From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Namhyung Kim <namhyung@kernel.org>
Subject: [for-next][PATCH 16/21] ftrace: Do not copy hash if O_TRUNC is set
Date: Thu, 03 Jul 2014 12:05:19 -0400 [thread overview]
Message-ID: <20140703161226.246757842@goodmis.org> (raw)
In-Reply-To: 20140703160503.006976702@goodmis.org
[-- Attachment #1: 0016-ftrace-Do-not-copy-hash-if-O_TRUNC-is-set.patch --]
[-- Type: text/plain, Size: 1368 bytes --]
From: Namhyung Kim <namhyung@kernel.org>
When a filter file is open for writing and O_TRUNC is set, there's no
need to copy and free the filter entries.
Link: http://lkml.kernel.org/p/1402474014-28655-2-git-send-email-namhyung@kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
kernel/trace/ftrace.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index e14ff4c1713e..232b898eebbd 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -3010,7 +3010,13 @@ ftrace_regex_open(struct ftrace_ops *ops, int flag,
hash = ops->filter_hash;
if (file->f_mode & FMODE_WRITE) {
- iter->hash = alloc_and_copy_ftrace_hash(FTRACE_HASH_DEFAULT_BITS, hash);
+ const int size_bits = FTRACE_HASH_DEFAULT_BITS;
+
+ if (file->f_flags & O_TRUNC)
+ iter->hash = alloc_ftrace_hash(size_bits);
+ else
+ iter->hash = alloc_and_copy_ftrace_hash(size_bits, hash);
+
if (!iter->hash) {
trace_parser_put(&iter->parser);
kfree(iter);
@@ -3019,10 +3025,6 @@ ftrace_regex_open(struct ftrace_ops *ops, int flag,
}
}
- if ((file->f_mode & FMODE_WRITE) &&
- (file->f_flags & O_TRUNC))
- ftrace_filter_reset(iter->hash);
-
if (file->f_mode & FMODE_READ) {
iter->pg = ftrace_pages_start;
--
2.0.0
next prev parent reply other threads:[~2014-07-03 16:12 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-03 16:05 [for-next][PATCH 00/21] tracing: Updates for 3.17 Steven Rostedt
2014-07-03 16:05 ` [for-next][PATCH 01/21] ftrace: Allow no regs if no more callbacks require it Steven Rostedt
2014-07-03 16:05 ` [for-next][PATCH 02/21] ftrace: Use macros for numbers in ftrace rec shift bits Steven Rostedt
2014-07-03 16:05 ` [for-next][PATCH 03/21] ftrace: Add ftrace_rec_counter() macro to simplify the code Steven Rostedt
2014-07-03 16:05 ` [for-next][PATCH 04/21] ftrace: Optimize function graph to be called directly Steven Rostedt
2014-07-10 17:45 ` Tuomas Tynkkynen
2014-07-10 18:01 ` Steven Rostedt
2014-07-12 3:36 ` Steven Rostedt
2014-07-12 3:37 ` Steven Rostedt
2014-07-14 13:46 ` Tuomas Tynkkynen
2014-07-14 16:14 ` Steven Rostedt
2014-07-03 16:05 ` [for-next][PATCH 05/21] ftrace: Add trampolines to enabled_functions debug file Steven Rostedt
2014-07-03 16:05 ` [for-next][PATCH 06/21] tracing: Change trace event sample to use strlcpy instead of strncpy Steven Rostedt
2014-07-03 16:05 ` [for-next][PATCH 07/21] ftrace: Simplify ftrace_hash_disable/enable path in ftrace_hash_move Steven Rostedt
2014-07-03 16:05 ` [for-next][PATCH 08/21] tracing: Move the trace_seq_* functions into its own trace_seq.c file Steven Rostedt
2014-07-03 16:05 ` [for-next][PATCH 09/21] tracing: Clean up trace_seq.c Steven Rostedt
2014-07-03 16:05 ` [for-next][PATCH 10/21] tracing: Make trace_seq_putmem_hex() more robust Steven Rostedt
2014-07-03 16:05 ` [for-next][PATCH 11/21] tracing: Remove trace_seq_reserve() Steven Rostedt
2014-07-03 16:05 ` [for-next][PATCH 12/21] tracing: Remove unnecessary null test before debugfs_remove() Steven Rostedt
2014-07-03 16:05 ` [for-next][PATCH 13/21] tracing: Add trace_seq_buffer_ptr() helper function Steven Rostedt
2014-07-03 16:05 ` [for-next][PATCH 14/21] ftrace: Get rid of obsolete global_start_up variable Steven Rostedt
2014-07-03 16:05 ` [for-next][PATCH 15/21] ftrace: Fix memory leak on failure path in ftrace_allocate_pages() Steven Rostedt
2014-07-03 16:05 ` Steven Rostedt [this message]
2014-07-03 16:05 ` [for-next][PATCH 17/21] tracing: Convert pr_warning() to pr_warn() in trace_events.c Steven Rostedt
2014-07-03 16:05 ` [for-next][PATCH 18/21] tracing: Add ftrace_graph_notrace boot parameter Steven Rostedt
2014-07-03 16:05 ` [for-next][PATCH 19/21] tracing: Improve message of empty set_graph_notrace file Steven Rostedt
2014-07-03 16:05 ` [for-next][PATCH 20/21] tracing: Improve message of empty set_ftrace_notrace file Steven Rostedt
2014-07-03 16:05 ` [for-next][PATCH 21/21] tracing: Add description of set_graph_notrace to tracing/README Steven Rostedt
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