| commit | dde7989483257cf4dbae083bb29435a2345f1d3f | [log] [tgz] |
|---|---|---|
| author | Gwen Mittertreiner <gmtr@fuchsia.infra.roller.google.com> | Fri Nov 22 00:03:56 2024 +0000 |
| committer | Copybara-Service <copybara-worker@google.com> | Thu Nov 21 16:05:49 2024 -0800 |
| tree | 9aa5c75ee2662e5e811a98ecc7c3fe7a059ce77d | |
| parent | bd9f8882b6f6e68deb337ab539b35fdad47c03d1 [diff] |
[roll] Roll fuchsia [thread_sampler] Disable Ints While Writing Samples Interrupts are enabled while we are taking samples because we need to allow interrupts to usercopy. However, because they aren't disabled, this allows the possibility that we begin writing, set the pending write, then are context switched out. Another thread would then attempt to write a sample on the same cpu, violating the assertion that there isn't a pending write. Since the trace buffer is mapped and pinned, it is safe to write to it while interrupts are off, so we now do so. Testing: Without the interrupts change, ThreadSampler.HighFrequency consistently hits the assertion fail. With the added disabled interrupts it now passes. Original-Fixed: 379166110 Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1159872 Original-Revision: 49cb658aab947d662cebbfee465d83a554d07808 GitOrigin-RevId: 4fa65910cd32aff10802aa7551e42559934f5bc2 Change-Id: If37ba8b848ca4386f8b8e2ea7857d9f4a5440d0e
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