Re: [PATCH v2 0/2] send tlb_remove_table_smp_sync IPI only to necessary CPUs

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Tue, Jun 20, 2023 at 05:46:16PM +0300, Yair Podemsky wrote:
> Currently the tlb_remove_table_smp_sync IPI is sent to all CPUs
> indiscriminately, this causes unnecessary work and delays notable in
> real-time use-cases and isolated cpus.
> By limiting the IPI to only be sent to cpus referencing the effected
> mm.
> a config to differentiate architectures that support mm_cpumask from
> those that don't will allow safe usage of this feature.
> 
> changes from -v1:
> - Previous version included a patch to only send the IPI to CPU's with
> context_tracking in the kernel space, this was removed due to race 
> condition concerns.
> - for archs that do not maintain mm_cpumask the mask used should be
>  cpu_online_mask (Peter Zijlstra).
>  

Would it not be much better to fix the root cause? As per the last time,
there's patches that cure the thp abuse of this.



[Index of Archives]     [Linux Kernel]     [Kernel Newbies]     [x86 Platform Driver]     [Netdev]     [Linux Wireless]     [Netfilter]     [Bugtraq]     [Linux Filesystems]     [Yosemite Discussion]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Device Mapper]

  Powered by Linux