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Commit e94142a6 authored by Lai Jiangshan's avatar Lai Jiangshan Committed by Ingo Molnar
Browse files

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: default avatarLai Jiangshan <laijs@cn.fujitsu.com>
Cc: Steven Rostedt <srostedt@redhat.com>
LKML-Reference: <49BA2C9F.8020009@cn.fujitsu.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 850a80cf

include/linux/ftrace.h

+0 −1
Original line number Diff line number Diff line
@@ -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;

kernel/trace/ftrace.c

+8 −6
Original line number Diff line number Diff line
@@ -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)) {