Il 08/04/2013 11:25, Peter Lieven ha scritto:
>> > Actually we can use mmap+munmap to allocate a well-aligned, always zero
>> > block for the RAM.
> like this?
This doesn't align it. I'll send a patch shortly.
Paolo
Am 08.04.2013 um 10:38 schrieb Paolo Bonzini :
> Il 06/04/2013 00:06, Peter Lieven ha scritto:
I think we should MADV_DONTNEED it.
>> i have to correct myself, on Linux it seems that MADV_DONTNEED guarantees
>> that
>> subsequent reads will return a zero filled page.
>>
>> If I am right wi
Am 08.04.2013 um 10:49 schrieb Kevin Wolf :
> Am 08.04.2013 um 10:33 hat Peter Lieven geschrieben:
>>
>> Am 05.04.2013 um 21:23 schrieb Kevin Wolf :
>>
>>> Am 26.03.2013 um 10:58 hat Peter Lieven geschrieben:
virtually all dup pages are zero pages. remove
the special is_dup_page() fun
Am 08.04.2013 um 10:33 hat Peter Lieven geschrieben:
>
> Am 05.04.2013 um 21:23 schrieb Kevin Wolf :
>
> > Am 26.03.2013 um 10:58 hat Peter Lieven geschrieben:
> >> virtually all dup pages are zero pages. remove
> >> the special is_dup_page() function and use the
> >> optimized buffer_find_nonzer
Am 08.04.2013 um 10:33 schrieb Peter Lieven :
>
> Am 05.04.2013 um 21:23 schrieb Kevin Wolf :
>
>> Am 26.03.2013 um 10:58 hat Peter Lieven geschrieben:
>>> virtually all dup pages are zero pages. remove
>>> the special is_dup_page() function and use the
>>> optimized buffer_find_nonzero_offset()
Il 06/04/2013 00:06, Peter Lieven ha scritto:
>> > I think we should MADV_DONTNEED it.
> i have to correct myself, on Linux it seems that MADV_DONTNEED guarantees that
> subsequent reads will return a zero filled page.
>
> If I am right with that we could MADV_DONTNEED the memory on startup and ke
Am 05.04.2013 um 21:23 schrieb Kevin Wolf :
> Am 26.03.2013 um 10:58 hat Peter Lieven geschrieben:
>> virtually all dup pages are zero pages. remove
>> the special is_dup_page() function and use the
>> optimized buffer_find_nonzero_offset() function
>> instead.
>>
>> here buffer_find_nonzero_off
Am 05.04.2013 um 22:00 schrieb Paolo Bonzini :
> Il 05/04/2013 21:23, Kevin Wolf ha scritto:
virtually all dup pages are zero pages. remove
the special is_dup_page() function and use the
optimized buffer_find_nonzero_offset() function
instead.
here buffer_find_nonze
Am 05.04.2013 um 22:00 schrieb Paolo Bonzini :
> Il 05/04/2013 21:23, Kevin Wolf ha scritto:
virtually all dup pages are zero pages. remove
the special is_dup_page() function and use the
optimized buffer_find_nonzero_offset() function
instead.
here buffer_find_nonze
Il 05/04/2013 21:23, Kevin Wolf ha scritto:
>> > virtually all dup pages are zero pages. remove
>> > the special is_dup_page() function and use the
>> > optimized buffer_find_nonzero_offset() function
>> > instead.
>> >
>> > here buffer_find_nonzero_offset() is used directly
>> > to avoid the unne
Am 26.03.2013 um 10:58 hat Peter Lieven geschrieben:
> virtually all dup pages are zero pages. remove
> the special is_dup_page() function and use the
> optimized buffer_find_nonzero_offset() function
> instead.
>
> here buffer_find_nonzero_offset() is used directly
> to avoid the unnecssary addit
virtually all dup pages are zero pages. remove
the special is_dup_page() function and use the
optimized buffer_find_nonzero_offset() function
instead.
here buffer_find_nonzero_offset() is used directly
to avoid the unnecssary additional checks in
buffer_is_zero().
raw performace gain checking 1 G
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