Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=8a63011275e1a0ec9389e8c7d9b08caab8957ca0
Commit: 8a63011275e1a0ec9389e8c7d9b08caab8957ca0
Parent: 85badbdf5120d246ce2bb3f1a7689a805f9c9006
Author: Ken Chen <[EMAIL PROTECTED]>
AuthorDate: Wed May 9 02:33:34 2007 -0700
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Wed May 9 12:30:49 2007 -0700
pretend cpuset has some form of hugetlb page reservation
When cpuset is configured, it breaks the strict hugetlb page reservation as
the accounting is done on a global variable. Such reservation is
completely rubbish in the presence of cpuset because the reservation is not
checked against page availability for the current cpuset. Application can
still potentially OOM'ed by kernel with lack of free htlb page in cpuset
that the task is in. Attempt to enforce strict accounting with cpuset is
almost impossible (or too ugly) because cpuset is too fluid that task or
memory node can be dynamically moved between cpusets.
The change of semantics for shared hugetlb mapping with cpuset is
undesirable. However, in order to preserve some of the semantics, we fall
back to check against current free page availability as a best attempt and
hopefully to minimize the impact of changing semantics that cpuset has on
hugetlb.
Signed-off-by: Ken Chen <[EMAIL PROTECTED]>
Cc: Paul Jackson <[EMAIL PROTECTED]>
Cc: Christoph Lameter <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
mm/hugetlb.c | 31 +++++++++++++++++++++++++++++++
1 files changed, 31 insertions(+), 0 deletions(-)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 88e708b..eb7180d 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -174,6 +174,17 @@ static int __init hugetlb_setup(char *s)
}
__setup("hugepages=", hugetlb_setup);
+static unsigned int cpuset_mems_nr(unsigned int *array)
+{
+ int node;
+ unsigned int nr = 0;
+
+ for_each_node_mask(node, cpuset_current_mems_allowed)
+ nr += array[node];
+
+ return nr;
+}
+
#ifdef CONFIG_SYSCTL
static void update_and_free_page(struct page *page)
{
@@ -819,6 +830,26 @@ int hugetlb_reserve_pages(struct inode *inode, long from,
long to)
chg = region_chg(&inode->i_mapping->private_list, from, to);
if (chg < 0)
return chg;
+ /*
+ * When cpuset is configured, it breaks the strict hugetlb page
+ * reservation as the accounting is done on a global variable. Such
+ * reservation is completely rubbish in the presence of cpuset because
+ * the reservation is not checked against page availability for the
+ * current cpuset. Application can still potentially OOM'ed by kernel
+ * with lack of free htlb page in cpuset that the task is in.
+ * Attempt to enforce strict accounting with cpuset is almost
+ * impossible (or too ugly) because cpuset is too fluid that
+ * task or memory node can be dynamically moved between cpusets.
+ *
+ * The change of semantics for shared hugetlb mapping with cpuset is
+ * undesirable. However, in order to preserve some of the semantics,
+ * we fall back to check against current free page availability as
+ * a best attempt and hopefully to minimize the impact of changing
+ * semantics that cpuset has.
+ */
+ if (chg > cpuset_mems_nr(free_huge_pages_node))
+ return -ENOMEM;
+
ret = hugetlb_acct_memory(chg);
if (ret < 0)
return ret;
-
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