From: Masami Hiramatsu (Google)
With ftrace boot-time selftest, kmemleak reported some memory leaks in
the new test case for function graph storage for multiple tracers.
unreferenced object 0x888005060080 (size 32):
comm "swapper/0", pid 1, jiffies 4294676440
hex dump (firs
From: Masami Hiramatsu (Google)
Skip recording calltime and rettime if the fgraph_ops does not need it.
This is a kind of performance optimization for fprobe. Since the fprobe
user does not use these entries, recording timestamp in fgraph is just
a overhead (e.g. eBPF, ftrace). So introduce the
From: Masami Hiramatsu (Google)
Update fprobe documentation for the new fprobe on function-graph
tracer. This includes some bahvior changes and pt_regs to
ftrace_regs interface change.
Signed-off-by: Masami Hiramatsu (Google)
---
Changes in v2:
- Update @fregs parameter explanation
From: Masami Hiramatsu (Google)
This test case repeats define and undefine the fprobe dynamic event to
ensure that the fprobe does not cause any issue with such operations.
Signed-off-by: Masami Hiramatsu (Google)
---
.../test.d/dynevent/add_remove_fprobe_repeat.tc| 19
From: Masami Hiramatsu (Google)
Since the fprobe event does not support maxactive anymore, stop
testing the maxactive syntax error checking.
Signed-off-by: Masami Hiramatsu (Google)
---
.../ftrace/test.d/dynevent/fprobe_syntax_errors.tc |4 +---
1 file changed, 1 insertion(+), 3 deletions
From: Masami Hiramatsu (Google)
Remove depercated fprobe::nr_maxactive. This involves fprobe events to
rejects the maxactive number.
Signed-off-by: Masami Hiramatsu (Google)
---
Changes in v2:
- Newly added.
---
include/linux/fprobe.h |2 --
kernel/trace/trace_fprobe.c | 44
From: Masami Hiramatsu (Google)
Since the new fgraph requires to initialize fgraph_ops.ops.func_hash before
calling register_ftrace_graph(), initialize it with default (tracing all
functions) parameter.
Signed-off-by: Masami Hiramatsu (Google)
---
kernel/trace/ftrace.c |4
1 file
From: Masami Hiramatsu (Google)
Rewrite fprobe implementation on function-graph tracer.
Major API changes are:
- 'nr_maxactive' field is deprecated.
- This depends on CONFIG_DYNAMIC_FTRACE_WITH_ARGS or
!CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS, and
CONFIG_HAVE_FUNCTION_GRAPH
From: Masami Hiramatsu (Google)
Add CONFIG_HAVE_FTRACE_GRAPH_FUNC kconfig in addition to ftrace_graph_func
macro check. This is for the other feature (e.g. FPROBE) which requires to
access ftrace_regs from fgraph_ops::entryfunc() can avoid compiling if
the fgraph can not pass the valid
From: Masami Hiramatsu (Google)
Enable kprobe_multi feature if CONFIG_FPROBE is enabled. The pt_regs is
converted from ftrace_regs by ftrace_partial_regs(), thus some registers
may always returns 0. But it should be enough for function entry (access
arguments) and exit (access return value
From: Masami Hiramatsu (Google)
Allow fprobe events to be enabled with CONFIG_DYNAMIC_FTRACE_WITH_ARGS.
With this change, fprobe events mostly use ftrace_regs instead of pt_regs.
Note that if the arch doesn't enable HAVE_PT_REGS_COMPAT_FTRACE_REGS,
fprobe events will not be able to be used
From: Masami Hiramatsu (Google)
Add ftrace_fill_perf_regs() which should be compatible with the
perf_fetch_caller_regs(). In other words, the pt_regs returned from the
ftrace_fill_perf_regs() must satisfy 'user_mode(regs) == false' and can be
used for stack tracing.
Signed-off-
From: Masami Hiramatsu (Google)
Add ftrace_partial_regs() which converts the ftrace_regs to pt_regs.
This is for the eBPF which needs this to keep the same pt_regs interface
to access registers.
