Bug 212153 - mmap: clarify that MAP_POPULATE is best-effort
Summary: mmap: clarify that MAP_POPULATE is best-effort
Status: NEW
Alias: None
Product: Documentation
Classification: Unclassified
Component: man-pages (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: documentation_man-pages@kernel-bugs.osdl.org
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2021-03-09 11:08 UTC by Bruce Merry
Modified: 2021-03-23 07:30 UTC (History)
1 user (show)

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Regression: No
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Description Bruce Merry 2021-03-09 11:08:13 UTC 
The description of MAP_LOCKED in mmap(2) is clear that it is best-effort and will not fail the call if it is unable to do the locking. It appears that MAP_POPULATE is similar (email at https://marc.info/?l=linux-mm&m=161528594100612&w=2), but this is not documented.
Comment 1 Alejandro Colomar 2021-03-19 22:55:30 UTC 
Hi Bruce,

Would you mind sending a draft of the text (possibly a patch to <linux-man@vger.kernel.org>) that you think would fit MAP_POPULATE?

Thanks,

Alex
Comment 2 Bruce Merry 2021-03-23 07:30:25 UTC 
I can give it a go, although it should definitely be reviewed by someone who is familiar with the internals.
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