linux-kernel - Re: [PATCH?] uprobes: change uprobe_write

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Message-ID: <529E3D4C.9070403@zytor.com>
Date:	Tue, 03 Dec 2013 12:21:32 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Oleg Nesterov <oleg@...hat.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Kosina <jkosina@...e.cz>,
	Andi Kleen <andi@...stfloor.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH?] uprobes: change uprobe_write_opcode() to modify the
 page directly

On 12/03/2013 12:01 PM, Oleg Nesterov wrote:
> 
>> followed by whatever synchronization necessary to make it globally visible.
> 
> Could you explain what this synchronization should actually do ?
> 

That is architecture-dependent.  On x86 it requires each CPU on which
this code is visible to be IPId, on others it involves complex icache
flushing protocols.

	-hpa


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