linux-kernel - Re: [PATCH resend] cpumask: don't perform while loop in cpumask_next

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Message-ID: <20150615143352.GB538@swordfish>
Date:	Mon, 15 Jun 2015 23:33:52 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Amir Vadai <amirv@...lanox.com>, linux-kernel@...r.kernel.org,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [PATCH resend] cpumask: don't perform while loop in
 cpumask_next_and()

On (06/15/15 15:40), Borislav Petkov wrote:
[..]
> 
> That's some fat stack with 8K CPUs:
> 
> cpumask_next_and:
>         pushq   %rbp    #
>         movq    %rsp, %rbp      #,
>         pushq   %rbx    #
>         movl    %edi, %ebx      # n, n
>         leaq    -1040(%rbp), %rdi       #, tmp106
>         subq    $1032, %rsp     #,
> 		^^^^^
> 
> Lovely.
>

Oh, wow, 8K cpus...

No excuse.

	-ss
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