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commit 861ff65d099c2b958321ca659786c7eb8a9a1130
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Author: William Cohen <wcohen@redhat.com>
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Date: Wed Nov 15 23:47:16 2017 -0500
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Avoid statically limiting the number of lmsensor events allowed
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Some high-end server machines provide more events than the 512 entries
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limit imposed by the LM_SENSORS_MAX_COUNTERS define in the lmsensor
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component (observed 577 entries on one machine). When this limit was
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exceeded the lmsensor component would write beyond the array bounds
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causing ctests/all_native_events to crash. Modified the lmsensor code
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to dynamically allocate the required space for all the available
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lmsensor entries on the machine. This allows ctests/all_native_events
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to run to completion.
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diff --git a/src/components/lmsensors/linux-lmsensors.c b/src/components/lmsensors/linux-lmsensors.c
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index c9d8530d..07be89fd 100644
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--- a/src/components/lmsensors/linux-lmsensors.c
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+++ b/src/components/lmsensors/linux-lmsensors.c
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@@ -43,8 +43,6 @@
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/************************* DEFINES SECTION ***********************************
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*******************************************************************************/
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-/* this number assumes that there will never be more events than indicated */
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-#define LM_SENSORS_MAX_COUNTERS 512
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// time in usecs
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#define LM_SENSORS_REFRESHTIME 200000
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@@ -82,7 +80,6 @@ typedef struct _lmsensors_reg_alloc
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typedef struct _lmsensors_control_state
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{
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- long_long counts[LM_SENSORS_MAX_COUNTERS]; // used for caching
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long_long lastupdate;
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} _lmsensors_control_state_t;
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@@ -100,6 +97,7 @@ typedef struct _lmsensors_context
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static _lmsensors_native_event_entry_t *lm_sensors_native_table;
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/* number of events in the table*/
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static int num_events = 0;
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+long_long *cached_counts = NULL; // used for caching readings
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@@ -304,6 +302,9 @@ _lmsensors_init_component( int cidx )
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num_events = detectSensors( );
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SUBDBG("Found %d sensors\n",num_events);
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+ _lmsensors_vector.cmp_info.num_mpx_cntrs = num_events;
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+ _lmsensors_vector.cmp_info.num_cntrs = num_events;
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+
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if ( ( lm_sensors_native_table =
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calloc( num_events, sizeof ( _lmsensors_native_event_entry_t )))
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== NULL ) {
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@@ -312,6 +313,14 @@ _lmsensors_init_component( int cidx )
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return PAPI_ENOMEM;
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}
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+ cached_counts = (long long*) calloc(num_events, sizeof(long long));
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+
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+ if (cached_counts == NULL) {
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+ strncpy(_lmsensors_vector.cmp_info.disabled_reason,
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+ "Could not malloc room",PAPI_MAX_STR_LEN);
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+ return PAPI_ENOMEM;
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+ }
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+
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if ( ( unsigned ) num_events != createNativeEvents( ) ) {
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strncpy(_lmsensors_vector.cmp_info.disabled_reason,
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"LM_SENSOR number mismatch",PAPI_MAX_STR_LEN);
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@@ -413,8 +422,7 @@ _lmsensors_init_control_state( hwd_control_state_t *ctl )
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int i;
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for ( i = 0; i < num_events; i++ )
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- ( ( _lmsensors_control_state_t * ) ctl )->counts[i] =
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- getEventValue( i );
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+ cached_counts[i] = getEventValue( i );
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( ( _lmsensors_control_state_t * ) ctl )->lastupdate =
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PAPI_get_real_usec( );
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@@ -465,12 +473,12 @@ _lmsensors_read( hwd_context_t *ctx, hwd_control_state_t *ctl,
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if ( start - control->lastupdate > 200000 ) { // cache refresh
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for ( i = 0; i < num_events; i++ ) {
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- control->counts[i] = getEventValue( i );
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+ cached_counts[i] = getEventValue( i );
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}
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control->lastupdate = PAPI_get_real_usec( );
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}
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- *events = control->counts;
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+ *events = cached_counts;
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return PAPI_OK;
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}
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@@ -478,6 +486,8 @@ _lmsensors_read( hwd_context_t *ctx, hwd_control_state_t *ctl,
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int
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_lmsensors_shutdown_component( void )
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{
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+ if (cached_counts)
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+ free(cached_counts);
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/* Call the libsensors cleaning function before leaving */
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sensors_cleanup( );
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@@ -627,8 +637,8 @@ papi_vector_t _lmsensors_vector = {
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.short_name = "lmsensors",
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.version = "5.0",
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.description = "Linux LMsensor statistics",
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- .num_mpx_cntrs = LM_SENSORS_MAX_COUNTERS,
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- .num_cntrs = LM_SENSORS_MAX_COUNTERS,
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+ .num_mpx_cntrs = 0,
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+ .num_cntrs = 0,
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.default_domain = PAPI_DOM_USER,
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//.available_domains = PAPI_DOM_USER,
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.default_granularity = PAPI_GRN_THR,
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