- 04 Sep, 2009 9 commits
-
-
Steven Rostedt authored
When reading the tracer from the trace file, updating the max latency may corrupt the output. This patch disables the tracing of the max latency while reading the trace file. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-
Steven Rostedt authored
During development of the tracer, we would copy information from the live tracer to the max tracer with one memcpy. Since then we added a generic ring buffer and we handle the copies differently now. Unfortunately, we never copied the critical section information, and we lost the output: # => started at: kmem_cache_alloc # => ended at: kmem_cache_alloc This patch adds back the critical start and end copying as well as removes the unused "trace_idx" and "overrun" fields of the trace_array_cpu structure. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-
Steven Rostedt authored
Currently the way RB_WARN_ON works, is to disable either the current CPU buffer or all CPU buffers, depending on whether a ring_buffer or ring_buffer_per_cpu struct was passed into the macro. Most users of the RB_WARN_ON pass in the CPU buffer, so only the one CPU buffer gets disabled but the rest are still active. This may confuse users even though a warning is sent to the console. This patch changes the macro to disable the entire buffer even if the CPU buffer is passed in. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-
Steven Rostedt authored
The latency tracers report the number of items in the trace buffer. This uses the ring buffer data to calculate this. Because discarded events are also counted, the numbers do not match the number of items that are printed. The ring buffer also adds a "padding" item to the end of each buffer page which also gets counted as a discarded item. This patch decrements the counter to the page entries on a discard. This allows us to ignore discarded entries while reading the buffer. Decrementing the counter is still safe since it can only happen while the committing flag is still set. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-
Steven Rostedt authored
The function ring_buffer_event_discard can be used on any item in the ring buffer, even after the item was committed. This function provides no safety nets and is very race prone. An item may be safely removed from the ring buffer before it is committed with the ring_buffer_discard_commit. Since there are currently no users of this function, and because this function is racey and error prone, this patch removes it altogether. Note, removing this function also allows the counters to ignore all discarded events (patches will follow). Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-
Steven Rostedt authored
When the ring buffer uses an iterator (static read mode, not on the fly reading), when it crosses a page boundery, it will skip the first entry on the next page. The reason is that the last entry of a page is usually padding if the page is not full. The padding will not be returned to the user. The problem arises on ring_buffer_read because it also increments the iterator. Because both the read and peek use the same rb_iter_peek, the rb_iter_peak will return the padding but also increment to the next item. This is because the ring_buffer_peek will not incerment it itself. The ring_buffer_read will increment it again and then call rb_iter_peek again to get the next item. But that will be the second item, not the first one on the page. The reason this never showed up before, is because the ftrace utility always calls ring_buffer_peek first and only uses ring_buffer_read to increment to the next item. The ring_buffer_peek will always keep the pointer to a valid item and not padding. This just hid the bug. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-
Steven Rostedt authored
The loops in the ring buffer that use cpu_relax are not dependent on other CPUs. They simply came across some padding in the ring buffer and are skipping over them. It is a normal loop and does not require a cpu_relax. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-
Steven Rostedt authored
If a commit is taking place on a CPU ring buffer, do not allow it to be swapped. Return -EBUSY when this is detected instead. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-
Steven Rostedt authored
The callers of reset must ensure that no commit can be taking place at the time of the reset. If it does then we may corrupt the ring buffer. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-
- 31 Aug, 2009 1 commit
-
-
Li Zefan authored
