linux-kernel - Vectored syscalls Was: [PATCH 0/3] readfile(2): a new syscall to make open/read/close faster

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Date:   Wed, 8 Jul 2020 17:16:41 +0200
From:   René Rebe <rene@...ctcode.com>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        viro@...iv.linux.org
Subject: Vectored syscalls Was: [PATCH 0/3] readfile(2): a new syscall to make
 open/read/close faster

Hey there,

maybe instead of this rather specific, niche readfile syscall, would it not be beneficial
to allow issuing any group or bundle of several arbitrary system calls so this could also
be used to speed up other, more demanding high performance applications that need
a bit more than just readfile()?

An iImplementation could use some SYSCALLV syscall taking some io_uring like
structure with a list of flags, syscalls and arguments, so that this case could be submitted
as something like (illustration purposes only):

{
	{ABORT_ON_ERROR, OPEN, …},
	{RET_TO_ARG1, READ, …},
	{0, CLOSE, …},
}

I hope that sounds useful,
	René Rebe

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