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authorLai Jiangshan <laijs@cn.fujitsu.com>2009-03-13 17:51:27 +0800
committerIngo Molnar <mingo@elte.hu>2009-03-13 11:36:20 +0100
commite94142a67f8bad494c593f0a07c9fc2fbec98c0e (patch)
tree75419622606aa186da5592302c91cb93471bec26 /kernel
parent850a80cfaa5aec3e626eb3736eff890a80e4fa77 (diff)
ftrace: remove struct list_head from struct dyn_ftrace
Impact: save memory The struct dyn_ftrace table is very large, this patch will save about 50%. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Steven Rostedt <srostedt@redhat.com> LKML-Reference: <49BA2C9F.8020009@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/ftrace.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index bf78a4c75c6..90d5729afef 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -272,7 +272,7 @@ enum {
static int ftrace_filtered;
-static LIST_HEAD(ftrace_new_addrs);
+static struct dyn_ftrace *ftrace_new_addrs;
static DEFINE_MUTEX(ftrace_regex_lock);
@@ -409,8 +409,8 @@ ftrace_record_ip(unsigned long ip)
return NULL;
rec->ip = ip;
-
- list_add(&rec->list, &ftrace_new_addrs);
+ rec->flags = (unsigned long)ftrace_new_addrs;
+ ftrace_new_addrs = rec;
return rec;
}
@@ -716,19 +716,21 @@ unsigned long ftrace_update_tot_cnt;
static int ftrace_update_code(struct module *mod)
{
- struct dyn_ftrace *p, *t;
+ struct dyn_ftrace *p;
cycle_t start, stop;
start = ftrace_now(raw_smp_processor_id());
ftrace_update_cnt = 0;
- list_for_each_entry_safe(p, t, &ftrace_new_addrs, list) {
+ while (ftrace_new_addrs) {
/* If something went wrong, bail without enabling anything */
if (unlikely(ftrace_disabled))
return -1;
- list_del_init(&p->list);
+ p = ftrace_new_addrs;
+ ftrace_new_addrs = (struct dyn_ftrace *)p->flags;
+ p->flags = 0L;
/* convert record (i.e, patch mcount-call with NOP) */
if (ftrace_code_disable(mod, p)) {