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gh-154060: Fix the Profile Stats offsets in the profiling binary format docs and a missing flag #157871

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Merged
pablogsal merged 5 commits into from
Oct 5, 2026
+3 −2
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gh-154060: Fix the Profile Stats offsets in the profiling binary format docs and a missing flag #157871

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78668ca
correct profile stats size and paddings
maurycy Sep 20, 2026
237418d
missing flag
maurycy Sep 20, 2026
88cf119
Merge branch 'main' into tachyon-docs-profiling-format
maurycy Oct 5, 2026
fcae891
Merge remote-tracking branch 'upstream/main' into tachyon-land-157871
pablogsal Oct 5, 2026
8a48a1d
gh-154060: Clarify the main-thread status flag
pablogsal Oct 5, 2026
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5 changes: 3 additions & 2 deletions InternalDocs/profiling_binary_format.md
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Original file line number Diff line number Diff line change
Expand Up @@ -47,8 +47,8 @@ The file consists of five required sections and one optional extension:
| String Table | Variable size
+------------------+ frame_table_offset
| Frame Table | Variable size
+------------------+ file_size - 64 (when stats are present)
| Profile Stats | 32 bytes (optional)
+------------------+ file_size - 88 (when stats are present)
| Profile Stats | 56 bytes (optional)
+------------------+ file_size - 32
| Footer | 32 bytes (fixed)
+------------------+ file_size
Expand Down Expand Up @@ -220,6 +220,7 @@ The status byte is a bitfield encoding thread state at sample time:
| 2 | THREAD_STATUS_UNKNOWN | Thread state could not be determined |
| 3 | THREAD_STATUS_GIL_REQUESTED | Thread is waiting to acquire the GIL |
| 4 | THREAD_STATUS_HAS_EXCEPTION | Thread has a pending exception |
| 5 | THREAD_STATUS_MAIN_THREAD | Thread is the interpreter's main thread |

Multiple flags can be set simultaneously (e.g., a thread can hold the GIL
while also running on CPU). Analysis tools use these to filter samples or
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