Commit 85ae32ae authored by Steven Rostedt's avatar Steven Rostedt Committed by Steven Rostedt
Browse files

ftrace: Replace record newlist with record page list 



As new functions come in to be initalized from mcount to nop,
they are done by groups of pages. Whether it is the core kernel
or a module. There's no need to keep track of these on a per record
basis.

At startup, and as any module is loaded, the functions to be
traced are stored in a group of pages and added to the function
list at the end. We just need to keep a pointer to the first
page of the list that was added, and use that to know where to
start on the list for initializing functions.

Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent a7900875

include/linux/ftrace.h

+1 −4
Original line number Diff line number Diff line
@@ -173,10 +173,7 @@ struct dyn_ftrace { 
		unsigned long		ip; /* address of mcount call-site */

		struct dyn_ftrace	*freelist;

	};

	union {

	unsigned long		flags;

		struct dyn_ftrace	*newlist;

	};

	struct dyn_arch_ftrace		arch;

};

kernel/trace/ftrace.c

+37 −31
Original line number Diff line number Diff line
@@ -977,8 +977,6 @@ static struct ftrace_ops global_ops = { 
	.filter_hash		= EMPTY_HASH,

};



static struct dyn_ftrace *ftrace_new_addrs;



static DEFINE_MUTEX(ftrace_regex_lock);



struct ftrace_page {
@@ -988,6 +986,8 @@ struct ftrace_page { 
	int			size;

};



static struct ftrace_page *ftrace_new_pgs;



#define ENTRY_SIZE sizeof(struct dyn_ftrace)

#define ENTRIES_PER_PAGE (PAGE_SIZE / ENTRY_SIZE)
@@ -1445,8 +1445,6 @@ ftrace_record_ip(unsigned long ip) 
		return NULL;



	rec->ip = ip;

	rec->newlist = ftrace_new_addrs;

	ftrace_new_addrs = rec;



	return rec;

}
@@ -1936,9 +1934,11 @@ static int ops_traces_mod(struct ftrace_ops *ops) 


static int ftrace_update_code(struct module *mod)

{

	struct ftrace_page *pg;

	struct dyn_ftrace *p;

	cycle_t start, stop;

	unsigned long ref = 0;

	int i;



	/*

	 * When adding a module, we need to check if tracers are
@@ -1960,14 +1960,14 @@ static int ftrace_update_code(struct module *mod) 
	start = ftrace_now(raw_smp_processor_id());

	ftrace_update_cnt = 0;



	while (ftrace_new_addrs) {

	for (pg = ftrace_new_pgs; pg; pg = pg->next) {



		for (i = 0; i < pg->index; i++) {

			/* If something went wrong, bail without enabling anything */

			if (unlikely(ftrace_disabled))

				return -1;



		p = ftrace_new_addrs;

		ftrace_new_addrs = p->newlist;

			p = &pg->records[i];

			p->flags = ref;



			/*
@@ -1994,6 +1994,9 @@ static int ftrace_update_code(struct module *mod) 
					ftrace_bug(failed, p->ip);

			}

		}

	}



	ftrace_new_pgs = NULL;



	stop = ftrace_now(raw_smp_processor_id());

	ftrace_update_time = stop - start;
@@ -3632,6 +3635,9 @@ static int ftrace_process_locs(struct module *mod, 
			break;

	}



	/* These new locations need to be initialized */

	ftrace_new_pgs = pg;



	/*

	 * We only need to disable interrupts on start up

	 * because we are modifying code that an interrupt

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