From: Al Viro
> Sent: 31 August 2020 04:21
>
> On Mon, Aug 31, 2020 at 09:43:31AM +0800, Shaokun Zhang wrote:
>
> > How about this? We try to replace atomic_cmpxchg with atomic_add to improve
> > performance. The atomic_add does not check the current f_count value.
> > Therefore, the number of on
On Mon, Aug 31, 2020 at 09:43:31AM +0800, Shaokun Zhang wrote:
> How about this? We try to replace atomic_cmpxchg with atomic_add to improve
> performance. The atomic_add does not check the current f_count value.
> Therefore, the number of online CPUs is reserved to prevent multi-core
> competitio
Hi Al,
在 2020/8/27 22:28, Al Viro 写道:
> On Thu, Aug 27, 2020 at 06:19:44PM +0800, Shaokun Zhang wrote:
>> From: Yuqi Jin
>>
>> It is well known that the performance of atomic_add is better than that of
>> atomic_cmpxchg.
>> The initial value of @f_count is 1. While @f_count is increased by 1 in
>
On Thu, Aug 27, 2020 at 03:28:48PM +0100, Al Viro wrote:
> On Thu, Aug 27, 2020 at 06:19:44PM +0800, Shaokun Zhang wrote:
> > From: Yuqi Jin
> >
> > It is well known that the performance of atomic_add is better than that of
> > atomic_cmpxchg.
> > The initial value of @f_count is 1. While @f_coun
From: Matthew Wilcox
> Sent: 27 August 2020 13:31
> On Thu, Aug 27, 2020 at 06:19:44PM +0800, Shaokun Zhang wrote:
> > From: Yuqi Jin
> >
> > It is well known that the performance of atomic_add is better than that of
> > atomic_cmpxchg.
>
> I don't think that's well-known at all.
Especially sinc
On Thu, Aug 27, 2020 at 06:19:44PM +0800, Shaokun Zhang wrote:
> From: Yuqi Jin
>
> It is well known that the performance of atomic_add is better than that of
> atomic_cmpxchg.
> The initial value of @f_count is 1. While @f_count is increased by 1 in
> __fget_files, it will go through three phase
On Thu, Aug 27, 2020 at 06:19:44PM +0800, Shaokun Zhang wrote:
> From: Yuqi Jin
>
> It is well known that the performance of atomic_add is better than that of
> atomic_cmpxchg.
I don't think that's well-known at all.
> +static inline bool get_file_unless_negative(atomic_long_t *v, long a)
> +{
From: Yuqi Jin
It is well known that the performance of atomic_add is better than that of
atomic_cmpxchg.
The initial value of @f_count is 1. While @f_count is increased by 1 in
__fget_files, it will go through three phases: > 0, < 0, and = 0. When the
fixed value 0 is used as the condition for t
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