* [PATCH v2 1/3][-mm] memcg: use for_each_mem_cgroup
2010-09-21 9:31 [PATCH v2 0/3][-mm] memcg: memory cgroup cput hotplug support update KAMEZAWA Hiroyuki
@ 2010-09-21 9:34 ` KAMEZAWA Hiroyuki
2010-09-21 9:35 ` [PATCH v2 2/3][-mm] memcg: cpu hotplug aware percpu count updates KAMEZAWA Hiroyuki
2010-09-21 9:36 ` [PATCH v2 3/3][-mm] memcg: cpu hotplug aware quick acount_move detection KAMEZAWA Hiroyuki
2 siblings, 0 replies; 4+ messages in thread
From: KAMEZAWA Hiroyuki @ 2010-09-21 9:34 UTC (permalink / raw)
To: KAMEZAWA Hiroyuki; +Cc: linux-mm, balbir, nishimura, akpm, linux-kernel
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
In memory cgroup management, we sometimes have to walk through
subhierarchy of cgroup to gather informaiton, or lock something, etc.
Now, to do that, mem_cgroup_walk_tree() function is provided. It calls given
callback function per cgroup found. But the bad thing is that it has to pass
a fixed style function and argument, "void*" and it adds much type casting to
memcontrol.c.
To make the code clean, this patch replaces walk_tree() with
for_each_mem_cgroup_tree(iter, root)
An iterator style call. The good point is that iterator call doesn't
have to assume what kind of function is called under it. A bad point
is that it may cause reference-count leak if a caller use "break" from the
loop by mistake.
I think the benefit is larger. The modified code seems straigtforward
and easy to read because we don't have misterious callbacks and pointer
cast.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
---
mm/memcontrol.c | 172 +++++++++++++++++++++++++++-----------------------------
1 file changed, 84 insertions(+), 88 deletions(-)
Index: mmotm-0915/mm/memcontrol.c
===================================================================
--- mmotm-0915.orig/mm/memcontrol.c
+++ mmotm-0915/mm/memcontrol.c
@@ -660,40 +660,57 @@ static struct mem_cgroup *try_get_mem_cg
return mem;
}
-/*
- * Call callback function against all cgroup under hierarchy tree.
- */
-static int mem_cgroup_walk_tree(struct mem_cgroup *root, void *data,
- int (*func)(struct mem_cgroup *, void *))
+/* The caller has to guarantee "mem" exists before calling this */
+static struct mem_cgroup *mem_cgroup_start_loop(struct mem_cgroup *mem)
{
- int found, ret, nextid;
+ if (mem && css_tryget(&mem->css))
+ return mem;
+ return NULL;
+}
+
+static struct mem_cgroup *mem_cgroup_get_next(struct mem_cgroup *iter,
+ struct mem_cgroup *root,
+ bool cond)
+{
+ int nextid = css_id(&iter->css) + 1;
+ int found;
+ int hierarchy_used;
struct cgroup_subsys_state *css;
- struct mem_cgroup *mem;
- if (!root->use_hierarchy)
- return (*func)(root, data);
+ hierarchy_used = iter->use_hierarchy;
- nextid = 1;
- do {
- ret = 0;
- mem = NULL;
+ css_put(&iter->css);
+ if (!cond || !hierarchy_used)
+ return NULL;
+ do {
+ iter = NULL;
rcu_read_lock();
- css = css_get_next(&mem_cgroup_subsys, nextid, &root->css,
- &found);
+
+ css = css_get_next(&mem_cgroup_subsys, nextid,
+ &root->css, &found);
if (css && css_tryget(css))
- mem = container_of(css, struct mem_cgroup, css);
+ iter = container_of(css, struct mem_cgroup, css);
rcu_read_unlock();
-
- if (mem) {
- ret = (*func)(mem, data);
- css_put(&mem->css);
- }
+ /* If css is NULL, no more cgroups will be found */
nextid = found + 1;
- } while (!ret && css);
+ } while (css && !iter);
- return ret;
+ return iter;
}
+/*
+ * for_eacn_mem_cgroup_tree() for visiting all cgroup under tree. Please
+ * be careful that "break" loop is not allowed. We have reference count.
+ * Instead of that modify "cond" to be false and "continue" to exit the loop.