Thus when replacing the pt_regs with ftrace_regs in fprobes (which is
used by kprobe_multi eBPF event
From: Masami Hiramatsu (Google)
Change the fprobe exit handler to use ftrace_regs structure instead of
pt_regs. This also introduce HAVE_PT_REGS_TO_FTRACE_REGS_CAST which means
the ftrace_regs's memory layout is equal to the pt_regs so that those are
able to cast. Fprobe introduces
From: Masami Hiramatsu (Google)
This allows fprobes to be available with CONFIG_DYNAMIC_FTRACE_WITH_ARGS
instead of CONFIG_DYNAMIC_FTRACE_WITH_REGS, then we can enable fprobe
on arm64.
Signed-off-by: Masami Hiramatsu (Google)
Acked-by: Florent Revest
---
Changes in v6:
- Keep using
From: Masami Hiramatsu (Google)
Pass ftrace_regs to the fgraph_ops::retfunc(). If ftrace_regs is not
available, it passes a NULL instead. User callback function can access
some registers (including return address) via this ftrace_regs.
Signed-off-by: Masami Hiramatsu (Google)
---
Changes in
From: Masami Hiramatsu (Google)
Use ftrace_regs instead of fgraph_ret_regs for tracing return value
on function_graph tracer because of simplifying the callback interface.
The CONFIG_HAVE_FUNCTION_GRAPH_RETVAL is also replaced by
CONFIG_HAVE_FUNCTION_GRAPH_FREGS.
Signed-off-by: Masami
From: Masami Hiramatsu (Google)
Pass ftrace_regs to the fgraph_ops::entryfunc(). If ftrace_regs is not
available, it passes a NULL instead. User callback function can access
some registers (including return address) via this ftrace_regs.
Signed-off-by: Masami Hiramatsu (Google)
---
Changes in
From: Masami Hiramatsu (Google)
Rename ftrace_regs_return_value to ftrace_regs_get_return_value as same as
other ftrace_regs_get/set_* APIs.
Signed-off-by: Masami Hiramatsu (Google)
Acked-by: Mark Rutland
---
Changes in v6:
- Moved to top of the series.
Changes in v3:
- Newly added
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: Mark Rutland
---
Changes in v8:
- Update that the saved registers depends on the
From: Masami Hiramatsu (Google)
Since the register_ftrace_graph() assigns a new fgraph_ops to
fgraph_array before registring it by ftrace_startup_subops(), the new
fgraph_ops can be used in function_graph_enter().
In most cases, it is still OK because those fgraph_ops's hashtable is
al
e given
'fprobe' data structure pointer is still valid. Note that it is
possible to unregister fprobe before the return callback runs. Thus
the address validation must be done before using it in the return
callback.
Download
This series can be applied against the ftrace/for-next bra
From: Masami Hiramatsu (Google)
Add a test case for tracepoint events on modules. This checks if it can add
and remove the events correctly.
Signed-off-by: Masami Hiramatsu (Google)
---
Changes in v3:
- Add not-loaded module test.
---
tools/testing/selftests/ftrace/config
From: Masami Hiramatsu (Google)
Support raw tracepoint events on future loaded (unloaded) modules.
This allows user to create raw tracepoint events which can be used from
module's __init functions.
Note: since the kernel does not have any information about the tracepoints
in the unl
From: Masami Hiramatsu (Google)
Support raw tracepoint event on module by fprobe events.
Since it only uses for_each_kernel_tracepoint() to find a tracepoint,
the tracepoints on modules are not handled. Thus if user specified a
tracepoint on a module, it shows an error.
This adds new
From: Masami Hiramatsu (Google)
Add for_each_tracepoint_in_module() function to iterate tracepoints in
a module. This API is needed for handling tracepoints in a loading
module from tracepoint_module_notifier callback function.
This also update for_each_module_tracepoint() to pass the module to
From: Masami Hiramatsu (Google)
Add for_each_module_tracepoint() for iterating over tracepoints
on modules. This is similar to the for_each_kernel_tracepoint()
but only for the tracepoints on modules (not including kernel
built-in tracepoints).
Signed-off-by: Masami Hiramatsu (Google
r can specify any tracepoint name for tracepoint events. It will be
just ignored.
You can download this series from;
https://git.kernel.org/pub/scm/linux/kernel/git/mhiramat/linux.git
topic/tprobe-on-module
Thank you,
---
Masami Hiramatsu (Google) (5):
tracepoint: Support iterating
From: Masami Hiramatsu (Google)
Since str_has_prefix() takes the prefix as the 2nd argument and the string
as the first, is_cfi_preamble_symbol() always fails to check the prefix.
