ia64/xen-unstable

changeset 17121:0d732e2455b3

xentrace: Disable tracing by default on exit
Includes an option to disable this behavior.
Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Feb 26 14:39:11 2008 +0000 (2008-02-26)
parents 803c964e3ede
children 3278024fa4ea
files tools/xentrace/xentrace.c
line diff
     1.1 --- a/tools/xentrace/xentrace.c	Tue Feb 26 14:38:57 2008 +0000
     1.2 +++ b/tools/xentrace/xentrace.c	Tue Feb 26 14:39:11 2008 +0000
     1.3 @@ -55,7 +55,8 @@ typedef struct settings_st {
     1.4      uint32_t cpu_mask;
     1.5      unsigned long tbuf_size;
     1.6      unsigned long disk_rsvd;
     1.7 -    uint8_t discard:1;
     1.8 +    uint8_t discard:1,
     1.9 +        disable_tracing:1;
    1.10  } settings_t;
    1.11  
    1.12  settings_t opts;
    1.13 @@ -158,6 +159,28 @@ void write_buffer(unsigned int cpu, unsi
    1.14      exit(EXIT_FAILURE);
    1.15  }
    1.16  
    1.17 +static void disable_tbufs(void)
    1.18 +{
    1.19 +    int xc_handle = xc_interface_open();
    1.20 +    int ret;
    1.21 +
    1.22 +    if ( xc_handle < 0 ) 
    1.23 +    {
    1.24 +        perror("Couldn't open xc handle to disable tbufs.");
    1.25 +        goto out;
    1.26 +    }
    1.27 +
    1.28 +    ret = xc_tbuf_disable(xc_handle);
    1.29 +
    1.30 +    if ( ret != 0 )
    1.31 +    {
    1.32 +        perror("Couldn't disable trace buffers");
    1.33 +    }
    1.34 +
    1.35 +out:
    1.36 +    xc_interface_close(xc_handle);
    1.37 +}
    1.38 +
    1.39  static void get_tbufs(unsigned long *mfn, unsigned long *size)
    1.40  {
    1.41      int ret;
    1.42 @@ -465,6 +488,9 @@ int monitor_tbufs(int outfd)
    1.43          wait_for_event_or_timeout(opts.poll_sleep);
    1.44      }
    1.45  
    1.46 +    if(opts.disable_tracing)
    1.47 +        disable_tbufs();
    1.48 +
    1.49      /* cleanup */
    1.50      free(meta);
    1.51      free(data);
    1.52 @@ -503,6 +529,11 @@ void usage(void)
    1.53  "                          this argument will be ignored.\n" \
    1.54  "  -D  --discard-buffers   Discard all records currently in the trace\n" \
    1.55  "                          buffers before beginning.\n" \
    1.56 +"  -x  --dont-disable-tracing\n" \
    1.57 +"                          By default, xentrace will disable tracing when\n" \
    1.58 +"                          it exits. Selecting this option will tell it to\n" \
    1.59 +"                          keep tracing on.  Traces will be collected in\n" \
    1.60 +"                          Xen's trace buffers until they become full.\n" \
    1.61  "  -?, --help              Show this message\n" \
    1.62  "  -V, --version           Print program version\n" \
    1.63  "\n" \
    1.64 @@ -573,6 +604,7 @@ void parse_args(int argc, char **argv)
    1.65          { "trace-buf-size", required_argument, 0, 'S' },
    1.66          { "reserve-disk-space", required_argument, 0, 'r' },
    1.67          { "discard-buffers", no_argument,      0, 'D' },
    1.68 +        { "dont-disable-tracing", no_argument, 0, 'x' },
    1.69          { "help",           no_argument,       0, '?' },
    1.70          { "version",        no_argument,       0, 'V' },
    1.71          { 0, 0, 0, 0 }
    1.72 @@ -612,6 +644,10 @@ void parse_args(int argc, char **argv)
    1.73              opts.disk_rsvd = argtol(optarg, 0);
    1.74              break;
    1.75  
    1.76 +        case 'x': /* Don't disable tracing */
    1.77 +            opts.disable_tracing = 0;
    1.78 +            break;
    1.79 +
    1.80          default:
    1.81              usage();
    1.82          }
    1.83 @@ -640,6 +676,7 @@ int main(int argc, char **argv)
    1.84      opts.evt_mask = 0;
    1.85      opts.cpu_mask = 0;
    1.86      opts.disk_rsvd = 0;
    1.87 +    opts.disable_tracing = 1;
    1.88  
    1.89      parse_args(argc, argv);
    1.90