[rtems commit] record: Improve overflow handling
Sebastian Huber
sebh at rtems.org
Sat Aug 17 18:16:36 UTC 2019
Module: rtems
Branch: master
Commit: 52c8ac7b694cf7aca4a6f69d7e5c9323042b8057
Changeset: http://git.rtems.org/rtems/commit/?id=52c8ac7b694cf7aca4a6f69d7e5c9323042b8057
Author: Sebastian Huber <sebastian.huber at embedded-brains.de>
Date: Fri Aug 16 18:40:55 2019 +0200
record: Improve overflow handling
In case of a ring buffer overflow, the rtems_record_drain() will push
the complete ring buffer content to the client. While the items are
processed by the client, new items may overwrite some items being
processed. The overwritten items can be detected in the following
iteration once the next tail/head information is pushed to the client.
---
cpukit/include/rtems/recordclient.h | 69 +++++++++-
cpukit/libtrace/record/record-client.c | 207 ++++++++++++++++++++++++++++--
testsuites/libtests/record02/init.c | 1 +
testsuites/libtests/record02/record02.scn | 146 ++++++++++-----------
4 files changed, 341 insertions(+), 82 deletions(-)
diff --git a/cpukit/include/rtems/recordclient.h b/cpukit/include/rtems/recordclient.h
index 01828e4..d6fe5b8 100644
--- a/cpukit/include/rtems/recordclient.h
+++ b/cpukit/include/rtems/recordclient.h
@@ -35,6 +35,7 @@
#include "recorddata.h"
+#include <stdbool.h>
#include <stddef.h>
#ifdef __cplusplus
@@ -54,7 +55,13 @@ typedef enum {
RTEMS_RECORD_CLIENT_ERROR_INVALID_MAGIC,
RTEMS_RECORD_CLIENT_ERROR_UNKNOWN_FORMAT,
RTEMS_RECORD_CLIENT_ERROR_UNSUPPORTED_VERSION,
- RTEMS_RECORD_CLIENT_ERROR_UNSUPPORTED_CPU
+ RTEMS_RECORD_CLIENT_ERROR_UNSUPPORTED_CPU,
+ RTEMS_RECORD_CLIENT_ERROR_UNSUPPORTED_CPU_MAX,
+ RTEMS_RECORD_CLIENT_ERROR_DOUBLE_CPU_MAX,
+ RTEMS_RECORD_CLIENT_ERROR_DOUBLE_PER_CPU_COUNT,
+ RTEMS_RECORD_CLIENT_ERROR_NO_CPU_MAX,
+ RTEMS_RECORD_CLIENT_ERROR_NO_MEMORY,
+ RTEMS_RECORD_CLIENT_ERROR_PER_CPU_ITEMS_OVERFLOW
} rtems_record_client_status;
typedef rtems_record_client_status ( *rtems_record_client_handler )(
@@ -67,21 +74,69 @@ typedef rtems_record_client_status ( *rtems_record_client_handler )(
);
typedef struct {
+ /**
+ * @brief Event time to uptime maintenance.
+ */
struct {
uint64_t bt;
uint32_t time_at_bt;
uint32_t time_last;
uint32_t time_accumulated;
} uptime;
+
+ /**
+ * @brief The current or previous ring buffer tail.
+ *
+ * Indexed by the tail_head_index member.
+ */
uint32_t tail[ 2 ];
+
+ /**
+ * @brief The current or previous ring buffer head.
+ *
+ * Indexed by the tail_head_index member.
+ */
uint32_t head[ 2 ];
+
+ /**
+ * @brief The index of the tail and head members.
+ *
+ * This index is used to maintain the current and previous tail/head
+ * positions to detect ring buffer overflows.
+ */
size_t tail_head_index;
+
+ /**
+ * @brief If true, then hold back items for overflow or initial ramp up
+ * processing.
+ */
+ bool hold_back;
+
+ /**
+ * @brief Storage for hold back items.
+ *
+ * In case of a ring buffer overflow, the rtems_record_drain() will push the
+ * complete ring buffer content to the client. While the items are processed
+ * by the client, new items may overwrite some items being processed. The
+ * overwritten items can be detected in the following iteration once the next
+ * tail/head information is pushed to the client.
