nk:
https://lore.kernel.org/linux-trace-kernel/171509111465.162236.3795819216426570800.stgit@devnote2
Signed-off-by: Masami Hiramatsu (Google)
Suggested-by: Steven Rostedt (Google)
Signed-off-by: Steven Rostedt (Google)
---
kernel/trace/trace_selftest.c | 171 +---
From: "Steven Rostedt (Google)"
Instead of looping through all the elements of fgraph_array[] to see if
there's an gops attached to one and then calling its gops->func(). Create
a fgraph_array_bitmask that sets bits when an index in the array is
reserved (via the simple lru algorith
From: "Steven Rostedt (Google)"
Instead of iterating through the entire fgraph_array[] and seeing if one
of the bitmap bits are set to know to call the array's retfunc() function,
use for_each_set_bit() on the bitmap itself. This will only iterate for
the number of set bits.
From: "Steven Rostedt (VMware)"
Add boot up selftest that passes variables from a function entry to a
function exit, and make sure that they do get passed around.
Co-developed with Masami Hiramatsu:
Link:
https://lore.kernel.org/linux-trace-kernel/171509110271.162236.1104755149631974
From: "Steven Rostedt (VMware)"
Added functions that can be called by a fgraph_ops entryfunc and retfunc to
store state between the entry of the function being traced to the exit of
the same function. The fgraph_ops entryfunc() may call
fgraph_reserve_data() to store up to 32
From: "Steven Rostedt (VMware)"
The use of the task->trace_recursion for the logic used for the function
graph no-trace was a bit of an abuse of that variable. Now that there
exists global vars that are per stack for registered graph traces, use
that instead.
Link:
https://lo
From: "Steven Rostedt (VMware)"
The use of the task->trace_recursion for the logic used for the function
graph depth was a bit of an abuse of that variable. Now that there
exists global vars that are per stack for registered graph traces, use that
instead.
Link:
https://lore.ker
From: "Steven Rostedt (VMware)"
The use of the task->trace_recursion for the logic used for the
set_graph_funnction was a bit of an abuse of that variable. Now that there
exists global vars that are per stack for registered graph traces, use that
instead.
Link:
https://lore.ker
From: "Steven Rostedt (VMware)"
Add a "task variables" array on the tasks shadow ret_stack that is the
size of longs for each possible registered fgraph_ops. That's a total
of 16, taking up 8 * 16 = 128 bytes (out of a page size 4k).
This will allow for fgraph_ops to
From: "Steven Rostedt (VMware)"
Allow for instances to have their own ftrace_ops part of the fgraph_ops
that makes the funtion_graph tracer filter on the set_ftrace_filter file
of the instance and not the top instance.
Note that this also requires to update ftrace_graph_func() t
ace-kernel/171509103267.162236.6885097397289135378.stgit@devnote2
Signed-off-by: Masami Hiramatsu (Google)
Signed-off-by: Steven Rostedt (Google)
---
kernel/trace/fgraph.c | 71 ++-
1 file changed, 50 insertions(+), 21 deletions(-)
diff --git a/kernel/trace/
From: "Steven Rostedt (VMware)"
Some of the flags for ftrace_startup() may be exposed even when
CONFIG_DYNAMIC_FTRACE is not configured in. This is fine as the difference
between dynamic ftrace and static ftrace is done within the internals of
ftrace itself. No need to have use
From: "Steven Rostedt (VMware)"
Now that function graph tracing can handle more than one user, allow it to
be enabled in the ftrace instances. Note, the filtering of the functions is
still joined by the top level set_ftrace_filter and friends, as well as the
graph and nograph
From: "Steven Rostedt (VMware)"
Pass the fgraph_ops structure to the function graph callbacks. This will
