- 04 6月, 2010 1 次提交
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由 Steven Rostedt 提交于
The ftrace_preempt_disable/enable functions were to address a recursive race caused by the function tracer. The function tracer traces all functions which makes it easily susceptible to recursion. One area was preempt_enable(). This would call the scheduler and the schedulre would call the function tracer and loop. (So was it thought). The ftrace_preempt_disable/enable was made to protect against recursion inside the scheduler by storing the NEED_RESCHED flag. If it was set before the ftrace_preempt_disable() it would not call schedule on ftrace_preempt_enable(), thinking that if it was set before then it would have already scheduled unless it was already in the scheduler. This worked fine except in the case of SMP, where another task would set the NEED_RESCHED flag for a task on another CPU, and then kick off an IPI to trigger it. This could cause the NEED_RESCHED to be saved at ftrace_preempt_disable() but the IPI to arrive in the the preempt disabled section. The ftrace_preempt_enable() would not call the scheduler because the flag was already set before entring the section. This bug would cause a missed preemption check and cause lower latencies. Investigating further, I found that the recusion caused by the function tracer was not due to schedule(), but due to preempt_schedule(). Now that preempt_schedule is completely annotated with notrace, the recusion no longer is an issue. Reported-by: NThomas Gleixner <tglx@linutronix.de> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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- 15 5月, 2010 3 次提交
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由 Li Zefan 提交于
ftrace_trace_stack() and frace_trace_userstacke() take a struct ring_buffer argument, not struct trace_array. Commit e77405ad("tracing: pass around ring buffer instead of tracer") made this change. Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com> LKML-Reference: <4BE77C14.5010806@cn.fujitsu.com> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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由 Steven Rostedt 提交于
The filter_active and enable both use an int (4 bytes each) to set a single flag. We can save 4 bytes per event by combining the two into a single integer. text data bss dec hex filename 4913961 1088356 861512 6863829 68bbd5 vmlinux.orig 4894944 1018052 861512 6774508 675eec vmlinux.id 4894871 1012292 861512 6768675 674823 vmlinux.flags This gives us another 5K in savings. The modification of both the enable and filter fields are done under the event_mutex, so it is still safe to combine the two. Note: Although Mathieu gave his Acked-by, he would like it documented that the reads of flags are not protected by the mutex. The way the code works, these reads will not break anything, but will have a residual effect. Since this behavior is the same even before this patch, describing this situation is left to another patch, as this patch does not change the behavior, but just brought it to Mathieu's attention. v2: Updated the event trace self test to for this change. Acked-by: NMathieu Desnoyers <mathieu.desnoyers@efficios.com> Acked-by: NMasami Hiramatsu <mhiramat@redhat.com> Acked-by: NFrederic Weisbecker <fweisbec@gmail.com> Cc: Tom Zanussi <tzanussi@gmail.com> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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由 Steven Rostedt 提交于
Move the defined fields from the event to the class structure. Since the fields of the event are defined by the class they belong to, it makes sense to have the class hold the information instead of the individual events. The events of the same class would just hold duplicate information. After this change the size of the kernel dropped another 3K: text data bss dec hex filename 4913961 1088356 861512 6863829 68bbd5 vmlinux.orig 4900252 1057412 861512 6819176 680d68 vmlinux.regs 4900375 1053380 861512 6815267 67fe23 vmlinux.fields Although the text increased, this was mainly due to the C files having to adapt to the change. This is a constant increase, where new tracepoints will not increase the Text. But the big drop is in the data size (as well as needed allocations to hold the fields). This will give even more savings as more tracepoints are created. Note, if just TRACE_EVENT()s are used and not DECLARE_EVENT_CLASS() with several DEFINE_EVENT()s, then the savings will be lost. But we are pushing developers to consolidate events with DEFINE_EVENT() so this should not be an issue. The kprobes define a unique class to every new event, but are dynamic so it should not be a issue. The syscalls however have a single class but the fields for the individual events are different. The syscalls use a metadata to define the fields. I moved the fields list from the event to the metadata and added a "get_fields()" function to the class. This function is used to find the fields. For normal events and kprobes, get_fields() just returns a pointer to the fields list_head in the class. For syscall events, it returns the fields list_head in the metadata for the event. v2: Fixed the syscall fields. The syscall metadata needs a list of fields for both enter and exit. Acked-by: NFrederic Weisbecker <fweisbec@gmail.com> Acked-by: NMathieu Desnoyers <mathieu.desnoyers@efficios.com> Acked-by: NMasami Hiramatsu <mhiramat@redhat.com> Cc: Tom Zanussi <tzanussi@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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- 28 4月, 2010 1 次提交
