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ftrace: remove struct list_head from struct dyn_ftrace

Browse source 
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>
This commit is contained in:
Lai Jiangshan 2009-03-13 17:51:27 +08:00 committed by Ingo Molnar
parent 850a80cfaa
commit e94142a67f
2 changed files with 8 additions and 7 deletions
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1
include/linux/ftrace.h
View file

@ -145,7 +145,6 @@ enum {
};
struct dyn_ftrace {
struct list_head list;
unsigned long ip; /* address of mcount call-site */
unsigned long flags;
struct dyn_arch_ftrace arch;

14
kernel/trace/ftrace.c
View file

@ -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)) {