Fix the function parameter order so that it correctly check the prefix.
Fixes: de02f2ac5d8c ("kprobes: Pro
From: Masami Hiramatsu (Google)
Add uprobes entry to MAINTAINERS to clarify the maintainers.
Suggested-by: Peter Zijlstra
Signed-off-by: Masami Hiramatsu (Google)
---
MAINTAINERS | 13 +
1 file changed, 13 insertions(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index da5352dbd4f3
From: Masami Hiramatsu (Google)
The kernel test robot reported that the find_module() is not available
if CONFIG_MODULES=n.
Fix this error by hiding find_modules() in #ifdef CONFIG_MODULES with
related rcu locks as try_module_get_by_name().
Reported-by: kernel test robot
Closes:
https
From: Masami Hiramatsu (Google)
The kernel test robot reported that the find_module() is not available
if CONFIG_MODULES=n.
Fix this error by hiding find_modules() in #ifdef CONFIG_MODULES with
related rcu locks as try_module_get_by_name().
Reported-by: kernel test robot
Closes:
https
From: Masami Hiramatsu (Google)
Currently, kprobe event checks whether the target symbol name is unique
or not, so that it does not put a probe on an unexpected place. But this
skips the check if the target is on a module because the module may not
be loaded.
To fix this issue, this patch
From: Masami Hiramatsu (Google)
Currently, kprobe event checks whether the target symbol name is unique
or not, so that it does not put a probe on an unexpected place. But this
skips the check if the target is on a module because the module may not
be loaded.
To fix this issue, this patch
From: Masami Hiramatsu (Google)
Skip push operation only when there is no fgraph_ops which sets retfunc.
This is for optimizing performance of fprobe on fgraph. Since the major
use case of fprobe is putting a probe on function entry and another
probe on exit. Since these probes are independent
From: Masami Hiramatsu (Google)
Skip recording calltime and rettime if the fgraph_ops does not need it.
This is a kind of performance optimization for fprobe. Since the fprobe
user does not use these entries, recording timestamp in fgraph is just
a overhead (e.g. eBPF, ftrace). So introduce the
From: Masami Hiramatsu (Google)
Update fprobe documentation for the new fprobe on function-graph
tracer. This includes some bahvior changes and pt_regs to
ftrace_regs interface change.
Signed-off-by: Masami Hiramatsu (Google)
---
Changes in v2:
- Update @fregs parameter explanation
From: Masami Hiramatsu (Google)
This test case repeats define and undefine the fprobe dynamic event to
ensure that the fprobe does not cause any issue with such operations.
Signed-off-by: Masami Hiramatsu (Google)
---
.../test.d/dynevent/add_remove_fprobe_repeat.tc| 19
From: Masami Hiramatsu (Google)
Since the fprobe event does not support maxactive anymore, stop
testing the maxactive syntax error checking.
Signed-off-by: Masami Hiramatsu (Google)
---
.../ftrace/test.d/dynevent/fprobe_syntax_errors.tc |4 +---
1 file changed, 1 insertion(+), 3 deletions
From: Masami Hiramatsu (Google)
Remove depercated fprobe::nr_maxactive. This involves fprobe events to
rejects the maxactive number.
Signed-off-by: Masami Hiramatsu (Google)
---
Changes in v2:
- Newly added.
---
include/linux/fprobe.h |2 --
kernel/trace/trace_fprobe.c | 44
From: Masami Hiramatsu (Google)
Rewrite fprobe implementation on function-graph tracer.
Major API changes are:
- 'nr_maxactive' field is deprecated.
- This depends on CONFIG_DYNAMIC_FTRACE_WITH_ARGS or
!CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS, and
CONFIG_HAVE_FUNCTION_GRAPH
From: Masami Hiramatsu (Google)
Add CONFIG_HAVE_FTRACE_GRAPH_FUNC kconfig in addition to ftrace_graph_func
macro check. This is for the other feature (e.g. FPROBE) which requires to
access ftrace_regs from fgraph_ops::entryfunc() can avoid compiling if
the fgraph can not pass the valid
From: Masami Hiramatsu (Google)
Enable kprobe_multi feature if CONFIG_FPROBE is enabled. The pt_regs is
converted from ftrace_regs by ftrace_partial_regs(), thus some registers
may always returns 0. But it should be enough for function entry (access
arguments) and exit (access return value
From: Masami Hiramatsu (Google)
Allow fprobe events to be enabled with CONFIG_DYNAMIC_FTRACE_WITH_ARGS.