allow callbacks to add a descriptor to a fgraph_ops private field that wil
be added in the future and use it for the callbacks. This will be useful
when more than one ca
mi Hiramatsu (Google)
Signed-off-by: Steven Rostedt (Google)
---
kernel/trace/fgraph.c | 19 ---
1 file changed, 16 insertions(+), 3 deletions(-)
diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c
index aae51f746828..8de2a2662281 100644
--- a/kernel/trace/fgraph.c
+++ b/k
From: "Steven Rostedt (VMware)"
The function pointers ftrace_graph_entry and ftrace_graph_return are no
longer called via the function_graph tracer. Instead, an array structure is
now used that will allow for multiple users of the function_graph
infrastructure. The variables are
From: "Steven Rostedt (VMware)"
Allow for multiple users to attach to function graph tracer at the same
time. Only 16 simultaneous users can attach to the tracer. This is because
there's an array that stores the pointers to the attached fgraph_ops. When
a function being traced is ent
From: "Steven Rostedt (VMware)"
Add an array structure that will eventually allow the function graph tracer
to have up to 16 simultaneous callbacks attached. It's an array of 16
fgraph_ops pointers, that is assigned when one is registered. On entry of a
function the entry of the
From: "Steven Rostedt (VMware)"
In order to make it possible to have multiple callbacks registered with the
function_graph tracer, the retstack needs to be converted from an array of
ftrace_ret_stack structures to an array of longs. This will allow to store
the list of callbacks on
From: "Steven Rostedt (VMware)"
Instead of using "ALIGN()", use BUILD_BUG_ON() as the structures should
always be divisible by sizeof(long).
Co-developed with Masami Hiramatsu:
Link:
https://lore.kernel.org/linux-trace-kernel/171509093949.162236.14518699447151894536.stgit@
index number
ftrace: Add multiple fgraph storage selftest
Steven Rostedt (Google) (2):
function_graph: Use for_each_set_bit() in __ftrace_return_to_handler()
function_graph: Use bitmask to loop on fgraph entry
Steven Rostedt (VMware) (15):
function_graph: Convert ret_stack
On Tue, 7 May 2024 23:09:22 +0900
"Masami Hiramatsu (Google)" wrote:
> @@ -109,6 +244,21 @@ ftrace_push_return_trace(unsigned long ret, unsigned
> long func,
> if (!current->ret_stack)
> return -EBUSY;
>
> + /*
> + * At first, check whether the previous fgraph
On Tue, 7 May 2024 23:08:00 +0900
"Masami Hiramatsu (Google)" wrote:
> Steven Rostedt (VMware) (15):
> function_graph: Convert ret_stack to a series of longs
> fgraph: Use BUILD_BUG_ON() to make sure we have structures divisible by
> long
> fun
On Fri, 24 May 2024 12:50:08 +0200
"Linux regression tracking (Thorsten Leemhuis)"
wrote:
> > - Affected Versions: Before kernel version 6.8.10, the bug caused a
> > quick display of a kernel trace dump before the shutdown/reboot
> > completed. Starting from version 6.8.10 and continuing into
On Fri, 24 May 2024 12:50:08 +0200
"Linux regression tracking (Thorsten Leemhuis)"
wrote:
> [CCing a few people]
>
Thanks for the Cc.
> On 24.05.24 12:31, Ilkka Naulapää wrote:
> >
> > I have encountered a critical bug in the Linux vanilla kernel that
> > leads to a kernel panic during the
On Fri, 24 May 2024 10:37:54 +0900
Masami Hiramatsu (Google) wrote:
> > >
> > > #ifdef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS
> > > struct ftrace_regs {
> > > + /*
> > > + * On the x86_64, the ftrace_regs saves;
> > > + * rax, rcx, rdx, rdi, rsi, r8, r9, rbp, rip and rsp.
> > > + * Also
On Tue, 7 May 2024 23:08:35 +0900
"Masami Hiramatsu (Google)" wrote:
> From: Masami Hiramatsu (Google)
>
> Add ftrace_regs definition for x86_64 in the ftrace header to
> clarify what register will be accessible from ftrace_regs.
