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2010-01-14ftrace: Fix MATCH_END_ONLY function filterLi Zefan1-3/+3
For '*foo' pattern, we should allow any string ending with 'foo', but ftrace filter incorrectly disallows strings like bar_foo_foo: # echo '*io' > set_ftrace_filter # cat set_ftrace_filter | grep 'req_bio_endio' # cat available_filter_functions | grep 'req_bio_endio' req_bio_endio Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> LKML-Reference: <4B4E870E.6060607@cn.fujitsu.com> Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2009-12-13function-graph: Allow writing the same val to set_graph_functionLi Zefan1-3/+2
# echo 'do_open' > set_graph_function # echo 'do_open' >> set_graph_function bash: echo: write error: Invalid argument Make it valid to write the same value to set_graph_function, which is consistent with set_ftrace_filter interface. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> LKML-reference: <4B1DC4E1.1060303@cn.fujitsu.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
2009-12-13ftrace: Call trace_parser_clear() properlyLi Zefan1-2/+1
I found a weird behavior: # echo 'fuse:*' > set_ftrace_filter bash: echo: write error: Invalid argument # cat set_ftrace_filter fuse_dev_fasync fuse_dev_poll fuse_copy_do We should call trace_parser_clear() no matter ftrace_process_regex() returns 0 or -errno, otherwise we will actually take the unaccepted records from ftrace_regex_release(). Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <4B1DC4D2.3000406@cn.fujitsu.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
2009-12-13ftrace: Return EINVAL when writing invalid val to set_ftrace_filterLi Zefan1-6/+16
Currently it doesn't warn user on invald value: # echo nonexist_symbol > set_ftrace_filter or: # echo 'nonexist_symbol:mod:fuse' > set_ftrace_filter Better make it return failure. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <4B1DC4BF.2070003@cn.fujitsu.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
2009-12-05Merge branch 'tracing-core-for-linus' of ↵Linus Torvalds1-139/+236
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'tracing-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (40 commits) tracing: Separate raw syscall from syscall tracer ring-buffer-benchmark: Add parameters to set produce/consumer priorities tracing, function tracer: Clean up strstrip() usage ring-buffer benchmark: Run producer/consumer threads at nice +19 tracing: Remove the stale include/trace/power.h tracing: Only print objcopy version warning once from recordmcount tracing: Prevent build warning: 'ftrace_graph_buf' defined but not used ring-buffer: Move access to commit_page up into function used tracing: do not disable interrupts for trace_clock_local ring-buffer: Add multiple iterations between benchmark timestamps kprobes: Sanitize struct kretprobe_instance allocations tracing: Fix to use __always_unused attribute compiler: Introduce __always_unused tracing: Exit with error if a weak function is used in recordmcount.pl tracing: Move conditional into update_funcs() in recordmcount.pl tracing: Add regex for weak functions in recordmcount.pl tracing: Move mcount section search to front of loop in recordmcount.pl tracing: Fix objcopy revision check in recordmcount.pl tracing: Check absolute path of input file in recordmcount.pl tracing: Correct the check for number of arguments in recordmcount.pl ...
2009-11-23tracing, function tracer: Clean up strstrip() usageIngo Molnar1-5/+4
Clean up strstrip() usage - which also addresses this build warning: kernel/trace/ftrace.c: In function 'ftrace_pid_write': kernel/trace/ftrace.c:3004: warning: ignoring return value of 'strstrip', declared with attribute warn_unused_result Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> 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> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-11-17tracing: Prevent build warning: 'ftrace_graph_buf' defined but not usedLai Jiangshan1-1/+1
Prevent build warning when CONFIG_FUNCTION_GRAPH_TRACER is not set. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> LKML-Reference: <4AF24381.5060307@cn.fujitsu.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2009-11-04ftrace: Fix unmatched locking in ftrace_regex_write()Li Zefan1-3/+3
When a command is passed to the set_ftrace_filter, then the ftrace_regex_lock is still held going back to user space. # echo 'do_open : foo' > set_ftrace_filter (still holding ftrace_regex_lock when returning to user space!) Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> LKML-Reference: <4AEF7F8A.3080300@cn.fujitsu.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2009-10-29Merge branch 'tracing/urgent' into tracing/coreIngo Molnar1-1/+1
Merge reason: Pick up fixes and move base from -rc1 to -rc5. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-10-24tracing: Update *ppos instead of filp->f_posJiri Olsa1-1/+1
Instead of directly updating filp->f_pos we should update the *ppos argument. The filp->f_pos gets updated within the file_pos_write() function called from sys_write(). Signed-off-by: Jiri Olsa <jolsa@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20091023233646.399670810@goodmis.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-10-14ftrace: Copy ftrace_graph_filter boot param using strlcpyFrederic Weisbecker1-1/+1