With this change, fprobe events mostly use ftrace_regs instead of pt_regs.
Note that if the arch doesn't enable HAVE_PT_REGS_COMPAT_FTRACE_REGS,
fprobe events will not be able to be used
From: Masami Hiramatsu (Google)
Add ftrace_fill_perf_regs() which should be compatible with the
perf_fetch_caller_regs(). In other words, the pt_regs returned from the
ftrace_fill_perf_regs() must satisfy 'user_mode(regs) == false' and can be
used for stack tracing.
Signed-off-
From: Masami Hiramatsu (Google)
Add ftrace_partial_regs() which converts the ftrace_regs to pt_regs.
This is for the eBPF which needs this to keep the same pt_regs interface
to access registers.
Thus when replacing the pt_regs with ftrace_regs in fprobes (which is
used by kprobe_multi eBPF event
From: Masami Hiramatsu (Google)
Change the fprobe exit handler to use ftrace_regs structure instead of
pt_regs. This also introduce HAVE_PT_REGS_TO_FTRACE_REGS_CAST which means
the ftrace_regs's memory layout is equal to the pt_regs so that those are
able to cast. Fprobe introduces
From: Masami Hiramatsu (Google)
This allows fprobes to be available with CONFIG_DYNAMIC_FTRACE_WITH_ARGS
instead of CONFIG_DYNAMIC_FTRACE_WITH_REGS, then we can enable fprobe
on arm64.
Signed-off-by: Masami Hiramatsu (Google)
Acked-by: Florent Revest
---
Changes in v6:
- Keep using
From: Masami Hiramatsu (Google)
Pass ftrace_regs to the fgraph_ops::retfunc(). If ftrace_regs is not
available, it passes a NULL instead. User callback function can access
some registers (including return address) via this ftrace_regs.
Signed-off-by: Masami Hiramatsu (Google)
---
Changes in
From: Masami Hiramatsu (Google)
Use ftrace_regs instead of fgraph_ret_regs for tracing return value
on function_graph tracer because of simplifying the callback interface.
The CONFIG_HAVE_FUNCTION_GRAPH_RETVAL is also replaced by
CONFIG_HAVE_FUNCTION_GRAPH_FREGS.
Signed-off-by: Masami
From: Masami Hiramatsu (Google)
Pass ftrace_regs to the fgraph_ops::entryfunc(). If ftrace_regs is not
available, it passes a NULL instead. User callback function can access
some registers (including return address) via this ftrace_regs.
Signed-off-by: Masami Hiramatsu (Google)
---
Changes in
From: Masami Hiramatsu (Google)
Rename ftrace_regs_return_value to ftrace_regs_get_return_value as same as
other ftrace_regs_get/set_* APIs.
Signed-off-by: Masami Hiramatsu (Google)
Acked-by: Mark Rutland
---
Changes in v6:
- Moved to top of the series.
Changes in v3:
- Newly added
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: Mark Rutland
---
Changes in v8:
- Update that the saved registers depends on the
wnload
This series can be applied against the ftrace/for-next branch in
linux-trace tree.
This series can also be found below branch.
https://git.kernel.org/pub/scm/linux/kernel/git/mhiramat/linux.git/log/?h=topic/fprobe-on-fgraph
Thank you,
---
Masami Hiramatsu (Google) (19):
From: Masami Hiramatsu (Google)
Skip recording calltime and rettime if the fgraph_ops does not need it.
This is a kind of performance optimization for fprobe. Since the fprobe
user does not use these entries, recording timestamp in fgraph is just
a overhead (e.g. eBPF, ftrace). So introduce the
From: Masami Hiramatsu (Google)
Update fprobe documentation for the new fprobe on function-graph
tracer. This includes some bahvior changes and pt_regs to
ftrace_regs interface change.
Signed-off-by: Masami Hiramatsu (Google)
---
Changes in v2:
- Update @fregs parameter explanation
From: Masami Hiramatsu (Google)
This test case repeats define and undefine the fprobe dynamic event to
ensure that the fprobe does not cause any issue with such operations.
