On 10/29/2015 12:23 AM, Will Deacon wrote:
On Thu, Oct 08, 2015 at 07:01:37PM +0900, AKASHI Takahiro wrote:
This is the third patch series for fixing stack tracer on arm64.
The original issue was reported by Jungseok[1], and then I found more
issues[2].
(Steven, Jungseok, sorry for not replying to your comments directly.)
I address here all the issues and implement fixes described in [2] except
for interrupt-triggered problems, ie. II-3). Recent discussions[3] about
introducing a dedicated interrupt stack suggests that we may avoid walking
through from an interrupt stack to a process stack.
(So interrupt-stack patch is a prerequisite.)
Basically,
patch1 corresponds to the original issue.
patch2 is a proactive improvement of function_graph tracer.
patch3 corresponds to II-4(functions under function_graph tracer).
patch4 corresponds to II-5(leaf function).
patch5, 6 and 7 correspond to II-1(slurping stack) and II-2(differences
between x86 and arm64).
Each fix can be applied independently, but if patch5, 6 and 7 are
acceptable, patch1 is not necessary because patch7 replaces a default
stack tracer.
Given the comments and kbuild robot build errors, do you plan to post a
new version of this series?
Yes, I do.
Do you have any comments that I should address before submitting a new version?
Apart from build errors, I admit that I should drop patch #4 ("arm64: ftrace:
allow for tracing leaf functions") just because I was somewhat confused.
I confirmed that "-pg" option actually disables omit-leaf-stack-frame.
Thanks,
-Takahiro AKASHI
Will
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