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authorAvi Kivity <avi@redhat.com>2011-12-25 15:44:43 +0200
committerAvi Kivity <avi@redhat.com>2011-12-27 11:22:24 +0200
commit9e31905f293ae84e4f120ed9e414031eaefa0bdf (patch)
tree153204ff0dca820e760007bc24075ec7fb46a276 /kernel/jump_label.c
parentff5c2c0316ff0e3e2dba3ca14167d994453df093 (diff)
parentb3d9468a8bd218a695e3a0ff112cd4efd27b670a (diff)
downloadlinux-sh-9e31905f293ae84e4f120ed9e414031eaefa0bdf.tar.gz
Merge remote-tracking branch 'tip/perf/core' into kvm-updates/3.3
* tip/perf/core: (66 commits) perf, x86: Expose perf capability to other modules perf, x86: Implement arch event mask as quirk x86, perf: Disable non available architectural events jump_label: Provide jump_label_key initializers jump_label, x86: Fix section mismatch perf, core: Rate limit perf_sched_events jump_label patching perf: Fix enable_on_exec for sibling events perf: Remove superfluous arguments perf, x86: Prefer fixed-purpose counters when scheduling perf, x86: Fix event scheduler for constraints with overlapping counters perf, x86: Implement event scheduler helper functions perf: Avoid a useless pmu_disable() in the perf-tick x86/tools: Add decoded instruction dump mode x86: Update instruction decoder to support new AVX formats x86/tools: Fix insn_sanity message outputs x86/tools: Fix instruction decoder message output x86: Fix instruction decoder to handle grouped AVX instructions x86/tools: Fix Makefile to build all test tools perf test: Soft errors shouldn't stop the "Validate PERF_RECORD_" test perf test: Validate PERF_RECORD_ events and perf_sample fields ... Signed-off-by: Avi Kivity <avi@redhat.com> * commit 'b3d9468a8bd218a695e3a0ff112cd4efd27b670a': (66 commits) perf, x86: Expose perf capability to other modules perf, x86: Implement arch event mask as quirk x86, perf: Disable non available architectural events jump_label: Provide jump_label_key initializers jump_label, x86: Fix section mismatch perf, core: Rate limit perf_sched_events jump_label patching perf: Fix enable_on_exec for sibling events perf: Remove superfluous arguments perf, x86: Prefer fixed-purpose counters when scheduling perf, x86: Fix event scheduler for constraints with overlapping counters perf, x86: Implement event scheduler helper functions perf: Avoid a useless pmu_disable() in the perf-tick x86/tools: Add decoded instruction dump mode x86: Update instruction decoder to support new AVX formats x86/tools: Fix insn_sanity message outputs x86/tools: Fix instruction decoder message output x86: Fix instruction decoder to handle grouped AVX instructions x86/tools: Fix Makefile to build all test tools perf test: Soft errors shouldn't stop the "Validate PERF_RECORD_" test perf test: Validate PERF_RECORD_ events and perf_sample fields ...
Diffstat (limited to 'kernel/jump_label.c')
-rw-r--r--kernel/jump_label.c49
1 files changed, 42 insertions, 7 deletions
diff --git a/kernel/jump_label.c b/kernel/jump_label.c
index 2af9027106a8..01d3b70fc98a 100644
--- a/kernel/jump_label.c
+++ b/kernel/jump_label.c
@@ -73,16 +73,47 @@ void jump_label_inc(struct jump_label_key *key)
}
EXPORT_SYMBOL_GPL(jump_label_inc);
-void jump_label_dec(struct jump_label_key *key)
+static void __jump_label_dec(struct jump_label_key *key,
+ unsigned long rate_limit, struct delayed_work *work)
{
if (!atomic_dec_and_mutex_lock(&key->enabled, &jump_label_mutex))
return;
- jump_label_update(key, JUMP_LABEL_DISABLE);
+ if (rate_limit) {
+ atomic_inc(&key->enabled);
+ schedule_delayed_work(work, rate_limit);
+ } else
+ jump_label_update(key, JUMP_LABEL_DISABLE);
+
jump_label_unlock();
}
EXPORT_SYMBOL_GPL(jump_label_dec);
+static void jump_label_update_timeout(struct work_struct *work)
+{
+ struct jump_label_key_deferred *key =
+ container_of(work, struct jump_label_key_deferred, work.work);
+ __jump_label_dec(&key->key, 0, NULL);
+}
+
+void jump_label_dec(struct jump_label_key *key)
+{
+ __jump_label_dec(key, 0, NULL);
+}
+
+void jump_label_dec_deferred(struct jump_label_key_deferred *key)
+{
+ __jump_label_dec(&key->key, key->timeout, &key->work);
+}
+
+
+void jump_label_rate_limit(struct jump_label_key_deferred *key,
+ unsigned long rl)
+{
+ key->timeout = rl;
+ INIT_DELAYED_WORK(&key->work, jump_label_update_timeout);
+}
+
static int addr_conflict(struct jump_entry *entry, void *start, void *end)
{
if (entry->code <= (unsigned long)end &&
@@ -113,7 +144,7 @@ static int __jump_label_text_reserved(struct jump_entry *iter_start,
* running code can override this to make the non-live update case
* cheaper.
*/
-void __weak arch_jump_label_transform_static(struct jump_entry *entry,
+void __weak __init_or_module arch_jump_label_transform_static(struct jump_entry *entry,
enum jump_label_type type)
{
arch_jump_label_transform(entry, type);
@@ -219,8 +250,13 @@ void jump_label_apply_nops(struct module *mod)
if (iter_start == iter_stop)
return;
- for (iter = iter_start; iter < iter_stop; iter++)
- arch_jump_label_transform_static(iter, JUMP_LABEL_DISABLE);
+ for (iter = iter_start; iter < iter_stop; iter++) {
+ struct jump_label_key *iterk;
+
+ iterk = (struct jump_label_key *)(unsigned long)iter->key;
+ arch_jump_label_transform_static(iter, jump_label_enabled(iterk) ?
+ JUMP_LABEL_ENABLE : JUMP_LABEL_DISABLE);
+ }
}
static int jump_label_add_module(struct module *mod)
@@ -260,8 +296,7 @@ static int jump_label_add_module(struct module *mod)
key->next = jlm;
if (jump_label_enabled(key))
- __jump_label_update(key, iter, iter_stop,
- JUMP_LABEL_ENABLE);
+ __jump_label_update(key, iter, iter_stop, JUMP_LABEL_ENABLE);
}
return 0;