Re: [PATCH 0/5] hugetlbfs: Disable PMD sharing for large systems

2019-09-25 Thread Peter Zijlstra
On Fri, Sep 13, 2019 at 11:50:43AM +1000, Dave Chinner wrote: > On Wed, Sep 11, 2019 at 04:05:32PM +0100, Waiman Long wrote: > > A customer with large SMP systems (up to 16 sockets) with application > > that uses large amount of static hugepages (~500-1500GB) are experiencing > > random multisecond

Re: [PATCH 0/5] hugetlbfs: Disable PMD sharing for large systems

2019-09-12 Thread Dave Chinner
On Wed, Sep 11, 2019 at 04:05:32PM +0100, Waiman Long wrote: > A customer with large SMP systems (up to 16 sockets) with application > that uses large amount of static hugepages (~500-1500GB) are experiencing > random multisecond delays. These delays was caused by the long time it > took to scan th

[PATCH 0/5] hugetlbfs: Disable PMD sharing for large systems

2019-09-11 Thread Waiman Long
A customer with large SMP systems (up to 16 sockets) with application that uses large amount of static hugepages (~500-1500GB) are experiencing random multisecond delays. These delays was caused by the long time it took to scan the VMA interval tree with mmap_sem held. To fix this problem while pe