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Attempt to clarify discussion of MPOL_DEFAULT.

This commit is contained in:
Michael Kerrisk 2008-08-11 05:31:24 +00:00
parent 58a69c3c86
commit bdd7bc29e2
1 changed files with 13 additions and 5 deletions
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18
man2/mbind.2
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@ -174,7 +174,8 @@ and contains memory.
The
.B MPOL_DEFAULT
mode specifies that the default policy should be used.
mode requests that any non-default policy be removed,
restoring default behavior.
When applied to a range of memory via
.BR mbind (),
this means to use the process policy,
@ -183,7 +184,7 @@ which may have been set with
If the mode of the process policy is also
.BR MPOL_DEFAULT ,
the system-wide default policy will be used.
The system-wide default policy will allocate
The system-wide default policy allocates
pages on the node of the CPU that triggers the allocation.
For
.BR MPOL_DEFAULT ,
@ -389,20 +390,27 @@ is ignored on huge page mappings.
The
.BR MPOL_DEFAULT ,
mode has different effects for
mode can have different effects for
.BR mbind ()
and
.BR set_mempolicy (2).
When
.B MPOL_DEFAULT
is specified for
.BR set_mempolicy (2),
the process' policy reverts to system default policy
or local allocation.
When
.B MPOL_DEFAULT
is specified for a range of memory using
.BR mbind (),
any pages subsequently allocated for that range will use
the process's policy, as set by
.BR set_mempolicy (2).
This effectively removes the explicit policy from the
specified range.
To select "local allocation" for a memory range,
specified range, "falling back" to a possibly non-default
policy.
To select explicit "local allocation" for a memory range,
specify a
.I mode
of