On 07/01/2013 08:41 PM, fangdong wrote:
> On 06/29/2013 05:11 AM, Jiaxing Wang wrote:
>> After pread(), file->f_pos and m->read_pos get different,
>> and lseek() to m->read_pos did not update file->f_pos, then
>> a subsequent read may read from a wrong position, t
+count, but this read from position 0*/
read(fd, str2, count);
printf("read:%s\n", str2);
Signed-off-by: Jiaxing Wang
---
fs/seq_file.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/seq_file.c b/fs/seq_file.c
index 774c1eb..4b22b26 100644
--- a/fs/se
kernel parameter, like the following:
ftrace=function ftrace_filter=kfree trace_options=func_stack_trace
Jiaxing Wang (3):
tracing: Update instance_rmdir() to use tracefs_remove_recursive.
tracing: Make tracing work when debugfs is not compiled or
initialized.
tracing: Apply tracer
Update instancd_rmdir to use tracefs_remove_recursive instead of
debugfs_remove_recursive.This was left in the transition from debugfs
to tracefs.
Signed-off-by: Jiaxing Wang
---
kernel/trace/trace.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/trace/trace.c b
cer().
To keep trace_boot_options_buf from overwritten by strsep() and strstrip()
and can be parsed again, a copy is made for them to work on.
Also make register_tracer() be __init to access the __init data, and
in fact register_tracer is only called from __init code.
Signed-off-by: Jiaxing Wang
---
kerne
initialized and get a populated tracefs.
We also need to make global_trace.dir not NULL in order to pass the checks
in tracing_get_dentry() and add_tracer_options().
Signed-off-by: Jiaxing Wang
---
kernel/trace/Kconfig | 1 -
kernel/trace/trace.c | 29 +
2 files changed
Sorry for the last patch, please use this to add stub for
debugfs_create_automount().
>From b3b877d8d9fd9795ea1055042039a272e47f4dc5 Mon Sep 17 00:00:00 2001
From: Jiaxing Wang
Date: Mon, 19 Oct 2015 09:46:12 +0800
Subject: [PATCH] debugfs: Add stub function for debugfs_create_automount().
s which then are matched
with other function's 'return_to_handler' on the stack and resulting the
wrong output above.
To fix this, we can disable the profiling of dumpstack utilities.
Signed-off-by: Jiaxing Wang
---
arch/x86/kernel/Makefile | 3 +++
1 file changed, 3 insertions(+)
diff --gi
On 04/19/2014 11:18 PM, Steven Rostedt wrote:
> On Sat, 19 Apr 2014 15:45:46 +0800
> Jiaxing Wang wrote:
>
>> When function_graph tracer is enabled, we get stack trace like this:
>>
>> DepthSize Location(88 entries)
>> -
The first patch makes trace_stack to skip 4 instead of 3 function
return addresses on the stack when ftrace_ops_list_func is used in ftrace,
and added a function to check for this.
The second correct the documentation of two functions in ftrace.c
Jiaxing Wang (2):
tracing/trace_stack:Skip 4
Signed-off-by: Jiaxing Wang
---
kernel/trace/ftrace.c | 6 ++
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index e7e7302..57cdaba 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -3644,8 +3644,7 @@ int
remain static.
Signed-off-by: Jiaxing Wang
---
kernel/trace/ftrace.c | 5 +
kernel/trace/trace.h | 1 +
kernel/trace/trace_stack.c | 8 ++--
3 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 1fd4b94..e7e7302 100644
On 10/25/2013 06:15 PM, Gu Zheng wrote:
> This issue was first pointed out by Jiaxing Wang several months ago, but no
> further comments:
> https://lkml.org/lkml/2013/6/29/41
>
> As we know pread() does not change f_pos, so after pread(), file->f_pos
> and m->read_p
On Wed, Nov 04, 2015 at 10:03:39AM -0500, Steven Rostedt wrote:
> On Wed, 4 Nov 2015 09:11:18 +0800
> Jiaxing Wang wrote:
>
> > Currently tracing_init_dentry() returns -ENODEV when debugfs is not
> > initialized, which causes tracefs not populated with tracing files and
&
On Thu, Nov 05, 2015 at 10:54:32AM -0500, Steven Rostedt wrote:
> On Thu, 5 Nov 2015 13:23:01 +0800
> Jiaxing Wang wrote:
>
> > > > - /*
> > > > -* As there may still be users that expect the tracing
> > > > -* files t
configured in and can manually mount tracefs. But return -ENODEV
if debugfs is configured in but not initialized or failed to create
automount point as that would break backward compatibility with older
tools.
Signed-off-by: Jiaxing Wang
---
kernel/trace/trace.c | 4 +++-
1 file changed, 3 insertions
On Thu, Oct 29, 2015 at 03:07:58AM -0400, Steven Rostedt wrote:
> static ssize_t
> ftrace_event_pid_write(struct file *filp, const char __user *ubuf,
> size_t cnt, loff_t *ppos)
> @@ -1711,6 +1727,12 @@ ftrace_event_pid_write(struct file *filp, const char
> __user *ubuf,
>
Add stub for debugfs_create_automount() for when debugfs is not configured
in.
Signed-off-by: Jiaxing Wang
---
include/linux/debugfs.h | 8
1 file changed, 8 insertions(+)
diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h
index 19c066d..981e53a 100644
--- a/include/linux
initialized and get a populated tracefs.
We also need to make global_trace.dir not NULL in order to pass the checks
in tracing_get_dentry() and add_tracer_options().
Also added stub debugfs_create_automount() for when debugfs is not
configured in.
Signed-off-by: Jiaxing Wang
---
include/linux
cer().
To make trace_boot_options_buf can be parsed again, a comma and a space
is put back if they were replaced by strsep and strstrip respectively.
Also make register_tracer() be __init to access the __init data, and
in fact register_tracer is only called from __init code.
Signed-off-by: Jiaxing Wang
--
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