+ */
+#define for_each_mem_cgroup_tree_cond(iter, root, cond) \
+ for (iter = mem_cgroup_start_loop(root);\
+ iter != NULL;\
+ iter = mem_cgroup_get_next(iter, root, cond))
+
+#define for_each_mem_cgroup_tree(iter, root) \
+ for_each_mem_cgroup_tree_cond(iter, root, true)
+
static inline bool mem_cgroup_is_root(struct mem_cgroup *mem)
{
@@ -1132,13 +1149,6 @@ static bool mem_cgroup_wait_acct_move(st
return false;
}
-static int mem_cgroup_count_children_cb(struct mem_cgroup *mem, void *data)
-{
- int *val = data;
- (*val)++;
- return 0;
-}
-
/**
* mem_cgroup_print_oom_info: Called from OOM with tasklist_lock held in read mode.
* @memcg: The memory cgroup that went over limit
@@ -1213,7 +1223,10 @@ done:
static int mem_cgroup_count_children(struct mem_cgroup *mem)
{
int num = 0;
- mem_cgroup_walk_tree(mem, &num, mem_cgroup_count_children_cb);
+ struct mem_cgroup *iter;
+
+ for_each_mem_cgroup_tree(iter, mem)
+ num++;
return num;
}
@@ -1362,49 +1375,39 @@ static int mem_cgroup_hierarchical_recla
return total;
}
-static int mem_cgroup_oom_lock_cb(struct mem_cgroup *mem, void *data)
-{
- int *val = (int *)data;
- int x;
- /*
- * Logically, we can stop scanning immediately when we find
- * a memcg is already locked. But condidering unlock ops and
- * creation/removal of memcg, scan-all is simple operation.
- */
- x = atomic_inc_return(&mem->oom_lock);
- *val = max(x, *val);
- return 0;
-}
/*
* Check OOM-Killer is already running under our hierarchy.
* If someone is running, return false.
*/
static bool mem_cgroup_oom_lock(struct mem_cgroup *mem)
{
- int lock_count = 0;
+ int x, lock_count = 0;
+ struct mem_cgroup *iter;
- mem_cgroup_walk_tree(mem, &lock_count, mem_cgroup_oom_lock_cb);
+ for_each_mem_cgroup_tree(iter, mem) {
+ x = atomic_inc_return(&iter->oom_lock);
+ lock_count = max(x, lock_count);
+ }
if (lock_count == 1)
return true;
return false;
}
-static int mem_cgroup_oom_unlock_cb(struct mem_cgroup *mem, void *data)
+static int mem_cgroup_oom_unlock(struct mem_cgroup *mem)
{
+ struct mem_cgroup *iter;
+
/*
* When a new child is created while the hierarchy is under oom,
* mem_cgroup_oom_lock() may not be called. We have to use
* atomic_add_unless() here.
*/
- atomic_add_unless(&mem->oom_lock, -1, 0);
+ for_each_mem_cgroup_tree(iter, mem)
+ atomic_add_unless(&iter->oom_lock, -1, 0);
return 0;
}
-static void mem_cgroup_oom_unlock(struct mem_cgroup *mem)
-{
- mem_cgroup_walk_tree(mem, NULL, mem_cgroup_oom_unlock_cb);
-}
static DEFINE_MUTEX(memcg_oom_mutex);
static DECLARE_WAIT_QUEUE_HEAD(memcg_oom_waitq);
@@ -3207,33 +3210,25 @@ static int mem_cgroup_hierarchy_write(st
return retval;
}
-struct mem_cgroup_idx_data {
- s64 val;
- enum mem_cgroup_stat_index idx;
-};
-static int
-mem_cgroup_get_idx_stat(struct mem_cgroup *mem, void *data)
+static u64 mem_cgroup_get_recursive_idx_stat(struct mem_cgroup *mem,
+ enum mem_cgroup_stat_index idx)
{
- struct mem_cgroup_idx_data *d = data;
- d->val += mem_cgroup_read_stat(mem, d->idx);
- return 0;
-}
+ struct mem_cgroup *iter;
+ s64 val = 0;
-static void
-mem_cgroup_get_recursive_idx_stat(struct mem_cgroup *mem,
- enum mem_cgroup_stat_index idx, s64 *val)
-{
- struct mem_cgroup_idx_data d;
- d.idx = idx;
- d.val = 0;
- mem_cgroup_walk_tree(mem, &d, mem_cgroup_get_idx_stat);
- *val = d.val;
+ /* each per cpu's value can be minus.Then, use s64 */
