1. 21 8月, 2010 3 次提交
  2. 11 8月, 2010 1 次提交
  3. 05 8月, 2010 1 次提交
  4. 14 5月, 2010 1 次提交
    • S
      tracing: Let tracepoints have data passed to tracepoint callbacks · 38516ab5
      Steven Rostedt 提交于
      This patch adds data to be passed to tracepoint callbacks.
      
      The created functions from DECLARE_TRACE() now need a mandatory data
      parameter. For example:
      
      DECLARE_TRACE(mytracepoint, int value, value)
      
      Will create the register function:
      
      int register_trace_mytracepoint((void(*)(void *data, int value))probe,
                                      void *data);
      
      As the first argument, all callbacks (probes) must take a (void *data)
      parameter. So a callback for the above tracepoint will look like:
      
      void myprobe(void *data, int value)
      {
      }
      
      The callback may choose to ignore the data parameter.
      
      This change allows callbacks to register a private data pointer along
      with the function probe.
      
      	void mycallback(void *data, int value);
      
      	register_trace_mytracepoint(mycallback, mydata);
      
      Then the mycallback() will receive the "mydata" as the first parameter
      before the args.
      
      A more detailed example:
      
        DECLARE_TRACE(mytracepoint, TP_PROTO(int status), TP_ARGS(status));
      
        /* In the C file */
      
        DEFINE_TRACE(mytracepoint, TP_PROTO(int status), TP_ARGS(status));
      
        [...]
      
             trace_mytracepoint(status);
      
        /* In a file registering this tracepoint */
      
        int my_callback(void *data, int status)
        {
      	struct my_struct my_data = data;
      	[...]
        }
      
        [...]
      	my_data = kmalloc(sizeof(*my_data), GFP_KERNEL);
      	init_my_data(my_data);
      	register_trace_mytracepoint(my_callback, my_data);
      
      The same callback can also be registered to the same tracepoint as long
      as the data registered is different. Note, the data must also be used
      to unregister the callback:
      
      	unregister_trace_mytracepoint(my_callback, my_data);
      
      Because of the data parameter, tracepoints declared this way can not have
      no args. That is:
      
        DECLARE_TRACE(mytracepoint, TP_PROTO(void), TP_ARGS());
      
      will cause an error.
      
      If no arguments are needed, a new macro can be used instead:
      
        DECLARE_TRACE_NOARGS(mytracepoint);
      
      Since there are no arguments, the proto and args fields are left out.
      
      This is part of a series to make the tracepoint footprint smaller:
      
         text	   data	    bss	    dec	    hex	filename
      4913961	1088356	 861512	6863829	 68bbd5	vmlinux.orig
      4914025	1088868	 861512	6864405	 68be15	vmlinux.class
      4918492	1084612	 861512	6864616	 68bee8	vmlinux.tracepoint
      
      Again, this patch also increases the size of the kernel, but
      lays the ground work for decreasing it.
      
       v5: Fixed net/core/drop_monitor.c to handle these updates.
      
       v4: Moved the DECLARE_TRACE() DECLARE_TRACE_NOARGS out of the
           #ifdef CONFIG_TRACE_POINTS, since the two are the same in both
           cases. The __DECLARE_TRACE() is what changes.
           Thanks to Frederic Weisbecker for pointing this out.
      
       v3: Made all register_* functions require data to be passed and
           all callbacks to take a void * parameter as its first argument.
           This makes the calling functions comply with C standards.
      
