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Subject[PATCH 06/10] Cpuset: implement cpuset_mems_allowed
Provide a cpuset_mems_allowed() method, which the sys_migrate_pages()
code needed, to obtain the mems_allowed vector of a cpuset, and
replaced the workaround in sys_migrate_pages() to call this new
method.

Signed-off-by: Paul Jackson <pj@sgi.com>

---

include/linux/cpuset.h | 8 +++++++-
kernel/cpuset.c | 29 ++++++++++++++++++++++++++---
mm/mempolicy.c | 3 ---
3 files changed, 33 insertions(+), 7 deletions(-)

--- 2.6.15-rc3-mm1.orig/include/linux/cpuset.h 2005-12-07 23:34:04.173695910 -0800
+++ 2.6.15-rc3-mm1/include/linux/cpuset.h 2005-12-07 23:36:26.159621364 -0800
@@ -18,7 +18,8 @@ extern int cpuset_init(void);
extern void cpuset_init_smp(void);
extern void cpuset_fork(struct task_struct *p);
extern void cpuset_exit(struct task_struct *p);
-extern cpumask_t cpuset_cpus_allowed(const struct task_struct *p);
+extern cpumask_t cpuset_cpus_allowed(struct task_struct *p);
+extern nodemask_t cpuset_mems_allowed(struct task_struct *p);
void cpuset_init_current_mems_allowed(void);
void cpuset_update_task_memory_state(void);
#define cpuset_nodes_subset_current_mems_allowed(nodes) \
@@ -50,6 +51,11 @@ static inline cpumask_t cpuset_cpus_allo
return cpu_possible_map;
}

+static inline nodemask_t cpuset_mems_allowed(struct task_struct *p)
+{
+ return node_possible_map;
+}
+
static inline void cpuset_init_current_mems_allowed(void) {}
static inline void cpuset_update_task_memory_state(void) {}
#define cpuset_nodes_subset_current_mems_allowed(nodes) (1)
--- 2.6.15-rc3-mm1.orig/kernel/cpuset.c 2005-12-07 23:35:54.229585036 -0800
+++ 2.6.15-rc3-mm1/kernel/cpuset.c 2005-12-07 23:36:26.164504230 -0800
@@ -1871,14 +1871,14 @@ void cpuset_exit(struct task_struct *tsk
* tasks cpuset.
**/

-cpumask_t cpuset_cpus_allowed(const struct task_struct *tsk)
+cpumask_t cpuset_cpus_allowed(struct task_struct *tsk)
{
cpumask_t mask;

down(&callback_sem);
- task_lock((struct task_struct *)tsk);
+ task_lock(tsk);
guarantee_online_cpus(tsk->cpuset, &mask);
- task_unlock((struct task_struct *)tsk);
+ task_unlock(tsk);
up(&callback_sem);

return mask;
@@ -1890,6 +1890,29 @@ void cpuset_init_current_mems_allowed(vo
}

/**
+ * cpuset_mems_allowed - return mems_allowed mask from a tasks cpuset.
+ * @tsk: pointer to task_struct from which to obtain cpuset->mems_allowed.
+ *
+ * Description: Returns the nodemask_t mems_allowed of the cpuset
+ * attached to the specified @tsk. Guaranteed to return some non-empty
+ * subset of node_online_map, even if this means going outside the
+ * tasks cpuset.
+ **/
+
+nodemask_t cpuset_mems_allowed(struct task_struct *tsk)
+{
+ nodemask_t mask;
+
+ down(&callback_sem);
+ task_lock(tsk);
+ guarantee_online_mems(tsk->cpuset, &mask);
+ task_unlock(tsk);
+ up(&callback_sem);
+
+ return mask;
+}
+
+/**
* cpuset_zonelist_valid_mems_allowed - check zonelist vs. curremt mems_allowed
* @zl: the zonelist to be checked
*
--- 2.6.15-rc3-mm1.orig/mm/mempolicy.c 2005-12-07 23:34:04.182485069 -0800
+++ 2.6.15-rc3-mm1/mm/mempolicy.c 2005-12-07 23:36:26.168410523 -0800
@@ -774,9 +774,6 @@ asmlinkage long sys_set_mempolicy(int mo
return do_set_mempolicy(mode, &nodes);
}

-/* Macro needed until Paul implements this function in kernel/cpusets.c */
-#define cpuset_mems_allowed(task) node_online_map
-
asmlinkage long sys_migrate_pages(pid_t pid, unsigned long maxnode,
const unsigned long __user *old_nodes,
const unsigned long __user *new_nodes)
--
I won't rest till it's the best ...
Programmer, Linux Scalability
Paul Jackson <pj@sgi.com> 1.650.933.1373
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