Messages in this thread | | | Date | Mon, 9 Apr 2007 10:22:24 -0700 (PDT) | From | Christoph Lameter <> | Subject | Re: [PATCH 2/2] Optimize compound_head() by avoiding a shared page flag |
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On Sat, 7 Apr 2007, Andrew Morton wrote:
> andl $48, %eax #, tmp399 > cmpl $48, %eax #, tmp399 > je .L265 #, > > what's "yuck" about that?
> > With the single page flag: > > movl (%ebx), %eax #* page.521, D.21940 > testb $32, %al #, D.21940 > jne .L265 #, > > So you're talking about saving one sole single silly solitary instruction.
We are also using another register. The bit instructions can just go in an test. Ok. Will submit this patch. .... Maybe I can special case 64 bit.
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