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由 Jiri Olsa 提交于
Add function graph output to irqsoff tracer. The graph output is enabled by setting new 'display-graph' trace option. Signed-off-by: NJiri Olsa <jolsa@redhat.com> LKML-Reference: <1270227683-14631-4-git-send-email-jolsa@redhat.com> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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- 27 4月, 2010 1 次提交
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由 Jiri Olsa 提交于
Let the function graph tracer have custom flags passed to its output functions. Signed-off-by: NJiri Olsa <jolsa@redhat.com> LKML-Reference: <1270227683-14631-3-git-send-email-jolsa@redhat.com> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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- 15 4月, 2010 1 次提交
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由 Masami Hiramatsu 提交于
Support basic types of integer (u8, u16, u32, u64, s8, s16, s32, s64) in kprobe tracer. With this patch, users can specify above basic types on each arguments after ':'. If omitted, the argument type is set as unsigned long (u32 or u64, arch-dependent). e.g. echo 'p account_system_time+0 hardirq_offset=%si:s32' > kprobe_events adds a probe recording hardirq_offset in signed-32bits value on the entry of account_system_time. Cc: Ingo Molnar <mingo@elte.hu> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20100412171708.3790.18599.stgit@localhost6.localdomain6> Signed-off-by: NMasami Hiramatsu <mhiramat@redhat.com> Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
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- 26 3月, 2010 1 次提交
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由 Peter Zijlstra 提交于
Support for the PMU's BTS features has been upstreamed in v2.6.32, but we still have the old and disabled ptrace-BTS, as Linus noticed it not so long ago. It's buggy: TIF_DEBUGCTLMSR is trampling all over that MSR without regard for other uses (perf) and doesn't provide the flexibility needed for perf either. Its users are ptrace-block-step and ptrace-bts, since ptrace-bts was never used and ptrace-block-step can be implemented using a much simpler approach. So axe all 3000 lines of it. That includes the *locked_memory*() APIs in mm/mlock.c as well. Reported-by: NLinus Torvalds <torvalds@linux-foundation.org> Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Roland McGrath <roland@redhat.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Markus Metzger <markus.t.metzger@intel.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Andrew Morton <akpm@linux-foundation.org> LKML-Reference: <20100325135413.938004390@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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- 06 3月, 2010 1 次提交
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由 Tim Bird 提交于
Add support for tracing_thresh to the function_graph tracer. This version of this feature isolates the checks into new entry and return functions, to avoid adding more conditional code into the main function_graph paths. When the tracing_thresh is set and the function graph tracer is enabled, only the functions that took longer than the time in microseconds that was set in tracing_thresh are recorded. To do this efficiently, only the function exits are recorded: [tracing]# echo 100 > tracing_thresh [tracing]# echo function_graph > current_tracer [tracing]# cat trace # tracer: function_graph # # CPU DURATION FUNCTION CALLS # | | | | | | | 1) ! 119.214 us | } /* smp_apic_timer_interrupt */ 1) <========== | 0) ! 101.527 us | } /* __rcu_process_callbacks */ 0) ! 126.461 us | } /* rcu_process_callbacks */ 0) ! 145.111 us | } /* __do_softirq */ 0) ! 149.667 us | } /* do_softirq */ 0) ! 168.817 us | } /* irq_exit */ 0) ! 248.254 us | } /* smp_apic_timer_interrupt */ Also, add support for specifying tracing_thresh on the kernel command line. When used like so: "tracing_thresh=200 ftrace=function_graph" this can be used to analyse system startup. It is important to disable tracing soon after boot, in order to avoid losing the trace data. Acked-by: NFrederic Weisbecker <fweisbec@gmail.com> Signed-off-by: NTim Bird <tim.bird@am.sony.com> LKML-Reference: <4B87098B.4040308@am.sony.com> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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- 25 2月, 2010 1 次提交