>
> Signed-off-by: Masami Hiramatsu (Google)
> ---
> Changes
On Tue, 7 May 2024 23:08:12 +0900
"Masami Hiramatsu (Google)" wrote:
> From: Masami Hiramatsu (Google)
>
> To clarify what will be expected on ftrace_regs, add a comment to the
> architecture independent definition of the ftrace_regs.
>
> Signed-off-by: Masami Hiramatsu (Google)
> Acked-by:
ng to sched_dl class only.
> */
> if (tracing_dl || (wakeup_dl && !dl_task(p)) ||
> - (wakeup_rt && !dl_task(p) && !rt_task(p)) ||
> + (wakeup_rt && !realtime_task(p)) ||
> (!dl_task(p) && (p->prio >= wakeup_prio || p->prio >=
> current->prio)))
> return;
>
Reviewed-by: Steven Rostedt (Google)
From: "Steven Rostedt (Google)"
The change to update the permissions of the eventfs_inode had the
misconception that using the tracefs_inode would find all the
eventfs_inodes that have been updated and reset them on remount.
The problem with this approach is that the eventfs_inodes
From: "Steven Rostedt (Google)"
When the inode is being dropped from the dentry, the TRACEFS_EVENT_INODE
flag needs to be cleared to prevent a remount from calling
eventfs_remount() on the tracefs_inode private data. There's a race
between the inode is dropped (and the dentry freed
From: "Steven Rostedt (Google)"
When a remount happens, if a gid or uid is specified update the inodes to
have the same gid and uid. This will allow the simplification of the
permissions logic for the dynamically created files and directories.
Cc: sta...@vger.kernel.org
Fixes: baa
From: "Steven Rostedt (Google)"
The directories require unique inode numbers but all the eventfs files
have the same inode number. Prevent the directories from having the same
inode numbers as the files as that can confuse some tooling.
Cc: sta...@vger.kernel.org
Fixes: 834bf76add3e6
It should be done in the
drop_inode callback.
git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git
eventfs/urgent
Head SHA1: 41b7db11bcac4638fa489c58d35e7d2146b665ab
Steven Rostedt (Google) (4):
eventfs: Keep the directories from having the same inode number as files
On Wed, 22 May 2024 12:45:04 -0400
Steven Rostedt wrote:
> From: "Steven Rostedt (Google)"
>
> The iput callback was added because the remount could call into the
> eventfs code and touch the ei->entry_attrs array, which could have been
> freed when an eve
From: "Steven Rostedt (Google)"
The iput callback was added because the remount could call into the
eventfs code and touch the ei->entry_attrs array, which could have been
freed when an eventfs directory is freed (via a synthetic event). But the
entry_attrs was freed incorrectly a
On Tue, 21 May 2024 09:11:08 -0600
Shuah Khan wrote:
> Any thoughts on this patch?
Sorry, this one fell through the cracks. Daniel Bristot has been
maintaining his tools and I thought this was one of his changes.
I'll take a look at it.
-- Steve
On Mon, 20 May 2024 15:02:26 +0800
"Ubisectech Sirius" wrote:
> Hello.
> We are Ubisectech Sirius Team, the vulnerability lab of China ValiantSec.
> Recently, our team has discovered a issue in Linux kernel 6.7. Attached to
> the email were a PoC file of the issue.
>
> Stack dump:
> UBSAN:
On Fri, 17 May 2024 15:40:08 +0200
Petr Pavlu wrote:
> The reader code in rb_get_reader_page() swaps a new reader page into the
> ring buffer by doing cmpxchg on old->list.prev->next to point it to the
> new page. Following that, if the operation is successful,
> old->list.next->prev gets
On Fri, 17 May 2024 10:36:37 -0700
Guenter Roeck wrote:
> Building csky:allmodconfig (and others) ... failed
> --
> Error log:
> In file included from include/trace/trace_events.h:419,
> from include/trace/define_trace.h:102,
> from
On Fri, 17 May 2024 10:08:51 +0300
Jani Nikula wrote:
> On Thu, 16 May 2024, Steven Rostedt wrote:
> > There's over 700 users of __assign_str() and because coccinelle does not
> > handle the TRACE_EVENT() macro I ended up using the following sed script:
> >
> >
From: "Steven Rostedt (Google)"
The sub-buffer pages are held in an unsigned long array, and when it is
passed to virt_to_page() a cast is needed.
