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mempolicy: add MPOL_F_RELATIVE_NODES flag

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Adds another optional mode flag, MPOL_F_RELATIVE_NODES, that specifies
nodemasks passed via set_mempolicy() or mbind() should be considered relative
to the current task's mems_allowed.

When the mempolicy is created, the passed nodemask is folded and mapped onto
the current task's mems_allowed.  For example, consider a task using
set_mempolicy() to pass MPOL_INTERLEAVE | MPOL_F_RELATIVE_NODES with a
nodemask of 1-3.  If current's mems_allowed is 4-7, the effected nodemask is
5-7 (the second, third, and fourth node of mems_allowed).

If the same task is attached to a cpuset, the mempolicy nodemask is rebound
each time the mems are changed.  Some possible rebinds and results are:

	mems			result
	1-3			1-3
	1-7			2-4
	1,5-6			1,5-6
	1,5-7			5-7

Likewise, the zonelist built for MPOL_BIND acts on the set of zones assigned
to the resultant nodemask from the relative remap.

In the MPOL_PREFERRED case, the preferred node is remapped from the currently
effected nodemask to the relative nodemask.

This mempolicy mode flag was conceived of by Paul Jackson <[email protected]>.

Cc: Paul Jackson <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Lee Schermerhorn <[email protected]>
Cc: Andi Kleen <[email protected]>
Signed-off-by: David Rientjes <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
David Rientjes 2008-04-28 02:12:30 -07:00 • committed by Linus Torvalds
commit 4c50bc0116
3 changed files with 39 additions and 3 deletions
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6
mm/shmem.c
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@ -1128,6 +1128,12 @@ static int shmem_parse_mpol(char *value, unsigned short *policy,
if (flags) {
if (!strcmp(flags, "static"))
*mode_flags |= MPOL_F_STATIC_NODES;
if (!strcmp(flags, "relative"))
*mode_flags |= MPOL_F_RELATIVE_NODES;
if ((*mode_flags & MPOL_F_STATIC_NODES) &&
(*mode_flags & MPOL_F_RELATIVE_NODES))
err = 1;
}
out:
/* Restore string for error message */