• Stephane Eranian's avatar
    perf tools: add JVMTI agent library · 209045ad
    Stephane Eranian authored
    This is a standalone JVMTI library to help  profile Java jitted code with perf
    record/perf report. The library is not installed or compiled automatically by
    perf Makefile. It is not used directly by perf. It is arch agnostic and has
    been tested on X86 and ARM. It needs to be used with a Java runtime, such as
    OpenJDK, as follows:
    
      $ java -agentpath:libjvmti.so .......
    
    See the "Committer Notes" below on how to build it.
    
    When used this way, java will generate a jitdump binary file in
    $HOME/.debug/java/jit/java-jit-*
    
    This binary dump file contains information to help symbolize and
    annotate jitted code.
    
    The jitdump information must be injected into the perf.data file
    using:
    
      $ perf inject --jit -i perf.data -o perf.data.jitted
    
    This injects the MMAP records to cover the jitted code and also generates
    one ELF image for each jitted function. The ELF images are created in the
    same subdir as the jitdump file. The MMAP records point there too.
    
    Then, to visualize the function or asm profile, simply use the regular
    perf commands:
    
      $ perf report -i perf.data.jitted
    
    or
    
      $ perf annotate -i perf.data.jitted
    
    JVMTI agent code adapted from the OProfile's opagent code.
    
    This version of the JVMTI agent is using the CLOCK_MONOTONIC as the time
    source to timestamp jit samples. To correlate with perf_events samples,
    it needs to run on kernel 4.0.0-rc5+ or later with the following commit
    from Peter Zijlstra:
    
      34f43927 ("perf: Add per event clockid support")
    
    With this patch recording jitted code is done as follows:
    
       $ perf record -k mono -- java -agentpath:libjvmti.so .......
    
     --------------------------------------------------------------------------
    
    Committer Notes:
    
    Extended testing instructions:
    
      $ cd tools/perf/jvmti/
      $ dnf install java-devel
      $ make
    
    Then, create some simple java stuff to record some samples:
    
      $ cat hello.java
      public class hello {
    	public static void main(String[] args) {
                     System.out.println("Hello, World");
           	}
      }
      $ javac hello.java
      $ java hello
      Hello, World
      $
    
    And then record it using this jvmti thing:
    
      $ perf record -k mono java -agentpath:/home/acme/git/linux/tools/perf/jvmti/libjvmti.so hello
      java: jvmti: jitdump in /home/acme/.debug/jit/java-jit-20160205.XXWIEDls/jit-1908.dump
      Hello, World
      [ perf record: Woken up 1 times to write data ]
      [ perf record: Captured and wrote 0.030 MB perf.data (268 samples) ]
      $
    
    Now lets insert the PERF_RECORD_MMAP2 records to point jitted mmaps to
    files created by the agent:
    
      $ perf inject --jit -i perf.data -o perf.data.jitted
    
    And finally see that it did its job:
    
      $ perf report -D -i perf.data.jitted | grep PERF_RECORD_MMAP2 | tail -5
      79197149129422 0xfe10 [0xa0]: PERF_RECORD_MMAP2 1908/1923: [0x7f172428bd60(0x80) @ 0x40 fd:02 1840554 1]: --xs /home/acme/.debug/jit/java-jit-20160205.XXWIEDls/jitted-1908-283.so
      79197149235701 0xfeb0 [0xa0]: PERF_RECORD_MMAP2 1908/1923: [0x7f172428ba60(0x180) @ 0x40 fd:02 1840555 1]: --xs /home/acme/.debug/jit/java-jit-20160205.XXWIEDls/jitted-1908-284.so
      79197149250558 0xff50 [0xa0]: PERF_RECORD_MMAP2 1908/1923: [0x7f172428b860(0x180) @ 0x40 fd:02 1840556 1]: --xs /home/acme/.debug/jit/java-jit-20160205.XXWIEDls/jitted-1908-285.so
      79197149714746 0xfff0 [0xa0]: PERF_RECORD_MMAP2 1908/1923: [0x7f172428b660(0x180) @ 0x40 fd:02 1840557 1]: --xs /home/acme/.debug/jit/java-jit-20160205.XXWIEDls/jitted-1908-286.so
      79197149806558 0x10090 [0xa0]: PERF_RECORD_MMAP2 1908/1923: [0x7f172428b460(0x180) @ 0x40 fd:02 1840558 1]: --xs /home/acme/.debug/jit/java-jit-20160205.XXWIEDls/jitted-1908-287.so
      $
    
    So:
    
      $ perf report -D -i perf.data | grep PERF_RECORD_MMAP2 | wc -l
      Failed to open /tmp/perf-1908.map, continuing without symbols
      21
      $ perf report -D -i perf.data.jitted | grep PERF_RECORD_MMAP2 | wc -l
      307
      $ echo $((307 - 21))
      286
      $
    
    286 extra PERF_RECORD_MMAP2 records.
    
