linux-kernel - Re: [RFC][v6][PATCH 0/9] clone_with

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Message-ID: <20090911164703.GA29169@us.ibm.com>
Date:	Fri, 11 Sep 2009 09:47:03 -0700
From:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, Oren Laadan <orenl@...columbia.edu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Andrew Morton <akpm@...l.org>, torvalds@...ux-foundation.org,
	mikew@...gle.com, mingo@...e.hu, hpa@...or.com,
	Nathan Lynch <nathanl@...tin.ibm.com>, container@...ibm.com,
	sukadev@...ibm.com
Subject: Re: [RFC][v6][PATCH 0/9] clone_with_pids() syscall

| Also, if you're passing a struct, why not put nr_pids in there, and
| replace clone_pid_struct with a simple array? That would give us
| 
| struct clone_struct {
|         u64 flags;
|         u64 child_stack;
|         u32 child_tid;
|         u32 parent_tid;
| 	u32 nr_pids;
| 	u32 reserved1;
| 	u64 reserved2;
| };
| 
| int clone2(struct clone_struct *cs, pid_t *pids);

My only concern with this approach was the extra copy_from_user() in the
common case (i.e when not using the extended features).  I assume the
overhead of copy_from_user() is small enough to be ignored ?

Thanks,

Sukadev
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