Fall back to FP callchain when DWARF unwinding truncates#768
Open
DaniPopes wants to merge 2 commits into
Open
Conversation
Always request PERF_SAMPLE_CALLCHAIN with user frames so the kernel walks the frame pointer chain at sample time with access to the full stack. When DWARF unwinding is truncated (e.g. due to the 32 KB captured stack window), splice in the remaining deeper user frames from the kernel's FP callchain.
DaniPopes
force-pushed
the
dani/fp-callchain-fallback
branch
from
45c625c to
c136824
Compare
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Always request PERF_SAMPLE_CALLCHAIN with user frames so the kernel walks the frame pointer chain at sample time with access to the full stack. When DWARF unwinding is truncated (e.g. due to the 32 KB captured stack window), splice in the remaining deeper user frames from the kernel's FP callchain.
Somewhat overlaps with #736.