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由 Jeff Mahoney 提交于
GCC 4.5 introduces behavior that forces the alignment of structures to use the largest possible value. The default value is 32 bytes, so if some structures are defined with a 4-byte alignment and others aren't declared with an alignment constraint at all - it will align at 32-bytes. For things like the ftrace events, this results in a non-standard array. When initializing the ftrace subsystem, we traverse the _ftrace_events section and call the initialization callback for each event. When the structures are misaligned, we could be treating another part of the structure (or the zeroed out space between them) as a function pointer. This patch forces the alignment for all the ftrace_event_call structures to 4 bytes. Without this patch, the kernel fails to boot very early when built with gcc 4.5. It's trivial to check the alignment of the members of the array, so it might be worthwhile to add something to the build system to do that automatically. Unfortunately, that only covers this case. I've asked one of the gcc developers about adding a warning when this condition is seen. Cc: stable@kernel.org Signed-off-by: NJeff Mahoney <jeffm@suse.com> LKML-Reference: <4B85770B.6010901@suse.com> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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- 12 2月, 2010 1 次提交
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由 Li Zefan 提交于
I don't see why we can only clear all functions from the filter. After patching: # echo sys_open > set_graph_function # echo sys_close >> set_graph_function # cat set_graph_function sys_open sys_close # echo '!sys_close' >> set_graph_function # cat set_graph_function sys_open Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com> LKML-Reference: <4B726388.2000408@cn.fujitsu.com> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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- 05 2月, 2010 1 次提交
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由 Daniel Mack 提交于
Some misspelled occurences of 'octet' and some comments were also fixed as I was on it. Signed-off-by: NDaniel Mack <daniel@caiaq.de> Cc: Jiri Kosina <trivial@kernel.org> Cc: Joe Perches <joe@perches.com> Cc: Junio C Hamano <gitster@pobox.com> Signed-off-by: NJiri Kosina <jkosina@suse.cz>
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- 29 1月, 2010 1 次提交
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由 Lai Jiangshan 提交于
In the function graph tracer, a calling function is to be traced only when it is enabled through the set_graph_function file, or when it is nested in an enabled function. Current code uses TSK_TRACE_FL_GRAPH to test whether it is nested or not. Looking at the code, we can get this: (trace->depth > 0) <==> (TSK_TRACE_FL_GRAPH is set) trace->depth is more explicit to tell that it is nested. So we use trace->depth directly and simplify the code. No functionality is changed. TSK_TRACE_FL_GRAPH is not removed yet, it is left for future usage. Signed-off-by: NLai Jiangshan <laijs@cn.fujitsu.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <4B4DB0B6.7040607@cn.fujitsu.com> Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
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- 14 12月, 2009 1 次提交
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由 Li Zefan 提交于
Since commit 4d9493c9 ("ftrace: remove add-hoc code"), option "sched-tree" has become useless. Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com> Acked-by: NSteven Rostedt <rostedt@goodmis.org> LKML-Reference: <4B1DC50A.7040402@cn.fujitsu.com> Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
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- 08 12月, 2009 1 次提交
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由 Steven Rostedt 提交于
An ftrace plugin can add a pipe_open interface when the user opens trace_pipe. But if the plugin allocates something within the pipe_open it can not free it because there exists no pipe_close. The hook to the trace file open has a corresponding close. The closing of the trace_pipe file should also have a corresponding close. Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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- 25 11月, 2009 1 次提交
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由 Tom Zanussi 提交于
Commit ee949a86 ("tracing/syscalls: Use long for syscall ret format and field definitions") changed the syscall exit return type to long, but forgot to change it in the struct. Signed-off-by: NTom Zanussi <tzanussi@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <1259133299-23594-3-git-send-email-tzanussi@gmail.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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- 08 11月, 2009 2 次提交
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由 Li Zefan 提交于
