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xen
23643-xentrace_Allow_tracing_to_be_enabled_at_b...
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File 23643-xentrace_Allow_tracing_to_be_enabled_at_boot.patch of Package xen
changeset: 23643:335e96664589 user: George Dunlap <george.dunlap@eu.citrix.com> date: Fri Jul 01 20:31:18 2011 +0100 files: xen/common/trace.c description: xentrace: Allow tracing to be enabled at boot Add a "tevt_mask" parameter to the xen command-line, allowing trace records to be gathered early in boot. They will be placed into the trace buffers, and read when the user runs "xentrace". Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com> --- xen/common/trace.c | 20 ++++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-) Index: xen-4.1.2-testing/xen/common/trace.c =================================================================== --- xen-4.1.2-testing.orig/xen/common/trace.c +++ xen-4.1.2-testing/xen/common/trace.c @@ -45,7 +45,9 @@ CHECK_t_buf; /* opt_tbuf_size: trace buffer size (in pages) for each cpu */ static unsigned int opt_tbuf_size; +static unsigned int opt_tevt_mask; integer_param("tbuf_size", opt_tbuf_size); +integer_param("tevt_mask", opt_tevt_mask); /* Pointers to the meta-data objects for all system trace buffers */ static struct t_info *t_info; @@ -338,11 +340,21 @@ void __init init_trace_bufs(void) { register_cpu_notifier(&cpu_nfb); - if ( opt_tbuf_size && alloc_trace_bufs(opt_tbuf_size) ) + if ( opt_tbuf_size ) { - printk(XENLOG_INFO "xentrace: allocation size %d failed, disabling\n", - opt_tbuf_size); - opt_tbuf_size = 0; + if ( alloc_trace_bufs(opt_tbuf_size) ) + { + printk("xentrace: allocation size %d failed, disabling\n", + opt_tbuf_size); + opt_tbuf_size = 0; + } + else if ( opt_tevt_mask ) + { + printk("xentrace: Starting tracing, enabling mask %x\n", + opt_tevt_mask); + tb_event_mask = opt_tevt_mask; + tb_init_done=1; + } } }
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