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PCI: Mem Policy: fix mempolicy usage in pci driver

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In an attempt to ensure memory allocation from the local node, the pci
driver temporarily replaces the current task's memory policy with the
system default policy.  Trying to be a good citizen, the driver then call's
mpol_get() on the new policy.  When it's finished probing, it undoes the
'_get by calling mpol_free() [on the system default policy] and then
restores the current task's saved mempolicy.

A couple of issues here:

1) it's never necessary to set a task's mempolicy to the
   system default policy in order to get system default
   allocation behavior.  Simply set the current task's
   mempolicy to NULL and allocations will fall back to
   system default policy.

2) we should never [need to] call mpol_free() on the system
   default policy.  [I plan on trapping this with a VM_BUG_ON()
   in a subsequent patch.]

This patch removes the calls to mpol_get() and mpol_free()
and uses NULL for the temporary task mempolicy to effect
default allocation behavior.

Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Acked-by: Christoph Lameter <clameter@sgi.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Lee Schermerhorn 2007-11-21 15:07:05 -08:00 committed by Greg Kroah-Hartman
parent 53a9bf4267
commit 74e27e44b0
1 changed files with 1 additions and 3 deletions
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4
drivers/pci/pci-driver.c
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@ -186,13 +186,11 @@ static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
set_cpus_allowed(current, node_to_cpumask(node));
/* And set default memory allocation policy */
oldpol = current->mempolicy;
current->mempolicy = &default_policy;
mpol_get(current->mempolicy);
current->mempolicy = NULL; /* fall back to system default policy */
#endif
error = drv->probe(dev, id);
#ifdef CONFIG_NUMA
set_cpus_allowed(current, oldmask);
mpol_free(current->mempolicy);
current->mempolicy = oldpol;
#endif
return error;