Re: [PATCH] mm: page_owner: detect page_owner recursion via task_struct

On 4/2/21 1:50 PM, Sergei Trofimovich wrote: > On Thu, 1 Apr 2021 17:05:19 -0700 > Andrew Morton wrote: > >> On Thu, 1 Apr 2021 23:30:10 +0100 Sergei Trofimovich >> wrote: >> >> > Before the change page_owner recursion was detected via fetching >> > backtrace and inspecting it for current

Re: [PATCH] mm: page_owner: detect page_owner recursion via task_struct

On Thu, 1 Apr 2021 17:05:19 -0700 Andrew Morton wrote: > On Thu, 1 Apr 2021 23:30:10 +0100 Sergei Trofimovich > wrote: > > > Before the change page_owner recursion was detected via fetching > > backtrace and inspecting it for current instruction pointer. > > It has a few problems: > > - it

Re: [PATCH] mm: page_owner: detect page_owner recursion via task_struct

On Thu, 1 Apr 2021 23:30:10 +0100 Sergei Trofimovich wrote: > Before the change page_owner recursion was detected via fetching > backtrace and inspecting it for current instruction pointer. > It has a few problems: > - it is slightly slow as it requires extra backtrace and a linear > stack

[PATCH] mm: page_owner: detect page_owner recursion via task_struct

Before the change page_owner recursion was detected via fetching backtrace and inspecting it for current instruction pointer. It has a few problems: - it is slightly slow as it requires extra backtrace and a linear stack scan of the result - it is too late to check if backtrace fetching required