We are using strncpy in the wrong way to copy the ftrace_graph_filter boot param because we pass the buffer size instead of the max string size it can contain (buffer size - 1). The end result might not be NULL terminated as we are abusing the max string size. Lets use strlcpy() instead. Reported-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org>
2009-10-14tracing: Enable records during the module loadJiri Olsa1-8/+30
I was debuging some module using "function" and "function_graph" tracers and noticed, that if you load module after you enabled tracing, the module's hooks will convert only to NOP instructions. The attached patch enables modules' hooks if there's function trace allready on, thus allowing to trace module functions. Signed-off-by: Jiri Olsa <jolsa@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <20091013203425.896285120@goodmis.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-10-14tracing: Support multiple pids in set_pid_ftrace filejolsa@redhat.com1-69/+165
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: Jiri Olsa <jolsa@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20091013203425.565454612@goodmis.org> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-10-13Merge branch 'tracing/core' of ↵Ingo Molnar1-0/+34
git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing into tracing/core
2009-10-13Merge branch 'tracing/urgent' into tracing/coreIngo Molnar1-16/+7
Merge reason: Pick up tracing/filters fix from the urgent queue, we will queue up dependent patches. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-10-12ftrace: add kernel command line graph function filteringStefan Assmann1-0/+34
Add a command line parameter to allow limiting the function graphs that are traced on boot up from the given top-level callers , when ftrace=function_graph is specified. This patch adds the following command line option: ftrace_graph_filter=function-list Where function-list is a comma separated list of functions to filter. [fweisbec@gmail.com: picked the documentation changes from the v2 patch] Signed-off-by: Stefan Assmann <sassmann@redhat.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <4AD2DEB9.2@redhat.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
2009-10-08Merge branch 'tracing-fixes-for-linus' of ↵Linus Torvalds1-16/+7
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: tracing: user local buffer variable for trace branch tracer tracing: fix warning on kernel/trace/trace_branch.c andtrace_hw_branches.c ftrace: check for failure for all conversions tracing: correct module boundaries for ftrace_release tracing: fix transposed numbers of lock_depth and preempt_count trace: Fix missing assignment in trace_ctxwake_* tracing: Use free_percpu instead of kfree tracing: Check total refcount before releasing bufs in profile_enable failure
2009-10-07ftrace: check for failure for all conversionsSteven Rostedt1-8/+3
Due to legacy code from back when the dynamic tracer used a daemon, only core kernel code was checking for failures. This is no longer the case. We must check for failures any time we perform text modifications. Cc: stable@kernel.org Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2009-10-07tracing: correct module boundaries for ftrace_releasejolsa@redhat.com1-8/+4
When the module is about the unload we release its call records. The ftrace_release function was given wrong values representing the module core boundaries, thus not releasing its call records. Plus making ftrace_release function module specific. Signed-off-by: Jiri Olsa <jolsa@redhat.com> LKML-Reference: <1254934835-363-3-git-send-email-jolsa@redhat.com> Cc: stable@kernel.org Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2009-10-01Merge branch 'tracing/urgent' into tracing/coreIngo Molnar1-33/+25
Merge reason: Pick up latest fixes and update to latest upstream. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-10-01tracing: Fix infinite recursion in ftrace_update_pid_func()Matt Fleming1-0/+4
When CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST is enabled __ftrace_trace_function contains the current trace function, not ftrace_trace_function. In ftrace_update_pid_func() we currently incorrectly assign the value of ftrace_trace_function to __ftrace_trace_funcion before returning. Without this patch it is possible to execute an infinite recursion whereby ftrace_test_stop_func() calls __ftrace_trace_function, which was assigned ftrace_test_stop_func() in ftrace_update_pid_func(). Signed-off-by: Matt Fleming <matthew.fleming@imgtec.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <1254152581-18347-1-git-send-email-matt@console-pimps.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-26Merge branch 'tracing-fixes-for-linus' of ↵Linus Torvalds1-10/+13
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: modules, tracing: Remove stale struct marker signature from module_layout() tracing/workqueue: Use %pf in workqueue trace events tracing: Fix a comment and a trivial format issue in tracepoint.h tracing: Fix failure path in ftrace_regex_open() tracing: Fix failure path in ftrace_graph_write() tracing: Check the return value of trace_get_user() tracing: Fix off-by-one in trace_get_user()
2009-09-24tracing/filters: Unify the regex parsing helpersFrederic Weisbecker1-59/+5
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: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Tom Zanussi <tzanussi@gmail.com> Cc: Li Zefan <lizf@cn.fujitsu.com>
2009-09-24sysctl: remove "struct file *" argument of ->proc_handlerAlexey Dobriyan1-2/+2
