在 2020/8/31 上午4:32, Alexander Duyck 写道:
>> Right that the different level to fix this problem, but narrow the cmpxchg
>> comparsion is still needed and helpful.
> What I was getting at though is that I am not sure that is the case.
> Normally I believe we are always holding the zone lock when
On 8/19/20 10:09 AM, Alex Shi wrote:
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> 在 2020/8/19 下午3:57, Anshuman Khandual 写道:
>>
>>
>> On 08/19/2020 11:17 AM, Alex Shi wrote:
>>> Current pageblock_flags is only 4 bits, so it has to share a char size
>>> in cmpxchg when get set, the false sharing cause perf drop.
>>>
>>> If we incrase
On Sun, Aug 30, 2020 at 3:00 AM Alex Shi wrote:
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> 在 2020/8/20 上午12:50, Alexander Duyck 写道:
> > On Wed, Aug 19, 2020 at 1:11 AM Alex Shi wrote:
> >>
> >>
> >>
> >> 在 2020/8/19 下午3:57, Anshuman Khandual 写道:
> >>>
> >>>
> >>> On 08/19/2020 11:17 AM, Alex Shi wrote:
> Current
在 2020/8/20 上午12:50, Alexander Duyck 写道:
> On Wed, Aug 19, 2020 at 1:11 AM Alex Shi wrote:
>>
>>
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>> 在 2020/8/19 下午3:57, Anshuman Khandual 写道:
>>>
>>>
>>> On 08/19/2020 11:17 AM, Alex Shi wrote:
Current pageblock_flags is only 4 bits, so it has to share a char size
in cmpxchg when
On Wed, Aug 19, 2020 at 1:11 AM Alex Shi wrote:
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>
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> 在 2020/8/19 下午3:57, Anshuman Khandual 写道:
> >
> >
> > On 08/19/2020 11:17 AM, Alex Shi wrote:
> >> Current pageblock_flags is only 4 bits, so it has to share a char size
> >> in cmpxchg when get set, the false sharing cause perf drop.
> >>
>
在 2020/8/19 下午4:13, David Hildenbrand 写道:
> On 19.08.20 10:09, Alex Shi wrote:
>>
>>
>> 在 2020/8/19 下午3:57, Anshuman Khandual 写道:
>>>
>>>
>>> On 08/19/2020 11:17 AM, Alex Shi wrote:
Current pageblock_flags is only 4 bits, so it has to share a char size
in cmpxchg when get set, the
On 19.08.20 10:09, Alex Shi wrote:
>
>
> 在 2020/8/19 下午3:57, Anshuman Khandual 写道:
>>
>>
>> On 08/19/2020 11:17 AM, Alex Shi wrote:
>>> Current pageblock_flags is only 4 bits, so it has to share a char size
>>> in cmpxchg when get set, the false sharing cause perf drop.
>>>
>>> If we incrase the
在 2020/8/19 下午3:57, Anshuman Khandual 写道:
>
>
> On 08/19/2020 11:17 AM, Alex Shi wrote:
>> Current pageblock_flags is only 4 bits, so it has to share a char size
>> in cmpxchg when get set, the false sharing cause perf drop.
>>
>> If we incrase the bits up to 8, false sharing would gone in
On 08/19/2020 11:17 AM, Alex Shi wrote:
> Current pageblock_flags is only 4 bits, so it has to share a char size
> in cmpxchg when get set, the false sharing cause perf drop.
>
> If we incrase the bits up to 8, false sharing would gone in cmpxchg. and
> the only cost is half char per
Current pageblock_flags is only 4 bits, so it has to share a char size
in cmpxchg when get set, the false sharing cause perf drop.
If we incrase the bits up to 8, false sharing would gone in cmpxchg. and
the only cost is half char per pageblock, which is half char per 128MB
on x86, 4 chars in 1
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