Link: https://lore.kernel.org/all/20240515124808.06279...@canb.auug.org.au/
Fixes: 117c39200d9d ("ring-buffer: Introducing ring
On Fri, 10 May 2024 12:03:12 +0100
Vincent Donnefort wrote:
> > I'm not particularly happy about us calling vm_insert_pages with NULL
> > pointers stored in pages.
> >
> > Should we instead do
> >
> > if (WARN_ON_ONCE(s >= nr_subbufs)) {
> > err = -EINVAL;
> > goto out;
> > }
> >
> >
On Tue, 30 Apr 2024 12:13:51 +0100
Vincent Donnefort wrote:
> +#ifdef CONFIG_MMU
> +static int __rb_map_vma(struct ring_buffer_per_cpu *cpu_buffer,
> + struct vm_area_struct *vma)
> +{
> + unsigned long nr_subbufs, nr_pages, vma_pages, pgoff = vma->vm_pgoff;
> +
by: xu xin
> Reviewed-by: Yunkai Zhang
> Cc: Yang Yang
> Cc: Liu Chun
> Cc: Xuexin Jiang
> ---
From just a tracing point of view:
Reviewed-by: Steven Rostedt (Google)
-- Steve
| 10 --
> 2 files changed, 1 insertion(+), 10 deletions(-)
Reviewed-by: Steven Rostedt (Google)
-- Steve
Trampolines can only be created if modules are supported */
> diff --git a/arch/x86/kernel/kprobes/core.c b/arch/x86/kernel/kprobes/core.c
Acked-by: Steven Rostedt (Google)
-- Steve
On Sat, 4 May 2024 13:35:26 +
"Dr. David Alan Gilbert" wrote:
> Hi,
> I've just posted a patch 'ftrace: Remove unused list 'ftrace_direct_funcs''
> that clears out some old code, but while at it I noticed the global
> 'ftrace_direct_func_count'.
>
> As far as I can tell, it's never
On Thu, 2 May 2024 16:13:59 -0700
"Paul E. McKenney" wrote:
> Very good, and thank you!
>
> I will drop it from RCU as soon as it shows up in either -next or in
> mainline.
Sounds good.
I'm currently working on updates to get into -rc7 and plan to add my next
work on top of that (I know, I
On Thu, 2 May 2024 15:58:53 -0700
Beau Belgrave wrote:
> It's not an issue on the matching/logic. However, you do get an extra
> byte alloc (which doesn't bother me in this edge case).
Figured as much, but since there was no mention of it, I decided to bring
it up.
I'll take this as-is then.
> > Thank you,
> >
> > > [1]
> > > https://lore.kernel.org/all/cover.1710877680.git@cloudflare.com/
> > >
> > > Reported-by: Jakub Kicinski
> > > Reported-by: Alexei Starovoitov
> > > Reported-by: Chris Mason
> > >
On Tue, 23 Apr 2024 16:23:37 +
Beau Belgrave wrote:
> When the ABI was updated to prevent same name w/different args, it
> missed an important corner case when fields don't end with a space.
> Typically, space is used for fields to help separate them, like
> "u8 field1; u8 field2". If no
On Wed, 17 Apr 2024 11:28:30 +0800
Zheng Yejian wrote:
> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> index da1710499698..e05d3e3dc06a 100644
> --- a/kernel/trace/ftrace.c
> +++ b/kernel/trace/ftrace.c
> @@ -1581,7 +1581,7 @@ static struct dyn_ftrace *lookup_rec(unsigned long
>
From: "Steven Rostedt (Google)"
The events directory gets its permissions from the root inode. But this
can cause an inconsistency if the instances directory changes its
permissions, as the permissions of the created directories under it should
inherit the permissions of the instances
From: "Steven Rostedt (Google)"
Treat the events directory the same as other directories when it comes to
permissions. The events directory was considered different because it's
dentry is persistent, whereas the other directory dentries are created
when accessed. But the way tracefs no
From: "Steven Rostedt (Google)"
There's an inconsistency with the way permissions are handled in tracefs.