init_preds() allocates about 5392 bytes of memory (on x86_32) for a TRACE_EVENT. With my config, at system boot total memory occupied is: 5392 * (642 + 15) == 3459KB 642 == cat available_events | wc -l 15 == number of dirs in events/ftrace That's quite a lot, so we'd better defer memory allocation util it's needed, that's when filter is used. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Tom Zanussi <tzanussi@gmail.com> Cc: Masami Hiramatsu <mhiramat@redhat.com> LKML-Reference: <4A9B8EA5.6020700@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-
- 29 Aug, 2009 1 commit
-
-
Ingo Molnar authored
Merge branch 'tip/tracing/core' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace into tracing/core
-
- 28 Aug, 2009 2 commits
-
-
Frederic Weisbecker authored
TRACE_EVENT_FN relays on TRACE_EVENT by reprocessing its parameters into the ftrace events CPP macro. This leads to a double substitution in some cases. For example, a bad consequence is a format always prefixed by "%s, %s\n" for every TRACE_EVENT_FN based events. Eg: cat /debug/tracing/events/syscalls/sys_enter/format [...] print fmt: "%s, %s\n", "\"NR %ld (%lx, %lx, %lx, %lx, %lx, %lx)\"",\ "REC->id, REC->args[0], REC->args[1], REC->args[2], REC->args[3],\ REC->args[4], REC->args[5]" This creates a failure in post-processing tools such as perf trace or trace-cmd. Then drop this double substitution and replace it by a new __cpparg() macro that relays CPP arguments containing commas. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Josh Stone <jistone@redhat.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Steven Rostedt <srostedt@redhat.com> Cc: Jason Baron <jbaron@redhat.com> LKML-Reference: <1251413406-6704-1-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-
Ingo Molnar authored
Merge branch 'tracing/core' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing into tracing/core
-
- 27 Aug, 2009 3 commits
-
-
Steven Rostedt authored
The tracing_max_latency file should only be present when one of the latency tracers ({preempt|irqs}off, wakeup*) are enabled. This patch also removes tracing_thresh when latency tracers are not enabled, as well as compiles out code that is only used for latency tracers. Reported-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-
Steven Rostedt authored
The context switch tracer was made before tracepoints were mature, and the original version used markers. This is no longer true and this patch removes the select. Reported-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-
Frederic Weisbecker authored
The recent commit: tracing/events: fix the include file dependencies fixed a file dependency problem while including more than one trace event header file. This fix undefined TRACE_EVENT after an event header macro preprocessing in order to make tracepoint.h able to correctly declare the tracepoints necessary for the next event header file. But now we also need to undefine TRACE_EVENT_FN at the end of an event header file preprocessing for the same reason. This fixes the following build error: In file included from include/trace/events/napi.h:5, from net/core/net-traces.c:28: include/linux/tracepoint.h:285:1: warning: "TRACE_EVENT_FN" redefined In file included from include/trace/define_trace.h:61, from include/trace/events/skb.h:40, from net/core/net-traces.c:27: include/trace/ftrace.h:50:1: warning: this is the location of the previous definition In file included from include/trace/events/napi.h:5, from net/core/net-traces.c:28: include/linux/tracepoint.h:285:1: warning: "TRACE_EVENT_FN" redefined In file included from include/trace/define_trace.h:61, from include/trace/events/skb.h:40, from net/core/net-traces.c:27: include/trace/ftrace.h:50:1: warning: this is the location of the previous definition Reported-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Masami Hiramatsu <mhiramat@redhat.com> Cc: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Li Zefan <lizf@cn.fujitsu.com> LKML-Reference: <20090827161732.GA7618@nowhere> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-
- 26 Aug, 2009 16 commits
-
-
Jason Baron authored
Remove the FTRACE_SYSCALL_MAX definitions now that we have converted the syscall event tracing code to use NR_syscalls. Signed-off-by: Jason Baron <jbaron@redhat.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Jiaying Zhang <jiayingz@google.com> Cc: Martin Bligh <mbligh@google.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Josh Stone <jistone@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: H. Peter Anwin <hpa@zytor.com> Cc: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> LKML-Reference: <f2240cdc8f0b1ca7617390c8f5ec90ba2bd348cf.1251146513.git.jbaron@redhat.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