Signed-off-by: Masami Hiramatsu (Google)
---
.../test.d/dynevent/add_remove_fprobe_repeat.tc| 19
From: Masami Hiramatsu (Google)
Since the fprobe event does not support maxactive anymore, stop
testing the maxactive syntax error checking.
Signed-off-by: Masami Hiramatsu (Google)
---
.../ftrace/test.d/dynevent/fprobe_syntax_errors.tc |4 +---
1 file changed, 1 insertion(+), 3 deletions
From: Masami Hiramatsu (Google)
Remove depercated fprobe::nr_maxactive. This involves fprobe events to
rejects the maxactive number.
Signed-off-by: Masami Hiramatsu (Google)
---
Changes in v2:
- Newly added.
---
include/linux/fprobe.h |2 --
kernel/trace/trace_fprobe.c | 44
From: Masami Hiramatsu (Google)
Rewrite fprobe implementation on function-graph tracer.
Major API changes are:
- 'nr_maxactive' field is deprecated.
- This depends on CONFIG_DYNAMIC_FTRACE_WITH_ARGS or
!CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS, and
CONFIG_HAVE_FUNCTION_GRAPH
From: Masami Hiramatsu (Google)
Add CONFIG_HAVE_FTRACE_GRAPH_FUNC kconfig in addition to ftrace_graph_func
macro check. This is for the other feature (e.g. FPROBE) which requires to
access ftrace_regs from fgraph_ops::entryfunc() can avoid compiling if
the fgraph can not pass the valid
From: Masami Hiramatsu (Google)
Enable kprobe_multi feature if CONFIG_FPROBE is enabled. The pt_regs is
converted from ftrace_regs by ftrace_partial_regs(), thus some registers
may always returns 0. But it should be enough for function entry (access
arguments) and exit (access return value
From: Masami Hiramatsu (Google)
Allow fprobe events to be enabled with CONFIG_DYNAMIC_FTRACE_WITH_ARGS.
With this change, fprobe events mostly use ftrace_regs instead of pt_regs.
Note that if the arch doesn't enable HAVE_PT_REGS_COMPAT_FTRACE_REGS,
fprobe events will not be able to be used
From: Masami Hiramatsu (Google)
Add ftrace_fill_perf_regs() which should be compatible with the
perf_fetch_caller_regs(). In other words, the pt_regs returned from the
ftrace_fill_perf_regs() must satisfy 'user_mode(regs) == false' and can be
used for stack tracing.
Signed-off-
From: Masami Hiramatsu (Google)
Add ftrace_partial_regs() which converts the ftrace_regs to pt_regs.
This is for the eBPF which needs this to keep the same pt_regs interface
to access registers.
Thus when replacing the pt_regs with ftrace_regs in fprobes (which is
used by kprobe_multi eBPF event
From: Masami Hiramatsu (Google)
Change the fprobe exit handler to use ftrace_regs structure instead of
pt_regs. This also introduce HAVE_PT_REGS_TO_FTRACE_REGS_CAST which means
the ftrace_regs's memory layout is equal to the pt_regs so that those are
able to cast. Fprobe introduces
From: Masami Hiramatsu (Google)
This allows fprobes to be available with CONFIG_DYNAMIC_FTRACE_WITH_ARGS
instead of CONFIG_DYNAMIC_FTRACE_WITH_REGS, then we can enable fprobe
on arm64.
Signed-off-by: Masami Hiramatsu (Google)
Acked-by: Florent Revest
---
Changes in v6:
- Keep using
From: Masami Hiramatsu (Google)
Pass ftrace_regs to the fgraph_ops::retfunc(). If ftrace_regs is not
available, it passes a NULL instead. User callback function can access
some registers (including return address) via this ftrace_regs.
Signed-off-by: Masami Hiramatsu (Google)
---
Changes in
From: Masami Hiramatsu (Google)
Use ftrace_regs instead of fgraph_ret_regs for tracing return value
on function_graph tracer because of simplifying the callback interface.
The CONFIG_HAVE_FUNCTION_GRAPH_RETVAL is also replaced by
CONFIG_HAVE_FUNCTION_GRAPH_FREGS.
Signed-off-by: Masami
From: Masami Hiramatsu (Google)
Pass ftrace_regs to the fgraph_ops::entryfunc(). If ftrace_regs is not
available, it passes a NULL instead. User callback function can access
some registers (including return address) via this ftrace_regs.