+ for_each_mem_cgroup_tree(iter, mem)
+ val += mem_cgroup_read_stat(iter, idx);
+
+ if (val < 0) /* race ? */
+ val = 0;
+ return val;
}
static inline u64 mem_cgroup_usage(struct mem_cgroup *mem, bool swap)
{
- u64 idx_val, val;
+ u64 val;
if (!mem_cgroup_is_root(mem)) {
if (!swap)
@@ -3242,16 +3237,12 @@ static inline u64 mem_cgroup_usage(struc
return res_counter_read_u64(&mem->memsw, RES_USAGE);
}
- mem_cgroup_get_recursive_idx_stat(mem, MEM_CGROUP_STAT_CACHE, &idx_val);
- val = idx_val;
- mem_cgroup_get_recursive_idx_stat(mem, MEM_CGROUP_STAT_RSS, &idx_val);
- val += idx_val;
-
- if (swap) {
- mem_cgroup_get_recursive_idx_stat(mem,
- MEM_CGROUP_STAT_SWAPOUT, &idx_val);
- val += idx_val;
- }
+ val = mem_cgroup_get_recursive_idx_stat(mem, MEM_CGROUP_STAT_CACHE);
+ val += mem_cgroup_get_recursive_idx_stat(mem, MEM_CGROUP_STAT_RSS);
+
+ if (swap)
+ val += mem_cgroup_get_recursive_idx_stat(mem,
+ MEM_CGROUP_STAT_SWAPOUT);
return val << PAGE_SHIFT;
}
@@ -3459,9 +3450,9 @@ struct {
};
-static int mem_cgroup_get_local_stat(struct mem_cgroup *mem, void *data)
+static void
+mem_cgroup_get_local_stat(struct mem_cgroup *mem, struct mcs_total_stat *s)
{
- struct mcs_total_stat *s = data;
s64 val;
/* per cpu stat */
@@ -3491,13 +3482,15 @@ static int mem_cgroup_get_local_stat(str
s->stat[MCS_ACTIVE_FILE] += val * PAGE_SIZE;
val = mem_cgroup_get_local_zonestat(mem, LRU_UNEVICTABLE);
s->stat[MCS_UNEVICTABLE] += val * PAGE_SIZE;
- return 0;
}
static void
mem_cgroup_get_total_stat(struct mem_cgroup *mem, struct mcs_total_stat *s)
{
- mem_cgroup_walk_tree(mem, s, mem_cgroup_get_local_stat);
+ struct mem_cgroup *iter;
+
+ for_each_mem_cgroup_tree(iter, mem)
+ mem_cgroup_get_local_stat(iter, s);
}
static int mem_control_stat_show(struct cgroup *cont, struct cftype *cft,
@@ -3670,7 +3663,7 @@ static int compare_thresholds(const void
return _a->threshold - _b->threshold;
}
-static int mem_cgroup_oom_notify_cb(struct mem_cgroup *mem, void *data)
+static int mem_cgroup_oom_notify_cb(struct mem_cgroup *mem)
{
struct mem_cgroup_eventfd_list *ev;
@@ -3681,7 +3674,10 @@ static int mem_cgroup_oom_notify_cb(stru
static void mem_cgroup_oom_notify(struct mem_cgroup *mem)
{
- mem_cgroup_walk_tree(mem, NULL, mem_cgroup_oom_notify_cb);
+ struct mem_cgroup *iter;
+
+ for_each_mem_cgroup_tree(iter, mem)
+ mem_cgroup_oom_notify_cb(iter);
}
static int mem_cgroup_usage_register_event(struct cgroup *cgrp,
--
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^ permalink raw reply [flat|nested] 4+ messages in thread* [PATCH v2 2/3][-mm] memcg: cpu hotplug aware percpu count updates
2010-09-21 9:31 [PATCH v2 0/3][-mm] memcg: memory cgroup cput hotplug support update KAMEZAWA Hiroyuki
2010-09-21 9:34 ` [PATCH v2 1/3][-mm] memcg: use for_each_mem_cgroup KAMEZAWA Hiroyuki
@ 2010-09-21 9:35 ` KAMEZAWA Hiroyuki
2010-09-21 9:36 ` [PATCH v2 3/3][-mm] memcg: cpu hotplug aware quick acount_move detection KAMEZAWA Hiroyuki
2 siblings, 0 replies; 4+ messages in thread
From: KAMEZAWA Hiroyuki @ 2010-09-21 9:35 UTC (permalink / raw)
To: KAMEZAWA Hiroyuki; +Cc: linux-mm, balbir, nishimura, akpm, linux-kernel
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Now, memcgroup's per cpu coutner uses for_each_possible_cpu() to
get the value. It's better to use for_each_online_cpu() and
a cpu hotplug handler.
