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authorPaul Jackson <pj@sgi.com>2006-01-08 01:01:54 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-08 20:13:43 -0800
commitcf2a473c4089aa41c26f653200673f5a4cc25047 (patch)
tree0bce21f4684a382b13e93ba5b85409cf5eab1c2c /kernel/cpuset.c
parentb4b2641843db124637fa3d2cb2101982035dcc82 (diff)
downloadlinux-cf2a473c4089aa41c26f653200673f5a4cc25047.tar.bz2
[PATCH] cpuset: combine refresh_mems and update_mems
The important code paths through alloc_pages_current() and alloc_page_vma(), by which most kernel page allocations go, both called cpuset_update_current_mems_allowed(), which in turn called refresh_mems(). -Both- of these latter two routines did a tasklock, got the tasks cpuset pointer, and checked for out of date cpuset->mems_generation. That was a silly duplication of code and waste of CPU cycles on an important code path. Consolidated those two routines into a single routine, called cpuset_update_task_memory_state(), since it updates more than just mems_allowed. Changed all callers of either routine to call the new consolidated routine. Signed-off-by: Paul Jackson <pj@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/cpuset.c')
-rw-r--r--kernel/cpuset.c95
1 files changed, 41 insertions, 54 deletions
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index d9349cc48b95..e9917d71628a 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -584,13 +584,26 @@ static void guarantee_online_mems(const struct cpuset *cs, nodemask_t *pmask)
BUG_ON(!nodes_intersects(*pmask, node_online_map));
}
-/*
- * Refresh current tasks mems_allowed and mems_generation from current
- * tasks cpuset.
+/**
+ * cpuset_update_task_memory_state - update task memory placement
*
- * Call without callback_sem or task_lock() held. May be called with
- * or without manage_sem held. Will acquire task_lock() and might
- * acquire callback_sem during call.
+ * If the current tasks cpusets mems_allowed changed behind our
+ * backs, update current->mems_allowed, mems_generation and task NUMA
+ * mempolicy to the new value.
+ *
+ * Task mempolicy is updated by rebinding it relative to the
+ * current->cpuset if a task has its memory placement changed.
+ * Do not call this routine if in_interrupt().
+ *
+ * Call without callback_sem or task_lock() held. May be called
+ * with or without manage_sem held. Except in early boot or
+ * an exiting task, when tsk->cpuset is NULL, this routine will
+ * acquire task_lock(). We don't need to use task_lock to guard
+ * against another task changing a non-NULL cpuset pointer to NULL,
+ * as that is only done by a task on itself, and if the current task
+ * is here, it is not simultaneously in the exit code NULL'ing its
+ * cpuset pointer. This routine also might acquire callback_sem and
+ * current->mm->mmap_sem during call.
*
* The task_lock() is required to dereference current->cpuset safely.
* Without it, we could pick up the pointer value of current->cpuset
@@ -605,32 +618,36 @@ static void guarantee_online_mems(const struct cpuset *cs, nodemask_t *pmask)
* task has been modifying its cpuset.
*/
-static void refresh_mems(void)
+void cpuset_update_task_memory_state()
{
int my_cpusets_mem_gen;
+ struct task_struct *tsk = current;
+ struct cpuset *cs = tsk->cpuset;
- task_lock(current);
- my_cpusets_mem_gen = current->cpuset->mems_generation;
- task_unlock(current);
+ if (unlikely(!cs))
+ return;
+
+ task_lock(tsk);
+ my_cpusets_mem_gen = cs->mems_generation;
+ task_unlock(tsk);
- if (current->cpuset_mems_generation != my_cpusets_mem_gen) {
- struct cpuset *cs;
- nodemask_t oldmem = current->mems_allowed;
+ if (my_cpusets_mem_gen != tsk->cpuset_mems_generation) {
+ nodemask_t oldmem = tsk->mems_allowed;
int migrate;
down(&callback_sem);
- task_lock(current);
- cs = current->cpuset;
+ task_lock(tsk);
+ cs = tsk->cpuset; /* Maybe changed when task not locked */
migrate = is_memory_migrate(cs);
- guarantee_online_mems(cs, &current->mems_allowed);
- current->cpuset_mems_generation = cs->mems_generation;
- task_unlock(current);
+ guarantee_online_mems(cs, &tsk->mems_allowed);
+ tsk->cpuset_mems_generation = cs->mems_generation;
+ task_unlock(tsk);
up(&callback_sem);
- if (!nodes_equal(oldmem, current->mems_allowed)) {
- numa_policy_rebind(&oldmem, &current->mems_allowed);
+ numa_policy_rebind(&oldmem, &tsk->mems_allowed);
+ if (!nodes_equal(oldmem, tsk->mems_allowed)) {
if (migrate) {
- do_migrate_pages(current->mm, &oldmem,
- &current->mems_allowed,
+ do_migrate_pages(tsk->mm, &oldmem,
+ &tsk->mems_allowed,
MPOL_MF_MOVE_ALL);
}
}
@@ -1630,7 +1647,7 @@ static long cpuset_create(struct cpuset *parent, const char *name, int mode)
return -ENOMEM;
down(&manage_sem);
- refresh_mems();
+ cpuset_update_task_memory_state();
cs->flags = 0;
if (notify_on_release(parent))
set_bit(CS_NOTIFY_ON_RELEASE, &cs->flags);
@@ -1688,7 +1705,7 @@ static int cpuset_rmdir(struct inode *unused_dir, struct dentry *dentry)
/* the vfs holds both inode->i_sem already */
down(&manage_sem);
- refresh_mems();
+ cpuset_update_task_memory_state();
if (atomic_read(&cs->count) > 0) {
up(&manage_sem);
return -EBUSY;
@@ -1873,36 +1890,6 @@ void cpuset_init_current_mems_allowed(void)
}
/**
- * cpuset_update_current_mems_allowed - update mems parameters to new values
- *
- * If the current tasks cpusets mems_allowed changed behind our backs,
- * update current->mems_allowed and mems_generation to the new value.
- * Do not call this routine if in_interrupt().
- *
- * Call without callback_sem or task_lock() held. May be called
- * with or without manage_sem held. Unless exiting, it will acquire
- * task_lock(). Also might acquire callback_sem during call to
- * refresh_mems().
- */
-
-void cpuset_update_current_mems_allowed(void)
-{
- struct cpuset *cs;
- int need_to_refresh = 0;
-
- task_lock(current);
- cs = current->cpuset;
- if (!cs)
- goto done;
- if (current->cpuset_mems_generation != cs->mems_generation)
- need_to_refresh = 1;
-done:
- task_unlock(current);
- if (need_to_refresh)
- refresh_mems();
-}
-
-/**
* cpuset_zonelist_valid_mems_allowed - check zonelist vs. curremt mems_allowed
* @zl: the zonelist to be checked
*