The macro used to be used in both trace_selftest.c and trace_ksym.c, but no longer, so remove it from header file. Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com> Cc: Prasad <prasad@linux.vnet.ibm.com> Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
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由 Frederic Weisbecker 提交于
This patch rebase the implementation of the breakpoints API on top of perf events instances. Each breakpoints are now perf events that handle the register scheduling, thread/cpu attachment, etc.. The new layering is now made as follows: ptrace kgdb ftrace perf syscall \ | / / \ | / / / Core breakpoint API / / | / | / Breakpoints perf events | | Breakpoints PMU ---- Debug Register constraints handling (Part of core breakpoint API) | | Hardware debug registers Reasons of this rewrite: - Use the centralized/optimized pmu registers scheduling, implying an easier arch integration - More powerful register handling: perf attributes (pinned/flexible events, exclusive/non-exclusive, tunable period, etc...) Impact: - New perf ABI: the hardware breakpoints counters - Ptrace breakpoints setting remains tricky and still needs some per thread breakpoints references. Todo (in the order): - Support breakpoints perf counter events for perf tools (ie: implement perf_bpcounter_event()) - Support from perf tools Changes in v2: - Follow the perf "event " rename - The ptrace regression have been fixed (ptrace breakpoint perf events weren't released when a task ended) - Drop the struct hw_breakpoint and store generic fields in perf_event_attr. - Separate core and arch specific headers, drop asm-generic/hw_breakpoint.h and create linux/hw_breakpoint.h - Use new generic len/type for breakpoint - Handle off case: when breakpoints api is not supported by an arch Changes in v3: - Fix broken CONFIG_KVM, we need to propagate the breakpoint api changes to kvm when we exit the guest and restore the bp registers to the host. Changes in v4: - Drop the hw_breakpoint_restore() stub as it is only used by KVM - EXPORT_SYMBOL_GPL hw_breakpoint_restore() as KVM can be built as a module - Restore the breakpoints unconditionally on kvm guest exit: TIF_DEBUG_THREAD doesn't anymore cover every cases of running breakpoints and vcpu->arch.switch_db_regs might not always be set when the guest used debug registers. (Waiting for a reliable optimization) Changes in v5: - Split-up the asm-generic/hw-breakpoint.h moving to linux/hw_breakpoint.h into a separate patch - Optimize the breakpoints restoring while switching from kvm guest to host. We only want to restore the state if we have active breakpoints to the host, otherwise we don't care about messed-up address registers. - Add asm/hw_breakpoint.h to Kbuild - Fix bad breakpoint type in trace_selftest.c Changes in v6: - Fix wrong header inclusion in trace.h (triggered a build error with CONFIG_FTRACE_SELFTEST Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com> Cc: Prasad <prasad@linux.vnet.ibm.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Jan Kiszka <jan.kiszka@web.de> Cc: Jiri Slaby <jirislaby@gmail.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Avi Kivity <avi@redhat.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Masami Hiramatsu <mhiramat@redhat.com> Cc: Paul Mundt <lethal@linux-sh.org>
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- 15 10月, 2009 3 次提交
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由 Li Zefan 提交于
- Add an ioctl to allocate a filter for a perf event. - Free the filter when the associated perf event is to be freed. - Do the filtering in perf_swevent_match(). Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com> Acked-by: NPeter Zijlstra <peterz@infradead.org> Acked-by: NFrederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <4AD69546.8050401@cn.fujitsu.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Li Zefan 提交于
"==" will always do a full match, and "~" will do a glob match. In the future, we may add "=~" for regex match. Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com> Acked-by: NPeter Zijlstra <peterz@infradead.org> Acked-by: NFrederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <4AD69528.3050309@cn.fujitsu.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Li Zefan 提交于
Change: for_each_pred for_each_subsystem To: for_each_subsystem for_each_pred This change also prepares for later patches. Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com> Acked-by: NPeter Zijlstra <peterz@infradead.org> Acked-by: NFrederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <4AD69502.8060903@cn.fujitsu.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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- 14 10月, 2009 1 次提交
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由 jolsa@redhat.com 提交于