           Also added more comments to the modifications of DECLARE_TRACE().
      
       v2: Made the DECLARE_TRACE() have the ability to pass arguments
           and added a new DECLARE_TRACE_NOARGS() for tracepoints that
           do not need any arguments.
      Acked-by: NMathieu Desnoyers <mathieu.desnoyers@efficios.com>
      Acked-by: NMasami Hiramatsu <mhiramat@redhat.com>
      Acked-by: NFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Neil Horman <nhorman@tuxdriver.com>
      Cc: David S. Miller <davem@davemloft.net>
      Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
      38516ab5
  5. 30 3月, 2010 1 次提交
    • T
      include cleanup: Update gfp.h and slab.h includes to prepare for breaking... · 5a0e3ad6
      Tejun Heo 提交于
      include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
      
      percpu.h is included by sched.h and module.h and thus ends up being
      included when building most .c files.  percpu.h includes slab.h which
      in turn includes gfp.h making everything defined by the two files
      universally available and complicating inclusion dependencies.
      
      percpu.h -> slab.h dependency is about to be removed.  Prepare for
      this change by updating users of gfp and slab facilities include those
      headers directly instead of assuming availability.  As this conversion
      needs to touch large number of source files, the following script is
      used as the basis of conversion.
      
        http://userweb.kernel.org/~tj/misc/slabh-sweep.py
      
      The script does the followings.
      
      * Scan files for gfp and slab usages and update includes such that
        only the necessary includes are there.  ie. if only gfp is used,
        gfp.h, if slab is used, slab.h.
      
      * When the script inserts a new include, it looks at the include
        blocks and try to put the new include such that its order conforms
        to its surrounding.  It's put in the include block which contains
        core kernel includes, in the same order that the rest are ordered -
        alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
        doesn't seem to be any matching order.
      
      * If the script can't find a place to put a new include (mostly
        because the file doesn't have fitting include block), it prints out
        an error message indicating which .h file needs to be added to the
        file.
      
      The conversion was done in the following steps.
      
      1. The initial automatic conversion of all .c files updated slightly
         over 4000 files, deleting around 700 includes and adding ~480 gfp.h
         and ~3000 slab.h inclusions.  The script emitted errors for ~400
         files.
      
      2. Each error was manually checked.  Some didn't need the inclusion,
         some needed manual addition while adding it to implementation .h or
         embedding .c file was more appropriate for others.  This step added
         inclusions to around 150 files.
      
      3. The script was run again and the output was compared to the edits
         from #2 to make sure no file was left behind.
      
      4. Several build tests were done and a couple of problems were fixed.
         e.g. lib/decompress_*.c used malloc/free() wrappers around slab
         APIs requiring slab.h to be added manually.
      
      5. The script was run on all .h files but without automatically
         editing them as sprinkling gfp.h and slab.h inclusions around .h
         files could easily lead to inclusion dependency hell.  Most gfp.h
         inclusion directives were ignored as stuff from gfp.h was usually
         wildly available and often used in preprocessor macros.  Each
         slab.h inclusion directive was examined and added manually as
         necessary.
      
      6. percpu.h was updated not to include slab.h.
      
      7. Build test were done on the following configurations and failures
         were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
         distributed build env didn't work with gcov compiles) and a few
         more options had to be turned off depending on archs to make things
         build (like ipr on powerpc/64 which failed due to missing writeq).
      
         * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
         * powerpc and powerpc64 SMP allmodconfig
         * sparc and sparc64 SMP allmodconfig
         * ia64 SMP allmodconfig
         * s390 SMP allmodconfig
         * alpha SMP allmodconfig
         * um on x86_64 SMP allmodconfig
      
      8. percpu.h modifications were reverted so that it could be applied as
         a separate patch and serve as bisection point.
      
      Given the fact that I had only a couple of failures from tests on step
      6, I'm fairly confident about the coverage of this conversion patch.
      If there is a breakage, it's likely to be something in one of the arch
      headers which should be easily discoverable easily on most builds of
      the specific arch.
      Signed-off-by: NTejun Heo <tj@kernel.org>
      Guess-its-ok-by: NChristoph Lameter <cl@linux-foundation.org>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
      5a0e3ad6
  6. 08 3月, 2010 3 次提交
  7. 27 2月, 2010 1 次提交
    • T
      percpu: Add __percpu sparse annotations to hw_breakpoint · 44ee6358
      Tejun Heo 提交于
      Add __percpu sparse annotations to hw_breakpoint.
      
      These annotations are to make sparse consider percpu variables to be
      in a different address space and warn if accessed without going
      through percpu accessors.  This patch doesn't affect normal builds.
      
