On 01/07/2019 11:33 AM, Alexey Dobriyan wrote:
> On Mon, Jan 07, 2019 at 07:58:40AM -0800, Matthew Wilcox wrote:
>> On Mon, Jan 07, 2019 at 10:12:58AM -0500, Waiman Long wrote:
>>> A new "fs/proc-stat-irqs-latency-ms" sysctl parameter is now added to
>> No. No, no, no, no, no. No.
>>
>> Stop addi
On Mon, Jan 07, 2019 at 07:58:40AM -0800, Matthew Wilcox wrote:
> On Mon, Jan 07, 2019 at 10:12:58AM -0500, Waiman Long wrote:
> > A new "fs/proc-stat-irqs-latency-ms" sysctl parameter is now added to
>
> No. No, no, no, no, no. No.
>
> Stop adding new sysctls for this kind of thing. It's jus
On 01/07/2019 11:14 AM, Matthew Wilcox wrote:
> On Mon, Jan 07, 2019 at 11:07:47AM -0500, Waiman Long wrote:
>>> Why are you caching the _output_ of calling sprintf(), rather than caching
>>> the
>>> values of each interrupt?
>>>
>> It is just faster to dump the whole string buffer than redoing th
On Mon, Jan 07, 2019 at 11:07:47AM -0500, Waiman Long wrote:
> > Why are you caching the _output_ of calling sprintf(), rather than caching
> > the
> > values of each interrupt?
> >
> It is just faster to dump the whole string buffer than redoing the
> number formatting each time when the values d
On 01/07/2019 10:58 AM, Matthew Wilcox wrote:
> On Mon, Jan 07, 2019 at 10:12:58AM -0500, Waiman Long wrote:
>> Reading /proc/stat can be slow especially if there are many irqs and on
>> systems with many CPUs as summation of all the percpu counts for each
>> of the irqs is required. On some newer
On Mon, Jan 07, 2019 at 10:12:58AM -0500, Waiman Long wrote:
> Reading /proc/stat can be slow especially if there are many irqs and on
> systems with many CPUs as summation of all the percpu counts for each
> of the irqs is required. On some newer systems, there can be more than
> 1000 irqs per soc
Reading /proc/stat can be slow especially if there are many irqs and on
systems with many CPUs as summation of all the percpu counts for each
of the irqs is required. On some newer systems, there can be more than
1000 irqs per socket.
Applications that need to read /proc/stat many times per second
