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Message-Id: <20071031071203.21924.70083.sendpatchset@jackhammer.engr.sgi.com>
Date: Wed, 31 Oct 2007 00:12:03 -0700
From: Paul Jackson <pj@....com>
To: David Rientjes <rientjes@...gle.com>
Cc: Lee.Schermerhorn@...com, linux-kernel@...r.kernel.org,
Paul Jackson <pj@....com>,
Christoph Lameter <clameter@....com>, Andi Kleen <ak@...e.de>
Subject: [RFC] mempolicy minor code cleanups
From: Paul Jackson <pj@....com>
Some minor code cleanups for mm/mempolicy.c.
This patch should have been sent out before,
to be applied first to 2.6.23-mm1, -before-
another patch I sent out an hour ago:
[RFC] cpuset relative memory policies - second choice
Signed-off-by: Paul Jackson <pj@....com>
---
include/linux/mempolicy.h | 5 +++--
mm/mempolicy.c | 20 ++++++++++----------
2 files changed, 13 insertions(+), 12 deletions(-)
--- 2.6.23-mm1.orig/include/linux/mempolicy.h 2007-10-30 03:29:37.000000000 -0700
+++ 2.6.23-mm1/include/linux/mempolicy.h 2007-10-30 04:14:58.000000000 -0700
@@ -23,7 +23,8 @@
/* Flags for mbind */
#define MPOL_MF_STRICT (1<<0) /* Verify existing pages in the mapping */
-#define MPOL_MF_MOVE (1<<1) /* Move pages owned by this process to conform to mapping */
+#define MPOL_MF_MOVE (1<<1) /* Move pages owned by this process to conform
+ to mapping */
#define MPOL_MF_MOVE_ALL (1<<2) /* Move every page to conform to mapping */
#define MPOL_MF_INTERNAL (1<<3) /* Internal flags start here */
@@ -48,7 +49,7 @@ struct mm_struct;
* the process policy is used. Interrupts ignore the memory policy
* of the current process.
*
- * Locking policy for interlave:
+ * Locking policy for interleave:
* In process context there is no locking because only the process accesses
* its own state. All vma manipulation is somewhat protected by a down_read on
* mmap_sem.
--- 2.6.23-mm1.orig/mm/mempolicy.c 2007-10-30 03:29:37.000000000 -0700
+++ 2.6.23-mm1/mm/mempolicy.c 2007-10-30 04:15:05.000000000 -0700
@@ -25,7 +25,7 @@
* to the last. It would be better if bind would truly restrict
* the allocation to memory nodes instead
*
- * preferred Try a specific node first before normal fallback.
+ * preferred Try a specific node first before normal fallback.
* As a special case node -1 here means do the allocation
* on the local CPU. This is normally identical to default,
* but useful to set in a VMA when you have a non default
@@ -541,7 +541,7 @@ static long do_get_mempolicy(int *policy
if (flags & (MPOL_F_NODE|MPOL_F_ADDR))
return -EINVAL;
*policy = 0; /* just so it's initialized */
- *nmask = cpuset_current_mems_allowed;
+ *nmask = cpuset_current_mems_allowed;
return 0;
}
@@ -688,7 +688,7 @@ int do_migrate_pages(struct mm_struct *m
tmp = *from_nodes;
while (!nodes_empty(tmp)) {
- int s,d;
+ int s, d;
int source = -1;
int dest = 0;
@@ -783,6 +783,8 @@ static long do_mbind(unsigned long start
if (mpol_check_policy(mode, nmask))
return -EINVAL;
+ cpuset_update_task_memory_state();
+
new = mpol_new(mode, nmask);
if (IS_ERR(new))
return PTR_ERR(new);
@@ -794,7 +796,7 @@ static long do_mbind(unsigned long start
if (!new)
flags |= MPOL_MF_DISCONTIG_OK;
- pr_debug("mbind %lx-%lx mode:%ld nodes:%lx\n",start,start+len,
+ pr_debug("mbind %lx-%lx mode:%ld nodes:%lx\n", start, start+len,
mode, nmask ? nodes_addr(*nmask)[0] : -1);
down_write(&mm->mmap_sem);
@@ -898,10 +900,8 @@ asmlinkage long sys_mbind(unsigned long
err = get_nodes(&nodes, nmask, maxnode);
if (err)
return err;
-#ifdef CONFIG_CPUSETS
/* Restrict the nodes to the allowed nodes in the cpuset */
- nodes_and(nodes, nodes, current->mems_allowed);
-#endif
+ nodes_and(nodes, nodes, cpuset_current_mems_allowed);
return do_mbind(start, len, mode, &nodes, flags);
}
@@ -1384,7 +1384,7 @@ EXPORT_SYMBOL(alloc_pages_current);
/*
* If mpol_copy() sees current->cpuset == cpuset_being_rebound, then it
- * rebinds the mempolicy its copying by calling mpol_rebind_policy()
+ * rebinds the mempolicy it's copying by calling mpol_rebind_policy()
* with the mems_allowed returned by cpuset_mems_allowed(). This
* keeps mempolicies cpuset relative after its cpuset moves. See
* further kernel/cpuset.c update_nodemask().
@@ -1741,9 +1741,9 @@ static void mpol_rebind_policy(struct me
case MPOL_INTERLEAVE:
nodes_remap(tmp, pol->v.nodes, *mpolmask, *newmask);
pol->v.nodes = tmp;
- *mpolmask = *newmask;
current->il_next = node_remap(current->il_next,
*mpolmask, *newmask);
+ *mpolmask = *newmask;
break;
case MPOL_PREFERRED:
pol->v.preferred_node = node_remap(pol->v.preferred_node,
@@ -1763,7 +1763,7 @@ static void mpol_rebind_policy(struct me
zonelist = bind_zonelist(&nodes);
- /* If no mem, then zonelist is NULL and we keep old zonelist.
+ /* If no mem, then zonelist is -ENOMEM and we keep old zonelist.
* If that old zonelist has no remaining mems_allowed nodes,
* then zonelist_policy() will "FALL THROUGH" to MPOL_DEFAULT.
*/
--
I won't rest till it's the best ...
Programmer, Linux Scalability
Paul Jackson <pj@....com> 1.650.933.1373
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