Because the permissions are generated when accessed, they default to the
root inode's permission if they were never set by the user. If the user
sets the permissions, then a f
From: "Steven Rostedt (Google)"
The toplevel events directory is really no different than the events
directory of instances. Having the two be different caused
inconsistencies and made it harder to fix the permissions bugs.
Make all events directories act the same.
Cc: sta...@vger.
From: "Steven Rostedt (Google)"
The freeing of eventfs_inode via a kfree_rcu() callback. But the content
of the eventfs_inode was being freed after the last kref. This is
dangerous, as changes are being made that can access the content of an
eventfs_inode from an RCU loop.
Instea
From: "Steven Rostedt (Google)"
If the instances directory's permissions were never change, then have it
and its children use the mount point permissions as the default.
Currently, the permissions of instance directories are determined by the
instance directory's permissi
that the
iteration of the list only needs to be protected by rcu_read_lock().
Steven Rostedt (Google) (6):
eventfs: Free all of the eventfs_inode after RCU
tracefs: Reset permissions on remount if permissions are options
tracefs: Still use mount point as default permissions for instances
On Thu, 02 May 2024 11:15:48 -0400
Steven Rostedt wrote:
> +/*
> + * On a remount of tracefs, if UID or GID options are set, then
> + * the mount point inode permissions should be used.
> + * Reset the saved permission flags appropriately.
> + */
> +void eventfs_remount(struct
From: "Steven Rostedt (Google)"
The events directory gets its permissions from the root inode. But this
can cause an inconsistency if the instances directory changes its
permissions, as the permissions of the created directories under it should
inherit the permissions of the instances
From: "Steven Rostedt (Google)"
Treat the events directory the same as other directories when it comes to
permissions. The events directory was considered different because it's
dentry is persistent, whereas the other directory dentries are created
when accessed. But the way tracefs no
the node
from the link list, and free the node via call_rcu() so that the
iteration of the list only needs to be protected by rcu_read_lock().
Steven Rostedt (Google) (5):
tracefs: Reset permissions on remount if permissions are options
tracefs: Still use mount point as default
From: "Steven Rostedt (Google)"
If the instances directory's permissions were never change, then have it
and its children use the mount point permissions as the default.
Currently, the permissions of instance directories are determined by the
instance directory's permissi
From: "Steven Rostedt (Google)"
The toplevel events directory is really no different than the events
directory of instances. Having the two be different caused
inconsistencies and made it harder to fix the permissions bugs.
Make all events directories act the same.
Cc: sta...@vger.
From: "Steven Rostedt (Google)"
There's an inconsistency with the way permissions are handled in tracefs.
Because the permissions are generated when accessed, they default to the
root inode's permission if they were never set by the user. If the user
sets the permissions, then a f
On Thu, 2 May 2024 06:49:18 +
Tze-nan Wu (吳澤南) wrote:
> Good news, this patch works, the test has passed, no more Kasan report
> in my environment.
Great to hear!
>
> my environment:
> arm64 + kasan + swtag based kasan + kernel-6.6.18
>
> Really appreciate, and learn a lot from the
On Thu, 2 May 2024 14:38:32 +0100
Vincent Donnefort wrote:
> > > + while (s < nr_subbufs && p < nr_pages) {
> > > + struct page *page = virt_to_page(cpu_buffer->subbuf_ids[s]);
> > > + int off = 0;
> > > +
> > > + for (; off < (1 << (subbuf_order)); off++, page++) {
> > >
On Wed, 1 May 2024 23:56:26 +0900
Masami Hiramatsu (Google) wrote:
> Looks good to me.
>
> Reviewed-by: Masami Hiramatsu (Google)
Thanks Masami,
Although Tze-nan pointed out a issue with this patch.