It's unused. It isn't needed -- read or write flag is already passed and sysctl shouldn't care about the rest. It _was_ used in two places at arch/frv for some reason. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: David Howells <dhowells@redhat.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: "David S. Miller" <davem@davemloft.net> Cc: James Morris <jmorris@namei.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-09-23seq_file: constify seq_operationsJames Morris1-2/+2
Make all seq_operations structs const, to help mitigate against revectoring user-triggerable function pointers. This is derived from the grsecurity patch, although generated from scratch because it's simpler than extracting the changes from there. Signed-off-by: James Morris <jmorris@namei.org> Acked-by: Serge Hallyn <serue@us.ibm.com> Acked-by: Casey Schaufler <casey@schaufler-ca.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-09-22tracing: Fix failure path in ftrace_regex_open()Li Zefan1-1/+3
Don't forget to free trace_parser if seq_open() returned failure. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <4AB86694.4040803@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-22tracing: Fix failure path in ftrace_graph_write()Li Zefan1-4/+6
Don't call trace_parser_put() on uninitialized trace_parser. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <4AB86639.3000003@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-22tracing: Check the return value of trace_get_user()Li Zefan1-5/+4
Return immediately if trace_get_user() returned failure. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <4AB86614.7020803@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-19function-graph: use ftrace_graph_funcs directlyLi Zefan1-19/+4
No need to store ftrace_graph_funcs in file->private. Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> LKML-Reference: <4AB32364.7020602@cn.fujitsu.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2009-09-17tracing: switch function prints from %pf to %psSteven Rostedt1-3/+3
For direct function pointers (like what mcount provides) PowerPC64 requires the use of %ps, otherwise nothing is printed. This patch converts all prints of functions retrieved through mcount to use the %ps format from the %pf. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2009-09-16tracing: Fix minor bugs for __unregister_ftrace_function_probeAtsushi Tsuji1-2/+2
Fix the condition of strcmp for "*". Also fix NULL pointer dereference when glob is NULL. Signed-off-by: Atsushi Tsuji <a-tsuji@bk.jp.nec.com> LKML-Reference: <4AAF6726.5090905@bk.jp.nec.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2009-09-11tracing: trace parser support for function and graphjolsa@redhat.com1-110/+40
Convert the writing to 'set_graph_function', 'set_ftrace_filter' and 'set_ftrace_notrace' to use the generic trace_parser 'trace_get_user' function. Removed FTRACE_ITER_CONT flag, since it's not needed after this change. Minor fix in set_graph_function display - g_show function. Signed-off-by: Jiri Olsa <jolsa@redhat.com> LKML-Reference: <1252682969-3366-4-git-send-email-jolsa@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2009-09-06Merge commit 'v2.6.31-rc9' into tracing/coreIngo Molnar1-6/+11
Merge reason: move from -rc5 to -rc9. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-18tracing: handle broken names in ftrace filterJiri Olsa1-6/+11
If one filter item (for set_ftrace_filter and set_ftrace_notrace) is being setup by more than 1 consecutive writes (FTRACE_ITER_CONT flag), it won't be handled corretly. I used following program to test/verify: [snip] #include <stdio.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <string.h> int main(int argc, char **argv) { int fd, i; char *file = argv[1]; if (-1 == (fd = open(file, O_WRONLY))) { perror("open failed"); return -1; } for(i = 0; i < (argc - 2); i++) { int len = strlen(argv[2+i]); int cnt, off = 0; while(len) { cnt = write(fd, argv[2+i] + off, len); len -= cnt; off += cnt; } } close(fd); return 0; } [snip] before change: sh-4.0# echo > ./set_ftrace_filter sh-4.0# /test ./set_ftrace_filter "sys" "_open " sh-4.0# cat ./set_ftrace_filter #### all functions enabled #### sh-4.0# after change: sh-4.0# echo > ./set_ftrace_notrace sh-4.0# test ./set_ftrace_notrace "sys" "_open " sh-4.0# cat ./set_ftrace_notrace sys_open sh-4.0# Signed-off-by: Jiri Olsa <jolsa@redhat.com> LKML-Reference: <20090811152904.GA26065@jolsa.lab.eng.brq.redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2009-08-17ftrace: Simplify seqfile codeLi Zefan1-13/+2
Use seq_release_private(). Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Li Zefan <lizf@cn.fujitsu.com> LKML-Reference: <4A891AAB.8090701@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-11Merge branch 'linus' into tracing/coreIngo Molnar1-5/+14
Conflicts: kernel/trace/trace_events_filter.c We use the tracing/core version. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-07-23tracing: only truncate ftrace files when O_TRUNC is setSteven Rostedt1-2/+2
The current code will truncate the ftrace files contents if O_APPEND is not set and the file is opened in write mode. This is incorrect. It should only truncate the file if O_TRUNC is set. Otherwise if one of these files is opened by a C program with fopen "r+", it will incorrectly truncate the file. Reported-by: Jiri Olsa <jolsa@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2009-07-23function-graph: Fix seqfile memory leakLi Zefan1-3/+12
