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Note out-of-date obmalloc comments (#148149)

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Vladimir's original overviews, from 1998, are still good, but going
on 30 years later details have changed. Note that, but rather try
to keep up with moving targets in a different file, point to
sys._debugmallocstats() as the sure way to discover precise current
details.

No code changes, just added a block comment.

Co-authored-by: Bartosz Sławecki <bartosz@ilikepython.com>
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Tim Peters 2026-04-06 23:08:47 -05:00 • committed by GitHub
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6
Include/internal/pycore_obmalloc.h
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@ -14,6 +14,12 @@ typedef unsigned int pymem_uint; /* assuming >= 16 bits */
#undef uint
#define uint pymem_uint
/* NOTE: the following overviews were in the initial checkin, in 1998. In
* 2026, they're still helpful, but some details have changed. For example,
* we now use 32 size classes 16 bytes apart, and an arena is generally at
* least 1MB. Use sys._debugmallocstats() to see exact current details for
* the specific version of CPython used.
*/
/* An object allocator for Python.