Adding the possibility to set more than 1 pid in the set_pid_ftrace file, thus allowing to trace more than 1 independent processes. Usage: sh-4.0# echo 284 > ./set_ftrace_pid sh-4.0# cat ./set_ftrace_pid 284 sh-4.0# echo 1 >> ./set_ftrace_pid sh-4.0# echo 0 >> ./set_ftrace_pid sh-4.0# cat ./set_ftrace_pid swapper tasks 1 284 sh-4.0# echo 4 > ./set_ftrace_pid sh-4.0# cat ./set_ftrace_pid 4 sh-4.0# echo > ./set_ftrace_pid sh-4.0# cat ./set_ftrace_pid no pid sh-4.0# Signed-off-by: NJiri Olsa <jolsa@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20091013203425.565454612@goodmis.org> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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- 13 10月, 2009 1 次提交
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由 Frederic Weisbecker 提交于
Remove the ftrace_trace_addr() function as only its off-case is implemented and there are no users of it currently. But we keep ftrace_graph_addr() off-case, in case someone come to use the function graph tracer to profit from top-level callers filtering. Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Li Zefan <lizf@cn.fujitsu.com>
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- 12 10月, 2009 1 次提交
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由 Christoph Lameter 提交于
this_cpu_xx can reduce the instruction count here and also avoid address arithmetic. Signed-off-by: NChristoph Lameter <cl@linux-foundation.org> Acked-by: NIngo Molnar <mingo@elte.hu> Signed-off-by: NTejun Heo <tj@kernel.org>
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- 25 9月, 2009 2 次提交
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由 Frederic Weisbecker 提交于
The filter code has stolen the regex parsing function from ftrace to get the regex support. We have duplicated this code, so factorize it in the filter area and make it generally available, as the filter code is the most suited to host this feature. Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Tom Zanussi <tzanussi@gmail.com> Cc: Li Zefan <lizf@cn.fujitsu.com>
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由 Frederic Weisbecker 提交于
This patch provides basic support for regular expressions in filters. It supports the following types of regexp: - *match_beginning - *match_middle* - match_end* - !don't match Example: cd /debug/tracing/events/bkl/lock_kernel echo 'file == "*reiserfs*"' > filter echo 1 > enable gedit-4941 [000] 457.735437: lock_kernel: depth: 0, fs/reiserfs/namei.c:334 reiserfs_lookup() sync_supers-227 [001] 461.379985: lock_kernel: depth: 0, fs/reiserfs/super.c:69 reiserfs_sync_fs() sync_supers-227 [000] 461.383096: lock_kernel: depth: 0, fs/reiserfs/journal.c:1069 flush_commit_list() reiserfs/1-1369 [001] 461.479885: lock_kernel: depth: 0, fs/reiserfs/journal.c:3509 flush_async_commits() Every string is now handled as a regexp in the filter framework, which helps to factorize the code for handling both simple strings and regexp comparisons. (The regexp parsing code has been wildly cherry picked from ftrace.c written by Steve.) v2: Simplify the whole and drop the filter_regex file Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Tom Zanussi <tzanussi@gmail.com> Cc: Li Zefan <lizf@cn.fujitsu.com>
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- 19 9月, 2009 1 次提交
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由 Arjan van de Ven 提交于
This patch converts the existing power tracer into an event tracer, so that power events (C states and frequency changes) can be tracked via "perf". This also removes the perl script that was used to demo the tracer; its functionality is being replaced entirely with timechart. Signed-off-by: NArjan van de Ven <arjan@linux.intel.com> Acked-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20090912130542.6d314860@infradead.org> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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- 13 9月, 2009 4 次提交
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由 Steven Rostedt 提交于
This patch changes the way the format files in debugfs/tracing/events/ftrace/*/format are created. It uses the new trace_entries.h file to automate the creation of the format files to ensure that they are always in sync with the actual structures. This is the same methodology used to create the format files for the TRACE_EVENT macro. This also updates the filter creation that was built on the creation of the format files. Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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由 Steven Rostedt 提交于
Some of the internal ftrace structures use structures within. The output of a field saying it is just a structure is useless for a format file. A binary reader of the ring buffer needs to know more about how the fields are broken up. This patch adds to the ftrace structure macros new fields to describe the structures inside a structure. Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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由 Steven Rostedt 提交于
