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atrace: add support for app tracing 

This change adds support for the -a command line argument to atrace.  This
argument sets the comma separated list of application names (i.e.
/proc/self/cmdline values) for which to enable application-level tracing.

Change-Id: I812d57c4cdc581943247229413f09b7e1adc10d0
This commit is contained in:
Jamie Gennis 2013-03-27 15:50:58 -07:00
parent c9a4e2f7dc
commit f7f29c8f9d
1 changed files with 26 additions and 3 deletions
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29
cmds/atrace/atrace.cpp
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@ -42,6 +42,7 @@ using namespace android;
enum { MAX_SYS_FILES = 8 };
const char* k_traceTagsProperty = "debug.atrace.tags.enableflags";
const char* k_traceAppCmdlineProperty = "debug.atrace.app_cmdlines";
typedef enum { OPT, REQ } requiredness ;
@ -118,6 +119,7 @@ static bool g_compress = false;
static bool g_nohup = false;
static int g_initialSleepSecs = 0;
static const char* g_kernelTraceFuncs = NULL;
static const char* g_debugAppCmdLine = "";
/* Global state */
static bool g_traceAborted = false;
@ -365,7 +367,18 @@ static bool setTagsProperty(uint64_t tags)
fprintf(stderr, "error setting trace tags system property\n");
return false;
}
return pokeBinderServices();
return true;
}
// Set the system property that indicates which apps should perform
// application-level tracing.
static bool setAppCmdlineProperty(const char* cmdline)
{
if (property_set(k_traceAppCmdlineProperty, cmdline) < 0) {
fprintf(stderr, "error setting trace app system property\n");
return false;
}
return true;
}
// Disable all /sys/ enable files.
@ -488,6 +501,8 @@ static bool setUpTrace()
}
}
ok &= setTagsProperty(tags);
ok &= setAppCmdlineProperty(g_debugAppCmdLine);
ok &= pokeBinderServices();
// Disable all the sysfs enables. This is done as a separate loop from
// the enables to allow the same enable to exist in multiple categories.
@ -521,8 +536,10 @@ static void cleanUpTrace()
// Disable all tracing that we're able to.
disableKernelTraceEvents();
// Disable all the trace tags.
// Reset the system properties.
setTagsProperty(0);
setAppCmdlineProperty("");
pokeBinderServices();
// Set the options back to their defaults.
setTraceOverwriteEnable(true);
@ -700,6 +717,8 @@ static void showHelp(const char *cmd)
{
fprintf(stderr, "usage: %s [options] [categories...]\n", cmd);
fprintf(stderr, "options include:\n"
" -a appname enable app-level tracing for a comma "
"separated list of cmdlines\n"
" -b N use a trace buffer size of N KB\n"
" -c trace into a circular buffer\n"
" -k fname,... trace the listed kernel functions\n"
@ -739,7 +758,7 @@ int main(int argc, char **argv)
{ 0, 0, 0, 0 }
};
ret = getopt_long(argc, argv, "b:ck:ns:t:z",
ret = getopt_long(argc, argv, "a:b:ck:ns:t:z",
long_options, &option_index);
if (ret < 0) {
@ -753,6 +772,10 @@ int main(int argc, char **argv)
}
switch(ret) {
case 'a':
g_debugAppCmdLine = optarg;
break;
case 'b':
g_traceBufferSizeKB = atoi(optarg);
break;