-
Jason Baron authored
Convert the syscalls event tracing code to use NR_syscalls, instead of FTRACE_SYSCALL_MAX. NR_syscalls is standard accross most arches, and reduces code confusion/complexity. Signed-off-by: Jason Baron <jbaron@redhat.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Jiaying Zhang <jiayingz@google.com> Cc: Martin Bligh <mbligh@google.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Josh Stone <jistone@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: H. Peter Anwin <hpa@zytor.com> Cc: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> LKML-Reference: <9b4f1a84ecae57cc6599412772efa36f0d2b815b.1251146513.git.jbaron@redhat.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
-
Jason Baron authored
Express the available number of syscalls in a standard way by defining NR_syscalls. The common way to define it is to place its definition in asm/unistd.h However, the number of syscalls is defined using __NR_syscall_max in x86-64 after building a dynamic header file "asm-offsets.h" The source file that generates this header, asm-offsets-64.c includes unistd.h, then if we want to express NR_syscalls from __NR_syscall_max in unistd.h only after generating the dynamic header file, we need a watchguard. If unistd.h is included from asm-offsets-64.c, then we are generating asm-offset.h which defines __NR_syscall_max. At this time, we don't want to (we can't) define NR_syscalls, then we do nothing. Otherwise we define NR_syscalls because we know asm-offsets.h has been generated. Signed-off-by: Jason Baron <jbaron@redhat.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Jiaying Zhang <jiayingz@google.com> Cc: Martin Bligh <mbligh@google.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Josh Stone <jistone@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: H. Peter Anwin <hpa@zytor.com> Cc: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> LKML-Reference: <20090826160910.GB2658@redhat.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
-
Jason Baron authored
Add a NR_syscalls #define for x86. This is used in the syscall events tracing code. Todo: make it dynamic like x86_64. NR_syscalls is the usual name used to determine the number of syscalls supported by the current arch. We want to unify the use of this number across archs that support the syscall tracing. This also prepare to move some of the arch code to core code in the syscall tracing area. Signed-off-by: Jason Baron <jbaron@redhat.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Jiaying Zhang <jiayingz@google.com> Cc: Martin Bligh <mbligh@google.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Josh Stone <jistone@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: H. Peter Anwin <hpa@zytor.com> Cc: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> LKML-Reference: <0f33c0f96d198fccc3ddd9ff7f5334ff5cb42706.1251146513.git.jbaron@redhat.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
-
Hendrik Brueckner authored
Kernel threads don't call syscalls using the sysenter/sysexit path. Instead they directly call the sys_* or do_* functions that implement the syscalls inside the kernel. The current syscall tracepoints only bind the sysenter/sysexit path, then it has no effect to trace the kernel thread calls to syscalls in that path. Setting the TIF_SYSCALL_TRACEPOINT flag is then useless for these. Actually there is only one case when a kernel thread can reach the usual syscall exit tracing path: when we create a kernel thread, the child comes to ret_from_fork and is the fork() return is then traced. But this information alone is useless, then we don't want to set the TIF flags for these threads. Kernel threads have task_struct->mm set to NULL. (Thanks to Heiko for that hint ;-) The idea is then to check the mm field in syscall_regfunc() and set the flag accordingly. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Cc: Jason Baron <jbaron@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Jiaying Zhang <jiayingz@google.com> Cc: Martin Bligh <mbligh@google.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> LKML-Reference: <20090825160237.GG4639@cetus.boeblingen.de.ibm.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
-
Hendrik Brueckner authored