I just published v2, can you review that one too?
Thanks,
-- Steve
From: "Steven Rostedt (Google)"
Synthetic events create and destroy tracefs files when they are created
and removed. The tracing subsystem has its own file descriptor
representing the state of the events attached to the tracefs files.
There's a race between the eventfs files and
On Thu, 2 May 2024 03:10:24 +
Tze-nan Wu (吳澤南) wrote:
> >
> Sorry for my late reply, I'm testing the patch on my machine now.
> Test will be done in four hours.
>
> There's something I'm worrying about in the patch,
> what I'm worrying about is commented in the code below.
>
>
From: "Steven Rostedt (Google)"
The events directory gets its permissions from the root inode. But this
can cause an inconsistency if the instances directory changes its
permissions, as the permissions of the created directories under it should
inherit the permissions of the instances
From: "Steven Rostedt (Google)"
Treat the events directory the same as other directories when it comes to
permissions. The events directory was considered different because it's
dentry is persistent, whereas the other directory dentries are created
when accessed. But the way tracefs no
From: "Steven Rostedt (Google)"
The toplevel events directory is really no different than the events
directory of instances. Having the two be different caused
inconsistencies and made it harder to fix the permissions bugs.
Make all events directories act the same.
Cc: sta...@vger.
From: "Steven Rostedt (Google)"
If the instances directory's permissions were never change, then have it
and its children use the mount point permissions as the default.
Currently, the permissions of instance directories are determined by the
instance directory's permissi
.
Steven Rostedt (Google) (5):
tracefs: Reset permissions on remount if permissions are options
tracefs: Still use mount point as default permissions for instances
eventfs: Do not differentiate the toplevel events directory
eventfs: Do not treat events directory different than
From: "Steven Rostedt (Google)"
There's an inconsistency with the way permissions are handled in tracefs.
Because the permissions are generated when accessed, they default to the
root inode's permission if they were never set by the user. If the user
sets the permissions, then a f
From: "Steven Rostedt (Google)"
Synthetic events create and destroy tracefs files when they are created
and removed. The tracing subsystem has its own file descriptor
representing the state of the events attached to the tracefs files.
There's a race between the eventfs files and
On Sun, 28 Apr 2024 20:28:37 -0400
Steven Rostedt wrote:
> > Looking for any suggestion or solution, appreciate.
>
> Yeah, I do not think eventfs should be involved in this. It needs to be
> protected at a higher level (in the synthetic/dynamic event code).
>
> I'm
On Fri, 26 Apr 2024 15:34:08 +0800
Tze-nan wu wrote:
> "tracing_event_file" is at the risk of use-after-free due to the race of
> two functions "tracing_open_file_tr" and "synth_event_release".
> Specifically, it could be freed by synth_event_release before
> tracing_open_file_tr has the
On Thu, 25 Apr 2024 13:31:53 -0700
Andrii Nakryiko wrote:
I'm just coming back from Japan (work and then a vacation), and
catching up on my email during the 6 hour layover in Detroit.
> Hey Masami,
>
> I can't really review most of that code as I'm completely unfamiliar
> with all those inner
On Tue, 23 Apr 2024 12:04:15 -0400
"Liam R. Howlett" wrote:
> > Nit: For all labels, please add a space before them. Otherwise, diffs will
> > show "unlock" as the function and not "ring_buffer_map", making it harder
> > to find where the change is.
> >
>
> Isn't the inclusion of a space
On Sat, 20 Apr 2024 11:50:29 +0800
"Bang Li" wrote:
> Thank you for your explanation, let me understand this. How about
> replacing ftrace_disabled with unlike(ftrace_disabled)?
Why? They are slow paths. No need to optimize them.
