Re: [PATCH v3 02/15] x86/dumpstack: Add save_stack_trace()_fast()

2016-09-13 Thread Josh Poimboeuf
On Tue, Sep 13, 2016 at 06:45:01PM +0900, Byungchul Park wrote: > In non-oops case, it's usually not necessary to check all words of stack > area to extract backtrace. Instead, we can achieve it by tracking frame > pointer. So made it possible to save stack trace lightly in normal case. > > I meas

[PATCH v3 02/15] x86/dumpstack: Add save_stack_trace()_fast()

2016-09-13 Thread Byungchul Park
In non-oops case, it's usually not necessary to check all words of stack area to extract backtrace. Instead, we can achieve it by tracking frame pointer. So made it possible to save stack trace lightly in normal case. I measured its ovehead and printed its difference of sched_clock() with my QEMU