Most arch syscall_get_nr() implementations returns -1 if the syscall number is not valid. Accessing the bit field without a check might result in a kernel oops (at least I saw it on s390 for ftrace selftest). Before this change, this problem did not occur, because the invalid syscall number (-1) caused syscall_nr_to_meta() to return NULL. There are at least two scenarios where syscall_get_nr() can return -1: 1. For example, ptrace stores an invalid syscall number, and thus, tracing code resets it. (see do_syscall_trace_enter in arch/s390/kernel/ptrace.c) 2. The syscall_regfunc() (kernel/tracepoint.c) sets the TIF_SYSCALL_FTRACE (now: TIF_SYSCALL_TRACEPOINT) flag for all threads which include kernel threads. However, the ftrace selftest triggers a kernel oops when testing syscall trace points: - The kernel thread is started as ususal (do_fork()), - tracing code sets TIF_SYSCALL_FTRACE, - the ret_from_fork() function is triggered and starts ftrace_syscall_exit() with an invalid syscall number. To avoid these scenarios, I suggest to check the syscall_nr. For instance, the ftrace selftest fails for s390 (with config option CONFIG_FTRACE_SYSCALLS set) and produces the following kernel oops. Unable to handle kernel pointer dereference at virtual kernel address 2000000000 Oops: 0038 [#1] PREEMPT SMP Modules linked in: CPU: 0 Not tainted 2.6.31-rc6-next-20090819-dirty #18 Process kthreadd (pid: 818, task: 000000003ea207e8, ksp: 000000003e813eb8) Krnl PSW : 0704100180000000 00000000000ea54c (ftrace_syscall_exit+0x58/0xdc) R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:1 PM:0 EA:3 Krnl GPRS: 0000000000000000 00000000000e0000 ffffffffffffffff 20000000008c2650 0000000000000007 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 ffffffffffffffff 000000003e813d78 000000003e813f58 0000000000505ba8 000000003e813e18 000000003e813d78 Krnl Code: 00000000000ea540: e330d0000008 ag %r3,0(%r13) 00000000000ea546: a7480007 lhi %r4,7 00000000000ea54a: 1442 nr %r4,%r2 >00000000000ea54c: e31030000090 llgc %r1,0(%r3) 00000000000ea552: 5410d008 n %r1,8(%r13) 00000000000ea556: 8a104000 sra %r1,0(%r4) 00000000000ea55a: 5410d00c n %r1,12(%r13) 00000000000ea55e: 1211 ltr %r1,%r1 Call Trace: ([<0000000000000000>] 0x0) [<000000000001fa22>] do_syscall_trace_exit+0x132/0x18c [<000000000002d0c4>] sysc_return+0x0/0x8 [<000000000001c738>] kernel_thread_starter+0x0/0xc Last Breaking-Event-Address: [<00000000000ea51e>] ftrace_syscall_exit+0x2a/0xdc Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Jason Baron <jbaron@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Jiaying Zhang <jiayingz@google.com> Cc: Martin Bligh <mbligh@google.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> LKML-Reference: <20090825125027.GE4639@cetus.boeblingen.de.ibm.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
-
Hendrik Brueckner authored
This patch includes s390 arch updates to synchronize with latest core changes in the syscalls tracing area. - tracing: Map syscall name to number (syscall_name_to_nr()) - tracing: Call arch_init_ftrace_syscalls at boot - tracing: add support tracepoint ids (set_syscall_{enter,exit}_id()) Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Cc: Jason Baron <jbaron@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Jiaying Zhang <jiayingz@google.com> Cc: Martin Bligh <mbligh@google.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> LKML-Reference: <20090825123111.GD4639@cetus.boeblingen.de.ibm.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
-
Ingo Molnar authored
Merge branch 'tracing/core' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing into tracing/core Conflicts: include/linux/tracepoint.h Signed-off-by: Ingo Molnar <mingo@elte.hu>
-
Steven Rostedt authored
The commit: commit 5ac35daa Author: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> tracing/events: fix the include file dependencies Moved the TRACE_EVENT out of the ifdef protection of tracepoints.h but uses the define of TRACE_EVENT itself as protection. This patch adds comments to explain why. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-
Xiao Guangrong authored
The TRACE_EVENT depends on the include/linux/tracepoint.h first and include/trace/ftrace.h later, if we include the ftrace.h early, a building error will occur. Both define TRACE_EVENT in trace_a.h and trace_b.h, if we include those in .c file, like this: #define CREATE_TRACE_POINTS include <trace/events/trace_a.h> include <trace/events/trace_b.h> The above will not work, because the TRACE_EVENT was re-defined by the previous .h file. Reported-by: Wei Yongjun <yjwei@cn.fujitsu.com> Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> LKML-Reference: <4A937F5E.3020802@cn.fujitsu.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-
