diff options
Diffstat (limited to 'usr/src/uts/common/os/dtrace_subr.c')
| -rw-r--r-- | usr/src/uts/common/os/dtrace_subr.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/usr/src/uts/common/os/dtrace_subr.c b/usr/src/uts/common/os/dtrace_subr.c index 6c0b7d3369..f2a9ac1b7d 100644 --- a/usr/src/uts/common/os/dtrace_subr.c +++ b/usr/src/uts/common/os/dtrace_subr.c @@ -20,12 +20,10 @@ */ /* - * Copyright 2007 Sun Microsystems, Inc. All rights reserved. + * Copyright 2009 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ -#pragma ident "%Z%%M% %I% %E% SMI" - #include <sys/dtrace.h> #include <sys/cmn_err.h> #include <sys/tnf.h> @@ -45,6 +43,7 @@ void (*dtrace_helpers_cleanup)(void); void (*dtrace_helpers_fork)(proc_t *, proc_t *); void (*dtrace_cpustart_init)(void); void (*dtrace_cpustart_fini)(void); +void (*dtrace_cpc_fire)(uint64_t); void (*dtrace_debugger_init)(void); void (*dtrace_debugger_fini)(void); @@ -52,6 +51,20 @@ void (*dtrace_debugger_fini)(void); dtrace_vtime_state_t dtrace_vtime_active = 0; dtrace_cacheid_t dtrace_predcache_id = DTRACE_CACHEIDNONE + 1; +/* + * dtrace_cpc_in_use usage statement: this global variable is used by the cpc + * hardware overflow interrupt handler and the kernel cpc framework to check + * whether or not the DTrace cpc provider is currently in use. The variable is + * set before counters are enabled with the first enabling and cleared when + * the last enabling is disabled. Its value at any given time indicates the + * number of active dcpc based enablings. The global 'kcpc_cpuctx_lock' rwlock + * is held during initial setting to protect races between kcpc_open() and the + * first enabling. The locking provided by the DTrace subsystem, the kernel + * cpc framework and the cpu management framework protect consumers from race + * conditions on enabling and disabling probes. + */ +uint32_t dtrace_cpc_in_use = 0; + typedef struct dtrace_hrestime { lock_t dthr_lock; /* lock for this element */ timestruc_t dthr_hrestime; /* hrestime value */ |