Every time we cat set_graph_function, we leak memory allocated by seq_open(). Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> LKML-Reference: <4A67D907.2010500@cn.fujitsu.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2009-07-18tracing: Remove unused fields/variablesjolsa@redhat.com1-3/+0
Signed-off-by: Jiri Olsa <jolsa@redhat.com> Cc: rostedt@goodmis.org LKML-Reference: <1247773468-11594-2-git-send-email-jolsa@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-07-18Merge branch 'linus' into tracing/coreIngo Molnar1-3/+2
Merge reason: tracing/core was on an older, pre-rc1 base. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-07-17tracing/function: Cleanup for function tracerXiao Guangrong1-14/+3
We can directly use %pf input format instead of kallsyms_lookup() and %s input format Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Reviewed-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
2009-07-17tracing/function: Simplify __ftrace_replace_code()Xiao Guangrong1-54/+18
Rewrite the __ftrace_replace_code() function, simplify it, but don't change the code's logic. First, we get the state we want to set, if the record has the same state, then do nothing, otherwise enable/disable it. Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Reviewed-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
2009-07-13tracing/function-profiler: do not free per cpu variable statSteven Rostedt1-3/+2
The per cpu variable stat is freeded if we fail to allocate a name on start up. This was due to stat at first being allocated in the initial design. But since then, it has become a static per cpu variable but the free on error was not removed. Also added __init annotation to the function that this is in. [ Impact: prevent possible memory corruption on low mem at boot up ] Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-06-26tracing: Fix stack tracer sysctl handlingLi Zefan1-2/+2
This made my machine completely frozen: # echo 1 > /proc/sys/kernel/stack_tracer_enabled # echo 2 > /proc/sys/kernel/stack_tracer_enabled The cause is register_ftrace_function() was called twice. Also fix ftrace_enabled sysctl, though seems nothing bad happened as I tested it. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <4A448D17.9010305@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-06-26ftrace: Fix the output of profileLi Zefan1-1/+3
The first entry of the ftrace profile was always skipped when reading trace_stat/functionX. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <4A443D59.4080307@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-06-24ftrace: Fix t_hash_start()Li Zefan1-1/+11
When the output of set_ftrace_filter is larger than PAGE_SIZE, t_hash_start() will be called the 2nd time, and then we start from the head of a hlist, which is wrong and causes some entries to be outputed twice. The worse is, if the hlist is large enough, reading set_ftrace_filter won't stop but in a dead loop. Reviewed-by: Liming Wang <liming.wang@windriver.com> Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <4A41876E.2060407@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-06-24ftrace: Don't manipulate @pos in t_start()Li Zefan1-11/+8
It's rather confusing that in t_start(), in some cases @pos is incremented, and in some cases it's decremented and then incremented. This patch rewrites t_start() in a much more general way. Thus we fix a bug that if ftrace_filtered == 1, functions have tracer hooks won't be printed, because the branch is always unreachable: static void *t_start(...) { ... if (!p) return t_hash_start(m, pos); return p; } Before: # echo 'sys_open' > /mnt/tracing/set_ftrace_filter # echo 'sys_write:traceon:4' >> /mnt/tracing/set_ftrace_filter sys_open After: # echo 'sys_open' > /mnt/tracing/set_ftrace_filter # echo 'sys_write:traceon:4' >> /mnt/tracing/set_ftrace_filter sys_open sys_write:traceon:count=4 Reviewed-by: Liming Wang <liming.wang@windriver.com> Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <4A41874B.4090507@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-06-24ftrace: Don't increment @pos in g_start()Li Zefan1-11/+10
It's wrong to increment @pos in g_start(). It causes some entries lost when reading set_graph_function, if the output of the file is larger than PAGE_SIZE. Reviewed-by: Liming Wang <liming.wang@windriver.com> Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <4A418738.7090401@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-06-20tracing/urgent: warn in case of ftrace_start_up inbalanceFrederic Weisbecker1-0/+7
Prevent from further ftrace_start_up inbalances so that we avoid future nop patching omissions with dynamic ftrace. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org>
2009-06-10Merge branch 'tracing-urgent-for-linus' of ↵Linus Torvalds1-10/+19
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'tracing-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: function-graph: always initialize task ret_stack function-graph: move initialization of new tasks up in fork function-graph: add memory barriers for accessing task's ret_stack function-graph: enable the stack after initialization of other variables function-graph: only allocate init tasks if it was not already done Manually fix trivial conflict in kernel/trace/ftrace.c
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