      In kernel/hw_breakpoint.c, per_cpu(nr_task_bp_pinned, cpu)'s will
      trigger spurious noderef related warnings from sparse.  Changing it to
      &per_cpu(nr_task_bp_pinned[0], cpu) will work around the problem but
      deemed to ugly by the maintainer.  Leave it alone until better
      solution can be found.
      Signed-off-by: NTejun Heo <tj@kernel.org>
      Cc: Stephen Rothwell <sfr@canb.auug.org.au>
      Cc: K.Prasad <prasad@linux.vnet.ibm.com>
      LKML-Reference: <4B7B4B7A.9050902@kernel.org>
      Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
      44ee6358
  8. 06 12月, 2009 1 次提交
  9. 27 11月, 2009 1 次提交
  10. 26 11月, 2009 1 次提交
  11. 24 11月, 2009 1 次提交
  12. 10 11月, 2009 1 次提交
  13. 09 11月, 2009 1 次提交
  14. 02 10月, 2009 1 次提交
  15. 19 9月, 2009 1 次提交
  16. 16 9月, 2009 1 次提交
  17. 17 8月, 2009 1 次提交
  18. 13 7月, 2009 1 次提交
    • L
      tracing/events: Move TRACE_SYSTEM outside of include guard · d0b6e04a
      Li Zefan 提交于
      If TRACE_INCLDUE_FILE is defined, <trace/events/TRACE_INCLUDE_FILE.h>
      will be included and compiled, otherwise it will be
      <trace/events/TRACE_SYSTEM.h>
      
      So TRACE_SYSTEM should be defined outside of #if proctection,
      just like TRACE_INCLUDE_FILE.
      
      Imaging this scenario:
      
       #include <trace/events/foo.h>
          -> TRACE_SYSTEM == foo
       ...
       #include <trace/events/bar.h>
          -> TRACE_SYSTEM == bar
       ...
       #define CREATE_TRACE_POINTS
       #include <trace/events/foo.h>
          -> TRACE_SYSTEM == bar !!!
      
      and then bar.h will be included and compiled.
      Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      LKML-Reference: <4A5A9CF1.2010007@cn.fujitsu.com>
      Signed-off-by: NIngo Molnar <mingo@elte.hu>
      d0b6e04a
  19. 17 6月, 2009 1 次提交
  20. 16 6月, 2009 2 次提交
  21. 03 6月, 2009 1 次提交
  22. 07 5月, 2009 1 次提交
    • S
      tracing: update sample with TRACE_INCLUDE_FILE · 71e1c8ac
      Steven Rostedt 提交于
      When creating trace events for ftrace, the header file with the TRACE_EVENT
      macros must also have a macro called TRACE_SYSTEM. This macro describes
      the name of the system the TRACE_EVENTS are defined for. It also doubles
      as a way for the define_trace.h file to include the file that included
      it.
      
      For example:
      
      in irq.h
      
       #define TRACE_SYSTEM irq
      
      [...]
      
       #include <trace/define_trace.h>
      
      The define_trace will use TRACE_SYSTEM to include irq.h. But if the name
      of the trace system does not match the name of the trace header file,
      one can override it with:
      
      Which will change define_trace.h to inclued foo_trace.h instead of foo.h
      
      The sample comments this, but people that use the sample code will more
      likely use the code and not read the comments. This patch changes the
      sample code to use the TRACE_INCLUDE_FILE to better show developers how to
      use it.
      
      [ Impact: make sample less confusing to developers ]
      Reported-by: NChristoph Hellwig <hch@lst.de>
      Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
      71e1c8ac
  23. 06 5月, 2009 3 次提交
  24. 15 4月, 2009 1 次提交
  25. 25 3月, 2009 1 次提交
  26. 10 3月, 2009 1 次提交
  27. 07 1月, 2009 1 次提交
  28. 16 11月, 2008 2 次提交
  29. 14 10月, 2008 2 次提交
  30. 22 7月, 2008 2 次提交
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