This patch only handles statistics counter. MEM_CGROUP_ON_MOVE
will be handled in another patch.
Changelog: 2010/09/21
- add and use for_each_mem_cgroup_all()
- added "core" value and spin_lock.
- added Implementation Note for future updates.
- divided out "MEM_CGROUP_ON_MOVE" handling.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
---
mm/memcontrol.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++-----
1 file changed, 74 insertions(+), 6 deletions(-)
Index: mmotm-0915/mm/memcontrol.c
===================================================================
--- mmotm-0915.orig/mm/memcontrol.c
+++ mmotm-0915/mm/memcontrol.c
@@ -89,7 +89,9 @@ enum mem_cgroup_stat_index {
MEM_CGROUP_STAT_PGPGIN_COUNT, /* # of pages paged in */
MEM_CGROUP_STAT_PGPGOUT_COUNT, /* # of pages paged out */
MEM_CGROUP_STAT_SWAPOUT, /* # of pages, swapped out */
- MEM_CGROUP_EVENTS, /* incremented at every pagein/pageout */
+ MEM_CGROUP_STAT_DATA, /* end of data requires synchronization */
+ /* incremented at every pagein/pageout */
+ MEM_CGROUP_EVENTS = MEM_CGROUP_STAT_DATA,
MEM_CGROUP_ON_MOVE, /* someone is moving account between groups */
MEM_CGROUP_STAT_NSTATS,
@@ -255,6 +257,12 @@ struct mem_cgroup {
* percpu counter.
*/
struct mem_cgroup_stat_cpu *stat;
+ /*
+ * used when a cpu is offlined or other synchronizations
+ * See mem_cgroup_read_stat().
+ */
+ struct mem_cgroup_stat_cpu nocpu_base;
+ spinlock_t pcp_counter_lock;
};
/* Stuffs for move charges at task migration. */
@@ -531,14 +539,40 @@ mem_cgroup_largest_soft_limit_node(struc
return mz;
}
+/*
+ * Implementation Note: reading percpu statistics for memcg.
+ *
+ * Both of vmstat[] and percpu_counter has threshold and do periodic
+ * synchronization to implement "quick" read. There are trade-off between
+ * reading cost and precision of value. Then, we may have a chance to implement
+ * a periodic synchronizion of counter in memcg's counter.
+ *
+ * But this _read() function is used for user interface now. The user accounts
+ * memory usage by memory cgroup and he _always_ requires exact value because
+ * he accounts memory. Even if we provide quick-and-fuzzy read, we always
+ * have to visit all online cpus and make sum. So, for now, unnecessary
+ * synchronization is not implemented. (just implemented for cpu hotplug)
+ *
+ * If there are kernel internal actions which can make use of some not-exact
+ * value, and reading all cpu value can be performance bottleneck in some
+ * common workload, threashold and synchonization as vmstat[] should be
+ * implemented.
