Messages in this thread | | | Date | Fri, 5 Feb 2016 10:57:17 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [PATCH v8 2/4] perf inject: add jitdump mmap injection support |
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Em Fri, Feb 05, 2016 at 10:51:18AM -0300, Arnaldo Carvalho de Melo escreveu: > Em Fri, Feb 05, 2016 at 10:47:31AM -0300, Arnaldo Carvalho de Melo escreveu: > > Em Thu, Feb 04, 2016 at 03:02:59PM -0800, Stephane Eranian escreveu: > > > > I'm keeping what I have a perf/jit branch in my git tree. > > > > What am I doing wrong? Continuing to investigate... > > #7 0x00007fef53f31b3a in strlen () from /lib64/libc.so.6 > > #8 0x00007fef51e8e4c1 in compiled_method_load_cb (jvmti=0x7fef4c003ef0, method=<optimized out>, code_size=520, code_addr=0x7fef3d0ffd00, map_length=<optimized out>, > > map=0x0, compile_info=0x7fef04019e80) at libjvmti.c:85 > > > Ok, this bandaid cured the segfault: > > > ------------------------------------------------------------- > diff --git a/tools/perf/jvmti/libjvmti.c b/tools/perf/jvmti/libjvmti.c > index 745f20c7b4bd..92ffbe4ff160 100644 > --- a/tools/perf/jvmti/libjvmti.c > +++ b/tools/perf/jvmti/libjvmti.c > @@ -82,7 +82,7 @@ compiled_method_load_cb(jvmtiEnv *jvmti, > * append file name, we use loops and not string ops to avoid modifying > * class_sign which is used later for the symbol name > */ > - for (j = 0; i < (PATH_MAX - 1) && j < strlen(file_name); j++, i++) > + for (j = 0; i < (PATH_MAX - 1) && file_name && j < strlen(file_name); j++, i++) > fn[i] = file_name[j]; > fn[i] = '\0'; > } else { > ------------------------------------------------------------- > > Now: > > [acme@jouet java]$ java -agentpath:/home/acme/git/linux/tools/perf/jvmti/libjvmti.so hello.java > java: jvmti: jitdump in /home/acme/.debug/jit/java-jit-20160205.XXdDr2Wr/jit-28322.dump > Error: Could not find or load main class hello.java > [acme@jouet java]$ > > Do I need to set CLASSPATH or something? /me tries...
Duh:
[acme@jouet java]$ java -agentpath:/home/acme/git/linux/tools/perf/jvmti/libjvmti.so hello java: jvmti: jitdump in /home/acme/.debug/jit/java-jit-20160205.XXFb472a/jit-28966.dump Hello, World [acme@jouet java]$
- Arnaldo
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