Signed-off-by: Masami Hiramatsu (Google)
---
Changes in
From: Masami Hiramatsu (Google)
Rename ftrace_regs_return_value to ftrace_regs_get_return_value as same as
other ftrace_regs_get/set_* APIs.
Signed-off-by: Masami Hiramatsu (Google)
Acked-by: Mark Rutland
---
Changes in v6:
- Moved to top of the series.
Changes in v3:
- Newly added
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: Mark Rutland
---
Changes in v8:
- Update that the saved registers depends on the
plied against the ftrace/for-next branch in
linux-trace tree.
This series can also be found below branch.
https://git.kernel.org/pub/scm/linux/kernel/git/mhiramat/linux.git/log/?h=topic/fprobe-on-fgraph
Thank you,
---
Masami Hiramatsu (Google) (18):
tracing: Add a comment about f
From: Masami Hiramatsu (Google)
This cleanup all kprobe events code is not related to the selftest
itself, and it can fail by the reason unrelated to this test.
If the test is successful, the generated events are cleaned up.
And if not, we cannot guarantee that the kprobe events will work
From: Masami Hiramatsu (Google)
Cleanup the redundant WARN_ON_ONCE(cond) + pr_warn(msg) into
WARN_ONCE(cond, msg). Also add some WARN_ONCE() for hitcount check.
These WARN_ONCE() errors makes it easy to handle errors from ktest.
Suggested-by: Steven Rostedt
Signed-off-by: Masami Hiramatsu
From: Masami Hiramatsu (Google)
The kprobes and synth event generation test modules add events and lock
(get a reference) those event file reference in module init function,
and unlock and delete it in module exit function. This is because those
are designed for playing as modules.
If we make
() and
pr_warn() instead of removing WARN_ONCE() because this warning messages
are needed to ktest to handle errors.
Thank you,
---
Masami Hiramatsu (Google) (3):
tracing: Build event generation tests only as modules
tracing/kprobe: Integrate test warnings into WARN_ONCE
tracing
From: Masami Hiramatsu (Google)
This cleanup all kprobe events code is not related to the selftest
itself, and it can fail by the reason unrelated to this test.
If the test is successful, the generated events are cleaned up.
And if not, we cannot guarantee that the kprobe events will work
From: Masami Hiramatsu (Google)
Since the kprobe-events selftest shows OK or NG with the reason, the
WARN_ON_ONCE()s for each place are redundant. Let's remove it.
Signed-off-by: Masami Hiramatsu (Google)
---
kernel/trace/trace_kprobe.c | 26 +-
1 file change
From: Masami Hiramatsu (Google)
The kprobes and synth event generation test modules add events and lock
(get a reference) those event file reference in module init function,
and unlock and delete it in module exit function. This is because those
are designed for playing as modules.
If we make
(because there are warning messages
already) and the cleanup code is redundant. This series fixes those issues.
Thank you,
---
Masami Hiramatsu (Google) (3):
tracing: Build event generation tests only as modules
tracing/kprobe: Remove unneeded WARN_ON_ONCE() in selftests
tracing
From: Masami Hiramatsu (Google)
Add a test case for tracepoint events on modules. This checks if it can add
and remove the events correctly.
Signed-off-by: Masami Hiramatsu (Google)
---
tools/testing/selftests/ftrace/config |1 +
.../test.d/dynevent
From: Masami Hiramatsu (Google)
Support raw tracepoint event on module by fprobe events.
Since it only uses for_each_kernel_tracepoint() to find a tracepoint,
the tracepoints on modules are not handled. Thus if user specified a
tracepoint on a module, it shows an error.
This adds new
From: Masami Hiramatsu (Google)
Add for_each_module_tracepoint() for iterating over tracepoints
on modules. This is similar to the for_each_kernel_tracepoint()
but only for the tracepoints on modules (not including kernel
built-in tracepoints).
Signed-off-by: Masami Hiramatsu (Google
Hi,
This series implements the tracepoint events on modules.
This version separates a patch for tracepoint subsystem from
fprobe-event patch, and adds a selftests for tracepoint
events on modules.
Thank you,
---
Masami Hiramatsu (Google) (3):
tracepoint: Support iterating over
From: Masami Hiramatsu (Google)
Support raw tracepoint event on module by fprobe events.
Since it only uses for_each_kernel_tracepoint() to find a tracepoint,
the tracepoints on modules are not handled. Thus if user specified a
tracepoint on a module, it shows an error.
