On Mon, 9 Apr 2007 11:25:09 -0700 (PDT)
Christoph Lameter <[email protected]> wrote:
> On x86_64 this cuts allocation overhead for page table pages down to
> a fraction (kernel compile / editing load. TSC based measurement
> of times spend in each function):
>
> no quicklist
>
> pte_alloc 1569048 4.3s(401ns/2.7us/179.7us)
> pmd_alloc 780988 2.1s(337ns/2.7us/86.1us)
> pud_alloc 780072 2.2s(424ns/2.8us/300.6us)
> pgd_alloc 260022 1s(920ns/4us/263.1us)
>
> quicklist:
>
> pte_alloc 452436 573.4ms(8ns/1.3us/121.1us)
> pmd_alloc 196204 174.5ms(7ns/889ns/46.1us)
> pud_alloc 195688 172.4ms(7ns/881ns/151.3us)
> pgd_alloc 65228 9.8ms(8ns/150ns/6.1us)
>
> pgd allocations are the most complex and there we see the most dramatic
> improvement (may be we can cut down the amount of pgds cached somewhat?).
> But even the pte allocations still see a doubling of performance.
Was there any observeable change in overall runtime?
What are the numbers in parentheses?
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