The entries used by ftrace internal code (plugins) currently have their formats manually exported to userspace. That is, the format files in debugfs/tracing/events/ftrace/*/format are currently created by hand. This is a maintenance nightmare, and can easily become out of sync with what is actually shown. This patch uses the methodology of the TRACE_EVENT macros to build the structures so that their formats can be automated and this will keep the structures in sync with what users can see. This patch only changes the way the structures are created. Further patches will build off of this to automate the format files. Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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由 Carsten Emde 提交于
The state of the function pair tracing_stop()/tracing_start() is correctly considered when tracer data are updated. However, the global and externally accessible variable tracing_max_latency is always updated - even when tracing is stopped. The update should only occur, if tracing was not stopped. Signed-off-by: NCarsten Emde <C.Emde@osadl.org> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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- 12 9月, 2009 1 次提交
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由 jolsa@redhat.com 提交于
Create a "trace_parser" that can parse the user space input for separate words. struct trace_parser is the descriptor. Generic "trace_get_user" function that can be a helper to read multiple words passed in by user space. Signed-off-by: NJiri Olsa <jolsa@redhat.com> LKML-Reference: <1252682969-3366-2-git-send-email-jolsa@redhat.com> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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- 11 9月, 2009 1 次提交
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由 Steven Rostedt 提交于
The userstack trace required the recording of the tgid entry. Unfortunately, it was added to the generic entry where it wasted 4 bytes of every entry and was only used by one entry. This patch moves it out of the generic field and moves it into the only user (userstack_entry). Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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- 10 9月, 2009 4 次提交
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由 Li Zefan 提交于
Move DEFINE_COMPARISON_PRED() and DEFINE_EQUALITY_PRED() to kernel/trace/trace_events_filter.c Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com> LKML-Reference: <4AA8579B.4020706@cn.fujitsu.com> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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由 Li Zefan 提交于
Remove unused field @stats from struct tracer. Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com> LKML-Reference: <4AA8579B.4020706@cn.fujitsu.com> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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由 Li Zefan 提交于
Fix white-space formatting. Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com> LKML-Reference: <4AA8579B.4020706@cn.fujitsu.com> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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由 Li Zefan 提交于
Removes unreachable code. Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com> LKML-Reference: <4AA8579B.4020706@cn.fujitsu.com> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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- 05 9月, 2009 3 次提交
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由 Steven Rostedt 提交于
This patch adds a trace_array_printk to allow a tracer to use the trace_printk on its own trace array. Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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由 Steven Rostedt 提交于
The latency tracers (irqsoff and wakeup) can swap trace buffers on the fly. If an event is happening and has reserved data on one of the buffers, and the latency tracer swaps the global buffer with the max buffer, the result is that the event may commit the data to the wrong buffer. This patch changes the API to the trace recording to be recieve the buffer that was used to reserve a commit. Then this buffer can be passed in to the commit. Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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由 Steven Rostedt 提交于
Currently the latency tracers reset the ring buffer. Unfortunately if a commit is in process (due to a trace event), this can corrupt the ring buffer. When this happens, the ring buffer will detect the corruption and then permanently disable the ring buffer. The bug does not crash the system, but it does prevent further tracing after the bug is hit. Instead of reseting the trace buffers, the timestamp of the start of the trace is used instead. The buffers will still contain the previous data, but the output will not count any data that is before the timestamp of the trace. Note, this only affects the static trace output (trace) and not the runtime trace output (trace_pipe). The runtime trace output does not make sense for the latency tracers anyway. Reported-by: NArnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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