This adds new
From: Masami Hiramatsu (Google)
This cleanup all kprobe events code is not related to the selftest
itself, and it can fail by the reason unrelated to this test.
If the test is successful, the generated events are cleaned up.
And if not, we cannot guarantee that the kprobe events will work
From: Masami Hiramatsu (Google)
Since the kprobe-events selftest shows OK or NG with the reason, the
WARN_ON_ONCE()s for each place are redundant. Let's remove it.
Signed-off-by: Masami Hiramatsu (Google)
---
kernel/trace/trace_kprobe.c | 26 +-
1 file change
From: Masami Hiramatsu (Google)
Since the kprobes and synth event generation tests adds and enable
generated events in init_module() and delete it in exit_module(),
if we make it as built-in, those events are left in kernel and cause
kprobe event self-test failure.
[ 97.349708
main
problem is that the test module should not be built-in. But I also think
this WARNING message is useless (because there are warning messages already)
and the cleanup code is redundant. This series fixes those issues.
Thank you,
---
Masami Hiramatsu (Google) (3):
tracing: Build event
From: Masami Hiramatsu (Google)
Skip recording calltime and rettime if the fgraph_ops does not need it.
This is a kind of performance optimization for fprobe. Since the fprobe
user does not use these entries, recording timestamp in fgraph is just
a overhead (e.g. eBPF, ftrace). So introduce the
From: Masami Hiramatsu (Google)
Update fprobe documentation for the new fprobe on function-graph
tracer. This includes some bahvior changes and pt_regs to
ftrace_regs interface change.
Signed-off-by: Masami Hiramatsu (Google)
---
Changes in v2:
- Update @fregs parameter explanation
are)
Signed-off-by: Masami Hiramatsu (Google)
---
Changes in v2:
- Make description lines shorter than 76 chars.
---
include/linux/trace_recursion.h |7 ---
kernel/trace/trace.h |9 +
kernel/trace/trace_functions_graph.c | 10 ++
3 files chan
From: Masami Hiramatsu (Google)
This test case repeats define and undefine the fprobe dynamic event to
ensure that the fprobe does not cause any issue with such operations.
Signed-off-by: Masami Hiramatsu (Google)
---
.../test.d/dynevent/add_remove_fprobe_repeat.tc| 19
From: Masami Hiramatsu (Google)
Since the fprobe event does not support maxactive anymore, stop
testing the maxactive syntax error checking.
Signed-off-by: Masami Hiramatsu (Google)
---
.../ftrace/test.d/dynevent/fprobe_syntax_errors.tc |4 +---
1 file changed, 1 insertion(+), 3 deletions
From: Masami Hiramatsu (Google)
Remove depercated fprobe::nr_maxactive. This involves fprobe events to
rejects the maxactive number.
Signed-off-by: Masami Hiramatsu (Google)
---
Changes in v2:
- Newly added.
---
include/linux/fprobe.h |2 --
kernel/trace/trace_fprobe.c | 44
From: Masami Hiramatsu (Google)
Rewrite fprobe implementation on function-graph tracer.
Major API changes are:
- 'nr_maxactive' field is deprecated.
- This depends on CONFIG_DYNAMIC_FTRACE_WITH_ARGS or
!CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS, and
CONFIG_HAVE_FUNCTION_GRAPH
From: Masami Hiramatsu (Google)
Add CONFIG_HAVE_FTRACE_GRAPH_FUNC kconfig in addition to ftrace_graph_func
macro check. This is for the other feature (e.g. FPROBE) which requires to
access ftrace_regs from fgraph_ops::entryfunc() can avoid compiling if
the fgraph can not pass the valid
From: Masami Hiramatsu (Google)
Enable kprobe_multi feature if CONFIG_FPROBE is enabled. The pt_regs is
converted from ftrace_regs by ftrace_partial_regs(), thus some registers
may always returns 0. But it should be enough for function entry (access
arguments) and exit (access return value
From: Masami Hiramatsu (Google)
Allow fprobe events to be enabled with CONFIG_DYNAMIC_FTRACE_WITH_ARGS.
With this change, fprobe events mostly use ftrace_regs instead of pt_regs.
Note that if the arch doesn't enable HAVE_PT_REGS_COMPAT_FTRACE_REGS,
fprobe events will not be able to be used
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