Zhaolei authored
There are many clock sources for the tracing system but we can only enable/disable one at a time with the trace/options file. We can move the setting of clock-source out of options and add a separate file for it: # cat trace_clock [local] global # echo global > trace_clock # cat trace_clock local [global] Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com> LKML-Reference: <4A939D08.6050604@cn.fujitsu.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-
Li Zefan authored
Usually, char * entries are dangerous in traces because the string can be released whereas a pointer to it can still wait to be read from the ring buffer. But sometimes we can assume it's safe, like in case of RO data (eg: __file__ or __line__, used in bkl trace event). If these RO data are in a module and so is the call to the trace event, then it's safe, because the ring buffer will be flushed once this module get unloaded. To allow char * to be treated as a string: TRACE_EVENT(..., TP_STRUCT__entry( __field_ext(const char *, name, FILTER_PTR_STRING) ... ) ... ); The filtering will not dereference "char *" unless the developer explicitly sets FILTER_PTR_STR in __field_ext. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> LKML-Reference: <4A7B9287.90205@cn.fujitsu.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-
Li Zefan authored
Add __field_ext(), so a field can be assigned to a specific filter_type, which matches a corresponding filter function. For example, a later patch will allow this: __field_ext(const char *, str, FILTER_PTR_STR); Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> LKML-Reference: <4A7B9272.60507095@cn.fujitsu.com> [ Fixed a -1 to FILTER_OTHER Forward ported to latest kernel. ] Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-
Li Zefan authored
The type of a field is stored as a string in @type, and here we add @filter_type which is an enum value. This prepares for later patches, so we can specifically assign different @filter_type for the same @type. For example normally a "char *" field is treated as a ptr, but we may want it to be treated as a string when doing filting. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> LKML-Reference: <4A7B925E.9030605@cn.fujitsu.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-
Josh Triplett authored
function_graph traces look like nested function calls, complete with braces denoting the start and end of functions. function-graph-fold.vim teaches vim how to fold these functions, to make it more convenient to browse them. To use, :source function-graph-fold.vim while viewing a function_graph trace, or use "view -S function-graph-fold.vim some-trace" to load it from the command-line together with a trace. You can then use the usual vim fold commands, such as "za", to open and close nested functions. While closed, a fold will show the total time taken for a call, as would normally appear on the line with the closing brace. Folded functions will not include finish_task_switch(), so folding should remain relatively sane even through a context switch. Note that this will almost certainly only work well with a single-CPU trace (e.g. trace-cmd report --cpu 1). It also takes some time to run (a few seconds for a large trace on my laptop). Nevertheless, I found it very handy to get an overview of a trace and then drill down on problematic calls. Signed-off-by: Josh Triplett <josh@joshtriplett.org> LKML-Reference: <20090806145701.GB7661@feather> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-
Steven Rostedt authored
While debugging the scheduler push / pull algorithm, I found it very annoying that the sched wake up events did not show the CPU that the task was waking on. In order to analyze the scheduler, I needed that information. This patch adds recording of the CPU that a task is waking up on. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-
- 25 Aug, 2009 5 commits
-
-
Josh Stone authored
This converts the syscall_enter/exit tracepoints into TRACE_EVENTs, so you can have generic ftrace events that capture all system calls with arguments and return values. These generic events are also renamed to sys_enter/exit, so they're more closely aligned to the specific sys_enter_foo events. Signed-off-by: Josh Stone <jistone@redhat.com> Cc: Jason Baron <jbaron@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Jiaying Zhang <jiayingz@google.com> Cc: Martin Bligh <mbligh@google.com> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> LKML-Reference: <1251150194-1713-5-git-send-email-jistone@redhat.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
