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mremap.2: Some more improvements to Brian Geffon's patch 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2020-04-16 07:49:04 +02:00
parent 452bdc2f02
commit 0f0993c9b5
1 changed files with 21 additions and 9 deletions
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30
man2/mremap.2
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@ -140,16 +140,26 @@ remaps a mapping to a new address but does not unmap the mapping at
.IP
The
.B MREMAP_DONTUNMAP
flag can be used only with private anonymous mappings.
flag can be used only with private anonymous mappings
(see the description of
.BR MAP_PRIVATE
and
.BR MAP_ANONYMOUS
in
.BR mmap (2)).
.IP
Any access to the range specified at
After completion,
any access to the range specified by
.IR old_address
after completion will result in an anonymous page fault.
The anonymous page fault will be handled by a
and
.I old_size
will result in a page fault.
The page fault will be handled by a
.BR userfaultfd (2)
if the range was previously registered on the mapping specified by
.IR old_address .
Otherwise, it will be zero filled by the kernel.
handler
if the address is in a range previously registered with
.BR userfaultfd (2).
Otherwise, the kernel allocates a zero-filled page to handle the fault.
.PP
If the memory segment specified by
.I old_address
@ -226,9 +236,11 @@ was specified without also specifying
.BR MREMAP_MAYMOVE ;
.IP *
.B MREMAP_DONTUNMAP
was specified with an
was specified, but one or more pages in the range specified by
.IR old_address
that was not private anonymous;
and
.IR old_size
were not private anonymous;
.IP *
.B MREMAP_DONTUNMAP
was specified and