+ */
static s64 mem_cgroup_read_stat(struct mem_cgroup *mem,
enum mem_cgroup_stat_index idx)
{
int cpu;
s64 val = 0;
- for_each_possible_cpu(cpu)
+ get_online_cpus();
+ for_each_online_cpu(cpu)
val += per_cpu(mem->stat->count[idx], cpu);
+#ifdef CONFIG_HOTPLUG_CPU
+ spin_lock(&mem->pcp_counter_lock);
+ val += mem->nocpu_base.count[idx];
+ spin_unlock(&mem->pcp_counter_lock);
+#endif
+ put_online_cpus();
return val;
}
@@ -665,6 +699,9 @@ static struct mem_cgroup *mem_cgroup_sta
{
if (mem && css_tryget(&mem->css))
return mem;
+ if (!mem)
+ return root_mem_cgroup; /*css_put/get against root is ignored*/
+
return NULL;
}
@@ -680,9 +717,13 @@ static struct mem_cgroup *mem_cgroup_get
hierarchy_used = iter->use_hierarchy;
css_put(&iter->css);
- if (!cond || !hierarchy_used)
+ /* If no ROOT, walk all, ignore hierarchy */
+ if (!cond || (root && !hierarchy_used))
return NULL;
+ if (!root)
+ root = root_mem_cgroup;
+
do {
iter = NULL;
rcu_read_lock();
@@ -711,6 +752,9 @@ static struct mem_cgroup *mem_cgroup_get
#define for_each_mem_cgroup_tree(iter, root) \
for_each_mem_cgroup_tree_cond(iter, root, true)
+#define for_each_mem_cgroup_all(iter) \
+ for_each_mem_cgroup_tree_cond(iter, NULL, true)
+
static inline bool mem_cgroup_is_root(struct mem_cgroup *mem)
{
@@ -1676,15 +1720,38 @@ static void drain_all_stock_sync(void)
atomic_dec(&memcg_drain_count);
}
-static int __cpuinit memcg_stock_cpu_callback(struct notifier_block *nb,
+/*
+ * This function drains percpu counter value from DEAD cpu and
+ * move it to local cpu. Note that this function can be preempted.
+ */
+static void mem_cgroup_drain_pcp_counter(struct mem_cgroup *mem, int cpu)
+{
+ int i;
+
+ spin_lock(&mem->pcp_counter_lock);
+ for (i = 0; i < MEM_CGROUP_STAT_DATA; i++) {
+ s64 x = per_cpu(mem->stat->count[i], cpu);
+
+ per_cpu(mem->stat->count[i], cpu) = 0;
+ mem->nocpu_base.count[i] += x;
+ }
+ spin_unlock(&mem->pcp_counter_lock);
+}
+
+static int __cpuinit memcg_cpu_hotplug_callback(struct notifier_block *nb,
unsigned long action,
void *hcpu)
{
int cpu = (unsigned long)hcpu;
struct memcg_stock_pcp *stock;
+ struct mem_cgroup *iter;
- if (action != CPU_DEAD)
+ if ((action != CPU_DEAD) || action != CPU_DEAD_FROZEN)
return NOTIFY_OK;
+
+ for_each_mem_cgroup_all(iter)
+ mem_cgroup_drain_pcp_counter(iter, cpu);
+
stock = &per_cpu(memcg_stock, cpu);
drain_stock(stock);
return NOTIFY_OK;
@@ -4094,6 +4161,7 @@ static struct mem_cgroup *mem_cgroup_all
vfree(mem);
mem = NULL;
}
+ spin_lock_init(&mem->pcp_counter_lock);
return mem;
}
@@ -4220,7 +4288,7 @@ mem_cgroup_create(struct cgroup_subsys *
&per_cpu(memcg_stock, cpu);
INIT_WORK(&stock->work, drain_local_stock);
}
- hotcpu_notifier(memcg_stock_cpu_callback, 0);
+ hotcpu_notifier(memcg_cpu_hotplug_callback, 0);
} else {
parent = mem_cgroup_from_cont(cont->parent);
mem->use_hierarchy = parent->use_hierarchy;
--
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^ permalink raw reply [flat|nested] 4+ messages in thread* [PATCH v2 3/3][-mm] memcg: cpu hotplug aware quick acount_move detection
2010-09-21 9:31 [PATCH v2 0/3][-mm] memcg: memory cgroup cput hotplug support update KAMEZAWA Hiroyuki
2010-09-21 9:34 ` [PATCH v2 1/3][-mm] memcg: use for_each_mem_cgroup KAMEZAWA Hiroyuki
2010-09-21 9:35 ` [PATCH v2 2/3][-mm] memcg: cpu hotplug aware percpu count updates KAMEZAWA Hiroyuki
@ 2010-09-21 9:36 ` KAMEZAWA Hiroyuki
2 siblings, 0 replies; 4+ messages in thread
From: KAMEZAWA Hiroyuki @ 2010-09-21 9:36 UTC (permalink / raw)
To: KAMEZAWA Hiroyuki; +Cc: linux-mm, balbir, nishimura, akpm, linux-kernel
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
An event counter MEM_CGROUP_ON_MOVE is used for quick check whether
file stat update can be done in async manner or not. Now, it use
percpu counter and for_each_possible_cpu to update.
