on an epoll file descriptor
>
> SYNOPSIS
>
>        #include <sys/epoll.h>
>
>        int epoll_pwait1(int epfd, int flags,
>                         struct epoll_event *events,
>                         int maxevents,
>                         struct timespec *timeout,
>                         struct sigargs *sig);
>
> DESCRIPTION
>
>        The epoll_pwait1 system call differs from epoll_pwait only in parameter
>        types. The first difference is timeout, a pointer to timespec structure
>        which allows nanosecond presicion; the second difference, which should
>        probably be wrapper by glibc and only expose a sigset_t pointer as in
>        pselect6.
>
>        If timeout is NULL, it's treated as if 0 is specified in epoll_pwait
>        (return immediately). Otherwise it's converted to nanosecond scalar,
>        again, with the same convention as epoll_pwait's timeout.

Is the timeout absolute or relative?

I'd kind of like the ability to set timeouts on multiple clocks at the
same time, but I can live without that.

--Andy

>
> RETURN VALUE
>
>        The same as said in epoll_pwait(2).
>
> ERRORS
>
>        The same as said in man epoll_pwait(2), plus:
>
>        EINVAL flags is not zero.
>
>
> CONFORMING TO
>
>        epoll_pwait1() is Linux-specific.
>
> SEE ALSO
>
>        epoll_create(2), epoll_ctl(2), epoll_wait(2), epoll_pwait(2), epoll(7)
>
> Fam Zheng (7):
>   epoll: Extract epoll_wait_do and epoll_pwait_do
>   epoll: Specify clockid explicitly
>   epoll: Extract ep_ctl_do
>   epoll: Add implementation for epoll_ctl_batch
>   x86: Hook up epoll_ctl_batch syscall
>   epoll: Add implementation for epoll_pwait1
>   x86: Hook up epoll_pwait1 syscall
>
>  arch/x86/syscalls/syscall_32.tbl |   2 +
>  arch/x86/syscalls/syscall_64.tbl |   2 +
>  fs/eventpoll.c                   | 241 ++++++++++++++++++++++++++-------------
>  include/linux/syscalls.h         |   9 ++
>  include/uapi/linux/eventpoll.h   |  11 ++
>  5 files changed, 186 insertions(+), 79 deletions(-)
>
> --
> 1.9.3
>



-- 
Andy Lutomirski
AMA Capital Management, LLC
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