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From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>
Subject: [for-next][PATCH 09/12] ftrace: Decrement count for dyn_ftrace_total_info file
Date: Thu, 29 Jun 2017 20:38:40 -0400	[thread overview]
Message-ID: <20170630004022.936404524@goodmis.org> (raw)
In-Reply-To: 20170630003831.946074263@goodmis.org

[-- Attachment #1: 0009-ftrace-Decrement-count-for-dyn_ftrace_total_info-fil.patch --]
[-- Type: text/plain, Size: 1060 bytes --]

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

The dyn_ftrace_total_info file is used to show how many functions have been
converted into nops and can be used by ftrace. The problem is that it does
not get decremented when functions are removed (init boot code being freed,
and modules being freed). That means the number is very inaccurate everytime
functions are removed from the ftrace tables. Decrement it when functions
are removed.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 kernel/trace/ftrace.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 914539e3e301..7509ef9810bf 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -5705,6 +5705,7 @@ void ftrace_release_mod(struct module *mod)
 			if (pg == ftrace_pages)
 				ftrace_pages = next_to_ftrace_page(last_pg);
 
+			ftrace_update_tot_cnt -= pg->index;
 			*last_pg = pg->next;
 			order = get_count_order(pg->size / ENTRIES_PER_PAGE);
 			free_pages((unsigned long)pg->records, order);
-- 
2.10.2

  parent reply	other threads:[~2017-06-30  0:40 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-30  0:38 [for-next][PATCH 00/12] tracing: More updates for 4.13 Steven Rostedt
2017-06-30  0:38 ` [for-next][PATCH 01/12] ftrace: Add missing comment for FTRACE_OPS_FL_RCU Steven Rostedt
2017-06-30  0:38 ` [for-next][PATCH 02/12] tracing: Show address when function names are not found Steven Rostedt
2017-06-30  0:38 ` [for-next][PATCH 03/12] ftrace: Add :mod: caching infrastructure to trace_array Steven Rostedt
2017-06-30  0:38 ` [for-next][PATCH 04/12] ftrace: Have the cached module list show in set_ftrace_filter Steven Rostedt
2017-06-30  0:38 ` [for-next][PATCH 05/12] ftrace: Implement cached modules tracing on module load Steven Rostedt
2017-06-30  0:38 ` [for-next][PATCH 06/12] ftrace: Have cached module filters be an active filter Steven Rostedt
2017-06-30  0:38 ` [for-next][PATCH 07/12] sh/ftrace: Remove only user of ftrace_arch_read_dyn_info() Steven Rostedt
2017-06-30  0:38   ` Steven Rostedt
2017-06-30  0:38 ` [for-next][PATCH 08/12] ftrace: Remove unused function ftrace_arch_read_dyn_info() Steven Rostedt
2017-06-30  0:38 ` Steven Rostedt [this message]
2017-06-30  0:38 ` [for-next][PATCH 10/12] tracing: Add support for recording tgid of tasks Steven Rostedt
2017-06-30  0:38 ` [for-next][PATCH 11/12] tracing: Add support for display of tgid in trace output Steven Rostedt
2017-06-30  0:38 ` [for-next][PATCH 12/12] ftrace: Unlock hash mutex on failed allocation in process_mod_list() Steven Rostedt

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