This patch replaces for_each_possible_cpu to for_each_online_cpu
and adds necessary synchronization logic at CPU HOTPLUG.
Changelog:
- make use of cpu independent "core" value to synchronize.
- replaces mc.lock with pcp_coutner_lock.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
---
mm/memcontrol.c | 37 ++++++++++++++++++++++++++++++-------
1 file changed, 30 insertions(+), 7 deletions(-)
Index: mmotm-0915/mm/memcontrol.c
===================================================================
--- mmotm-0915.orig/mm/memcontrol.c
+++ mmotm-0915/mm/memcontrol.c
@@ -1116,11 +1116,14 @@ static unsigned int get_swappiness(struc
static void mem_cgroup_start_move(struct mem_cgroup *mem)
{
int cpu;
- /* Because this is for moving account, reuse mc.lock */
- spin_lock(&mc.lock);
- for_each_possible_cpu(cpu)
+
+ get_online_cpus();
+ spin_lock(&mem->pcp_counter_lock);
+ for_each_online_cpu(cpu)
per_cpu(mem->stat->count[MEM_CGROUP_ON_MOVE], cpu) += 1;
- spin_unlock(&mc.lock);
+ mem->nocpu_base.count[MEM_CGROUP_ON_MOVE] += 1;
+ spin_unlock(&mem->pcp_counter_lock);
+ put_online_cpus();
synchronize_rcu();
}
@@ -1131,10 +1134,13 @@ static void mem_cgroup_end_move(struct m
if (!mem)
return;
- spin_lock(&mc.lock);
- for_each_possible_cpu(cpu)
+ get_online_cpus();
+ spin_lock(&mem->pcp_counter_lock);
+ for_each_online_cpu(cpu)
per_cpu(mem->stat->count[MEM_CGROUP_ON_MOVE], cpu) -= 1;
- spin_unlock(&mc.lock);
+ mem->nocpu_base.count[MEM_CGROUP_ON_MOVE] -= 1;
+ spin_unlock(&mem->pcp_counter_lock);
+ put_online_cpus();
}
/*
* 2 routines for checking "mem" is under move_account() or not.
@@ -1735,6 +1741,17 @@ static void mem_cgroup_drain_pcp_counter
per_cpu(mem->stat->count[i], cpu) = 0;
mem->nocpu_base.count[i] += x;
}
+ /* need to clear ON_MOVE value, works as a kind of lock. */
+ per_cpu(mem->stat->count[MEM_CGROUP_ON_MOVE],cpu) = 0;
+ spin_unlock(&mem->pcp_counter_lock);
+}
+
+static void synchronize_mem_cgroup_on_move(struct mem_cgroup *mem, int cpu)
+{
+ int idx = MEM_CGROUP_ON_MOVE;
+
+ spin_lock(&mem->pcp_counter_lock);
+ per_cpu(mem->stat->count[idx],cpu) = mem->nocpu_base.count[idx];
spin_unlock(&mem->pcp_counter_lock);
}
@@ -1746,6 +1763,12 @@ static int __cpuinit memcg_cpu_hotplug_c
struct memcg_stock_pcp *stock;
struct mem_cgroup *iter;
+ if ((action == CPU_ONLINE)) {
+ for_each_mem_cgroup_all(iter)
+ synchronize_mem_cgroup_on_move(iter, cpu);
+ return NOTIFY_OK;
+ }
+
if ((action != CPU_DEAD) || action != CPU_DEAD_FROZEN)
return NOTIFY_OK;
--
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^ permalink raw reply [flat|nested] 4+ messages in thread