    All for thise tiny, with just one function, ELF files:
    
      $ file /home/acme/.debug/jit/java-jit-20160205.XXWIEDls/jitted-1908-9.so
      /home/acme/.debug/jit/java-jit-20160205.XXWIEDls/jitted-1908-9.so: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), corrupted program header size, BuildID[sha1]=ae54a2ebc3ecf0ba547bfc8cabdea1519df5203f, not stripped
      $ readelf -sw /home/acme/.debug/jit/java-jit-20160205.XXWIEDls/jitted-1908-9.so
    
      Symbol table '.symtab' contains 2 entries:
       Num:    Value          Size Type    Bind   Vis      Ndx Name
         0: 0000000000000000     0 NOTYPE  LOCAL  DEFAULT  UND
         1: 0000000000000040     9 FUNC    LOCAL  DEFAULT    1 atomic_cmpxchg_long
      $
    
    Inserted into the build-id cache:
    
      $ ls -la ~/.debug/.build-id/ae/54a2ebc3ecf0ba547bfc8cabdea1519df5203f
      lrwxrwxrwx. 1 acme acme 111 Feb  5 11:30 /home/acme/.debug/.build-id/ae/54a2ebc3ecf0ba547bfc8cabdea1519df5203f -> ../../home/acme/.debug/jit/java-jit-20160205.XXWIEDls/jitted-1908-9.so/ae54a2ebc3ecf0ba547bfc8cabdea1519df5203f
    
    Note: check why 'file' reports that 'corrupted program header size'.
    
    With a stupid java hog to do some profiling:
    
    $ cat hog.java
      public class hog {
    	private static double do_something_else(int i) {
    		double total = 0;
    		while (i > 0) {
    			total += Math.log(i--);
    		}
    		return total;
    	}
    	private static double do_something(int i) {
    		double total = 0;
    		while (i > 0) {
    			total += Math.sqrt(i--) + do_something_else(i / 100);
    		}
    		return total;
    	}
    	public static void main(String[] args) {
    		System.out.println(String.format("%s=%f & %f", args[0],
    				   do_something(Integer.parseInt(args[0])),
    				   do_something_else(Integer.parseInt(args[1]))));
    	}
      }
      $ javac hog.java
      $ perf record -F 10000 -g -k mono java -agentpath:/home/acme/git/linux/tools/perf/jvmti/libjvmti.so hog 100000 2345000
      java: jvmti: jitdump in /home/acme/.debug/jit/java-jit-20160205.XX4sqd14/jit-8670.dump
      100000=291561592.669602 & 32050989.778714
      [ perf record: Woken up 6 times to write data ]
      [ perf record: Captured and wrote 1.536 MB perf.data (12538 samples) ]
      $ perf inject --jit -i perf.data -o perf.data.jitted
    
    Looking at the 'perf report' TUI, at one expanded callchain leading
    to the jitted code:
    
      $ perf report --no-children -i perf.data.jitted
    
    Samples: 12K of event 'cycles:pp', Event count (approx.): 3829569932
      Overhead  Comm  Shared Object       Symbol
    -   93.38%  java  jitted-8670-291.so  [.] class hog.do_something_else(int)
         class hog.do_something_else(int)
       - Interpreter
          - 75.86% call_stub
               JavaCalls::call_helper
               jni_invoke_static
               jni_CallStaticVoidMethod
               JavaMain
               start_thread
          - 17.52% JavaCalls::call_helper
               jni_invoke_static
               jni_CallStaticVoidMethod
               JavaMain
               start_thread
    Signed-off-by: default avatarStephane Eranian <eranian@google.com>
    Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Adrian Hunter <adrian.hunter@intel.com>
    Cc: Andi Kleen <ak@linux.intel.com>
    Cc: Carl Love <cel@us.ibm.com>
    Cc: David Ahern <dsahern@gmail.com>
    Cc: Jiri Olsa <jolsa@redhat.com>
    Cc: John McCutchan <johnmccutchan@google.com>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Pawel Moll <pawel.moll@arm.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Sonny Rao <sonnyrao@chromium.org>
    Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
    Link: http://lkml.kernel.org/r/1448874143-7269-4-git-send-email-eranian@google.com
    [ Made it build on fedora23, added some build/usage instructions ]
    [ Check if filename != NULL in compiled_method_load_cb, fixing segfault ]
    Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    209045ad
jvmti_agent.h 647 Bytes