Re: ipc,sem: sysv semaphore scalability

[Sasha Levin]

On 04/02/2013 01:52 PM, Linus Torvalds wrote:
> On Tue, Apr 2, 2013 at 9:08 AM, Sasha Levin <sasha.levin@xxxxxxxxxx> wrote:
>>
>> By just playing with the 'msgsz' parameter with MSG_COPY set.
> 
> Hmm. Looking closer, I suspect you're testing without commit
> 88b9e456b164 ("ipc: don't allocate a copy larger than max"). That
> should limit the size passed in to prepare_copy -> load_copy to
> msg_ctlmax.

That commit has a revert in the -next trees, do we need a revert
of the revert?

	commit ff6577a3e714ccae02d4400e989762c19c37b0b3
	Author: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
	Date:   Wed Mar 27 10:24:02 2013 +1100
	
	    revert "ipc: don't allocate a copy larger than max"
	
	    Revert 88b9e456b164.  Dave has confirmed that this was causing oopses
	    during trinity testing.
	
	    Cc: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
	    Cc: Stanislav Kinsbursky <skinsbursky@xxxxxxxxxxxxx>
	    Reported-by: Dave Jones <davej@xxxxxxxxxx>
	    Cc: <stable@xxxxxxxxxxxxxxx>
	    Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>



Thanks,
Sasha
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