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Bug 1727618 - Add documentation about kernel stacks to the Instruments doc. r=mstange

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Differential Revision: https://phabricator.services.mozilla.com/D123675
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Jeff Muizelaar 2021-08-25 19:34:54 +00:00
parent 53e46875cf
commit 2e351a5376
1 changed files with 12 additions and 0 deletions
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docs/performance/profiling_with_instruments.md
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@ -47,6 +47,18 @@ build with jemalloc disabled (`ac_add_options --disable-jemalloc`). You
also need the fix to [Bug
719427](https://bugzilla.mozilla.org/show_bug.cgi?id=719427 "https://bugzilla.mozilla.org/show_bug.cgi?id=719427")
## Kernel stacks
Under "File" -> "Recording Options" you can enable "Record Kernel Callstacks".
To get full symbols and not just the exported ones, you'll to install the matching
[Kernel Debug Kit](https://developer.apple.com/download/all/?q=Kernel%20Debug%20Kit).
Instruments uses Spotlight to find the dSYMs with the matching uuid so if the
symbols are still not showing up it may help to move the appropriate dSYM file
to a place where Spotlight will notice it. You can double check the uuid of the
kernel in `/System/Library/Kernels` with `dwarfdump --uuid` and check that
Spotlight knows about the file with `mdls`.
## Misc
The `DTPerformanceSession` api can be used to control profiling from
applications like the old CHUD API we use in Shark builds. [Bug
667036](https://bugzilla.mozilla.org/show_bug.cgi?id=667036 "https://bugzilla.mozilla.org/show_bug.cgi?id=667036")