-- Steve
On Mon, 15 Apr 2024 21:50:20 +0900
"Masami Hiramatsu (Google)" wrote:
> @@ -27,23 +28,157 @@
>
> #define FGRAPH_RET_SIZE sizeof(struct ftrace_ret_stack)
> #define FGRAPH_RET_INDEX DIV_ROUND_UP(FGRAPH_RET_SIZE, sizeof(long))
> +
> +/*
> + * On entry to a function (via function_graph_enter()),
On Fri, 19 Apr 2024 16:00:20 +0800
Jason Xing wrote:
> If other experts see this thread, please help me. I would appreciate
> it. I have strong interests and feel strong responsibility to
> implement something like this patch series. It can be very useful!!
I'm not a networking expert, but as
On Fri, 19 Apr 2024 22:38:44 +0800
"Bang Li" wrote:
> Use the existing function ftrace_is_dead to replace the variable to make
> the code clearer.
>
> Signed-off-by: Bang Li
> ---
> kernel/trace/ftrace.c | 46 +--
> 1 file changed, 23 insertions(+), 23
d new flag to skip timestamp recording.
> >
> > Overview
> >
> > This series does major 2 changes, enable multiple function-graphs on
> > the ftrace (e.g. allow function-graph on sub instances) and rewrite the
> > fprobe on this function-graph.
> >
On Thu, 18 Apr 2024 09:55:55 +0300
Mike Rapoport wrote:
Hi Mike,
Thanks for doing this review!
> > +/**
> > + * struct trace_buffer_meta - Ring-buffer Meta-page description
> > + * @meta_page_size:Size of this meta-page.
> > + * @meta_struct_len: Size of this structure.
> > + *
On Mon, 15 Apr 2024 18:40:23 +0900
"Masami Hiramatsu (Google)" wrote:
> Check the number of probe target symbols in the target module when
> the module is loaded. If the probe is not on the unique name symbols
> in the module, it will be rejected at that point.
>
> Note that the symbol which
() to convert it to its value:
(((REC->path_dir) == 1) ? "->" : "<-")
So that user space tools, such as perf and trace-cmd, can parse it
correctly.
Reported-by: Luca Ceresoli
Fixes: 6e588a0d839b5 ("ASoC: dapm: Consolidate path trace events")
Signed-off-by:
On Tue, 16 Apr 2024 04:08:46 +0200
Luca Ceresoli wrote:
> Thanks for the insight. I'm definitely trying to fix this based on your
> hint as soon as I get my hand on a board.
I have a patch I forgot to send out. Let me do that now.
-- Steve
On Mon, 18 Mar 2024 16:43:07 +0100
Luca Ceresoli wrote:
> However the arrows are still reversed.
This requires a kernel change. The problem is that the print fmt has:
print fmt: "%c%s %s %s %s %s", (int) REC->path_node && (int) REC->path_connect
? '*' : ' ', __get_str(wname),
On Sat, 13 Apr 2024 12:53:38 +0200
Peter Zijlstra wrote:
> On Fri, Apr 12, 2024 at 09:37:24AM -0700, Beau Belgrave wrote:
>
> > > Anyway, since we typically run stuff from NMI context, accessing user
> > > data is 'interesting'. As such I would really like to make this work
> > > depend on the
On Thu, 11 Apr 2024 08:15:05 -0700
Kees Cook wrote:
> This looks good to me. If tracing wants to take it:
>
> Acked-by: Kees Cook
>
> If not, I can take it in my tree if I get a tracing Ack. :)
You can take it.
Acked-by: Steven Rostedt (Google)
-- Steve
From: "Steven Rostedt (Google)"
For a persistent ring buffer that is saved across boots, if function
tracing was performed in the previous boot, it only saves the address of
the functions and uses "%pS" to print their names. But the current boot,
those functions may be in
From: "Steven Rostedt (Google)"
Use the saved text_delta and data_delta of a persistent memory mapped ring
buffer that was saved from a previous boot, and use the delta in the trace
event print output so that strings and functions show up normally.
That is, for an event like tra
From: "Steven Rostedt (Google)"
If an instance is mapped to memory on boot up, create a new file called
"last_boot_info" that will hold information that can be used to properly
parse the raw data in the ring buffer.
It will export the delta of the addresses for tex
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