Re: [PATCH 28/41] mm: introduce lock_vma_under_rcu to be used from arch-specific code

2023-01-18 Thread Suren Baghdasaryan
On Tue, Jan 17, 2023 at 6:44 PM Matthew Wilcox wrote: > > On Tue, Jan 17, 2023 at 05:06:57PM -0800, Suren Baghdasaryan wrote: > > On Tue, Jan 17, 2023 at 7:47 AM Michal Hocko wrote: > > > > > > On Mon 09-01-23 12:53:23, Suren Baghdasaryan wrote: > > > > Introduce lock_vma_under_rcu function to lo

Re: [PATCH 28/41] mm: introduce lock_vma_under_rcu to be used from arch-specific code

2023-01-17 Thread Matthew Wilcox
On Tue, Jan 17, 2023 at 05:06:57PM -0800, Suren Baghdasaryan wrote: > On Tue, Jan 17, 2023 at 7:47 AM Michal Hocko wrote: > > > > On Mon 09-01-23 12:53:23, Suren Baghdasaryan wrote: > > > Introduce lock_vma_under_rcu function to lookup and lock a VMA during > > > page fault handling. When VMA is n

Re: [PATCH 28/41] mm: introduce lock_vma_under_rcu to be used from arch-specific code

2023-01-17 Thread Suren Baghdasaryan
On Tue, Jan 17, 2023 at 7:47 AM Michal Hocko wrote: > > On Mon 09-01-23 12:53:23, Suren Baghdasaryan wrote: > > Introduce lock_vma_under_rcu function to lookup and lock a VMA during > > page fault handling. When VMA is not found, can't be locked or changes > > after being locked, the function retu

Re: [PATCH 28/41] mm: introduce lock_vma_under_rcu to be used from arch-specific code

2023-01-17 Thread Liam Howlett
* Jann Horn [230117 16:04]: > On Mon, Jan 9, 2023 at 9:54 PM Suren Baghdasaryan wrote: > > Introduce lock_vma_under_rcu function to lookup and lock a VMA during > > page fault handling. When VMA is not found, can't be locked or changes > > after being locked, the function returns NULL. The lookup

Re: [PATCH 28/41] mm: introduce lock_vma_under_rcu to be used from arch-specific code

2023-01-17 Thread Jann Horn
On Mon, Jan 9, 2023 at 9:54 PM Suren Baghdasaryan wrote: > Introduce lock_vma_under_rcu function to lookup and lock a VMA during > page fault handling. When VMA is not found, can't be locked or changes > after being locked, the function returns NULL. The lookup is performed > under RCU protection

Re: [PATCH 28/41] mm: introduce lock_vma_under_rcu to be used from arch-specific code

2023-01-17 Thread Michal Hocko
On Mon 09-01-23 12:53:23, Suren Baghdasaryan wrote: > Introduce lock_vma_under_rcu function to lookup and lock a VMA during > page fault handling. When VMA is not found, can't be locked or changes > after being locked, the function returns NULL. The lookup is performed > under RCU protection to pre

[PATCH 28/41] mm: introduce lock_vma_under_rcu to be used from arch-specific code

2023-01-09 Thread Suren Baghdasaryan
Introduce lock_vma_under_rcu function to lookup and lock a VMA during page fault handling. When VMA is not found, can't be locked or changes after being locked, the function returns NULL. The lookup is performed under RCU protection to prevent the found VMA from being destroyed before the VMA lock