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ftrace: Add information on number of page groups allocated

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Looking for ways to shrink the size of the dyn_ftrace structure, knowing the
information about how many pages and the number of groups of those pages, is
useful in working out the best ways to save on memory.

This adds one info print on how many groups of pages were used to allocate
the ftrace dyn_ftrace structures, and also shows the number of pages and
groups in the dyn_ftrace_total_info (which is used for debugging).

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware)
2019-10-01 14:38:07 -04:00
parent 77ac117b3a
commit da537f0aef
3 changed files with 31 additions and 6 deletions
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14
kernel/trace/ftrace.c
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@@ -2991,6 +2991,8 @@ static void ftrace_shutdown_sysctl(void)
static u64 ftrace_update_time;
unsigned long ftrace_update_tot_cnt;
unsigned long ftrace_number_of_pages;
unsigned long ftrace_number_of_groups;
static inline int ops_traces_mod(struct ftrace_ops *ops)
{
@@ -3115,6 +3117,9 @@ static int ftrace_allocate_records(struct ftrace_page *pg, int count)
goto again;
}
ftrace_number_of_pages += 1 << order;
ftrace_number_of_groups++;
cnt = (PAGE_SIZE << order) / ENTRY_SIZE;
pg->size = cnt;
@@ -3170,6 +3175,8 @@ ftrace_allocate_pages(unsigned long num_to_init)
start_pg = pg->next;
kfree(pg);
pg = start_pg;
ftrace_number_of_pages -= 1 << order;
ftrace_number_of_groups--;
}
pr_info("ftrace: FAILED to allocate memory for functions\n");
return NULL;
@@ -6173,6 +6180,8 @@ void ftrace_release_mod(struct module *mod)
free_pages((unsigned long)pg->records, order);
tmp_page = pg->next;
kfree(pg);
ftrace_number_of_pages -= 1 << order;
ftrace_number_of_groups--;
}
}
@@ -6514,6 +6523,8 @@ void ftrace_free_mem(struct module *mod, void *start_ptr, void *end_ptr)
*last_pg = pg->next;
order = get_count_order(pg->size / ENTRIES_PER_PAGE);
free_pages((unsigned long)pg->records, order);
ftrace_number_of_pages -= 1 << order;
ftrace_number_of_groups--;
kfree(pg);
pg = container_of(last_pg, struct ftrace_page, next);
if (!(*last_pg))
@@ -6569,6 +6580,9 @@ void __init ftrace_init(void)
__start_mcount_loc,
__stop_mcount_loc);
pr_info("ftrace: allocated %ld pages with %ld groups\n",
ftrace_number_of_pages, ftrace_number_of_groups);
set_ftrace_early_filters();
return;