-
Josh Stone authored
It's not strictly correct for the tracepoint reg/unreg callbacks to occur when a client is hooking up, because the actual tracepoint may not be present yet. This happens to be fine for syscall, since that's in the core kernel, but it would cause problems for tracepoints defined in a module that hasn't been loaded yet. It also means the reg/unreg has to be EXPORTed for any modules to use the tracepoint (as in SystemTap). This patch removes DECLARE_TRACE_WITH_CALLBACK, and instead introduces DEFINE_TRACE_FN which stores the callbacks in struct tracepoint. The callbacks are used now when the active state of the tracepoint changes in set_tracepoint & disable_tracepoint. This also introduces TRACE_EVENT_FN, so ftrace events can also provide registration callbacks if needed. Signed-off-by: Josh Stone <jistone@redhat.com> Cc: Jason Baron <jbaron@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Jiaying Zhang <jiayingz@google.com> Cc: Martin Bligh <mbligh@google.com> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> LKML-Reference: <1251150194-1713-4-git-send-email-jistone@redhat.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
-
Josh Stone authored
The syscall enter/exit tracepoints are only supported on archs that HAVE_SYSCALL_TRACEPOINTS, so the declarations should be #ifdef'ed. Also, the definition of syscall_regfunc and syscall_unregfunc should depend on this same config, rather than the ftrace-specific one. Signed-off-by: Josh Stone <jistone@redhat.com> Cc: Jason Baron <jbaron@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Jiaying Zhang <jiayingz@google.com> Cc: Martin Bligh <mbligh@google.com> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> LKML-Reference: <1251150194-1713-3-git-send-email-jistone@redhat.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
-
Josh Stone authored
s/HAVE_FTRACE_SYSCALLS/HAVE_SYSCALL_TRACEPOINTS/g s/TIF_SYSCALL_FTRACE/TIF_SYSCALL_TRACEPOINT/g The syscall enter/exit tracing is no longer specific to just ftrace, so they now have names that reflect their tie to tracepoints instead. Signed-off-by: Josh Stone <jistone@redhat.com> Cc: Jason Baron <jbaron@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Jiaying Zhang <jiayingz@google.com> Cc: Martin Bligh <mbligh@google.com> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> LKML-Reference: <1251150194-1713-2-git-send-email-jistone@redhat.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
-
Anirban Sinha authored
Signed-off-by: Anirban Sinha <asinha@zeugmasystems.com> Reviewed-by: Li Zefan <lizf@cn.fujitsu.com> Cc: "Oleg Nesterov" <oleg@tv-sign.ru> LKML-Reference: <DDFD17CC94A9BD49A82147DDF7D545C501EA9047@exchange.ZeugmaSystems.local> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-
- 20 Aug, 2009 1 commit
-
-
Li Zefan authored
Before: # echo 1 > events/syscalls/sys_enter_sync/enable # cat events/syscalls/sys_enter_sync/format ... field:int nr; offset:12; size:4; print fmt: "# sync # cat trace ... sync-8950 [000] 2366.087670: sys_sync( After: # echo 1 > events/syscalls/sys_enter_sync/enable # cat events/syscalls/sys_enter_sync/format ... field:int nr; offset:12; size:4; print fmt: "" # sync # cat trace sync-2134 [001] 136.780735: sys_sync() Reported-by: Masami Hiramatsu <mhiramat@redhat.com> Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Jason Baron <jbaron@redhat.com> Cc: Masami Hiramatsu <mhiramat@redhat.com> LKML-Reference: <4A8D05AF.20103@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-
- 19 Aug, 2009 2 commits
-
-
Li Zefan authored
Add filtering support for syscall events: # echo 'mode == 0666' > events/syscalls/sys_enter_open # echo 'ret == 0' > events/syscalls/sys_exit_open # echo 1 > events/syscalls/sys_enter_open # echo 1 > events/syscalls/sys_exit_open # cat trace ... modprobe-3084 [001] 117.463140: sys_open(filename: 917d3e8, flags: 0, mode: 1b6) modprobe-3084 [001] 117.463176: sys_open -> 0x0 less-3086 [001] 117.510455: sys_open(filename: 9c6bdb8, flags: 8000, mode: 1b6) sendmail-2574 [001] 122.145840: sys_open(filename: b807a365, flags: 0, mode: 1b6) ... Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Jason Baron <jbaron@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <4A8BAFCB.1040006@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-
Li Zefan authored
Extract duplicate code. Also prepare for the later patch. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Jason Baron <jbaron@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <4A8BAFB8.1010304@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-