+ *
+ * In case of the initial ramp up, the items are stored in the hold back
+ * buffer to determine the uptime of the first event.
+ */
+ rtems_record_item_64 *items;
+
+ /**
+ * @brief The index for the next hold back item.
+ */
+ size_t item_index;
} rtems_record_client_per_cpu;
typedef struct rtems_record_client_context {
uint64_t to_bt_scaler;
rtems_record_client_per_cpu per_cpu[ RTEMS_RECORD_CLIENT_MAXIMUM_CPU_COUNT ];
uint32_t cpu;
+ uint32_t cpu_count;
uint32_t count;
union {
rtems_record_item_32 format_32;
@@ -128,6 +183,18 @@ rtems_record_client_status rtems_record_client_run(
size_t n
);
+/**
+ * @brief Drains all internal buffers and frees the allocated resources.
+ *
+ * The client context must not be used afterwards. It can be re-initialized
+ * via rtems_record_client_init().
+ *
+ * @param ctx The record client context.
+ */
+void rtems_record_client_destroy(
+ rtems_record_client_context *ctx
+);
+
/** @} */
#ifdef __cplusplus
diff --git a/cpukit/libtrace/record/record-client.c b/cpukit/libtrace/record/record-client.c
index db79410..d97fe51 100644
--- a/cpukit/libtrace/record/record-client.c
+++ b/cpukit/libtrace/record/record-client.c
@@ -36,8 +36,17 @@
#include <rtems/recordclient.h>
+#include <stdlib.h>
#include <string.h>
+#define TIME_MASK ( ( UINT32_C( 1 ) << RTEMS_RECORD_TIME_BITS ) - 1 )
+
+static rtems_record_client_status visit(
+ rtems_record_client_context *ctx,
+ uint32_t time_event,
+ uint64_t data
+);
+
static void set_to_bt_scaler(
rtems_record_client_context *ctx,
uint32_t frequency
@@ -74,16 +83,84 @@ static rtems_record_client_status call_handler(
static void signal_overflow(
const rtems_record_client_context *ctx,
- const rtems_record_client_per_cpu *per_cpu,
+ rtems_record_client_per_cpu *per_cpu,
uint32_t data
)
{
- uint64_t bt;
+ per_cpu->hold_back = true;
+ per_cpu->item_index = 0;
+ call_handler( ctx, 0, RTEMS_RECORD_PER_CPU_OVERFLOW, data );
+}
+
+static void resolve_hold_back(
+ rtems_record_client_context *ctx,
+ rtems_record_client_per_cpu *per_cpu
+)
+{
+ if ( per_cpu->hold_back ) {
+ uint32_t last_head;
+ uint32_t new_head;
+ uint32_t overwritten;
+ uint32_t index;
+ uint32_t first;
+ uint32_t last;
+ uint32_t delta;
+ uint64_t uptime;
+
+ per_cpu->hold_back = false;
+
+ last_head = per_cpu->head[ per_cpu->tail_head_index ];
+ new_head = per_cpu->head[ per_cpu->tail_head_index ^ 1 ];
+ overwritten = new_head - last_head;
+
+ if ( overwritten >= per_cpu->item_index ) {
+ return;
+ }
+
+ if ( overwritten > 0 ) {
+ call_handler( ctx, 0, RTEMS_RECORD_PER_CPU_OVERFLOW, overwritten );
+ }
+
+ first = RTEMS_RECORD_GET_TIME( per_cpu->items[ overwritten ].event );
+ last = first;
+ delta = 0;
+ uptime = 0;
+
+ for ( index = overwritten; index < per_cpu->item_index; ++index ) {
+ const rtems_record_item_64 *item;
+ rtems_record_event event;
+ uint32_t time;
+
+ item = &per_cpu->items[ index ];
+ event = RTEMS_RECORD_GET_EVENT( item->event );
+ time = RTEMS_RECORD_GET_TIME( item->event );
+ delta += ( time - last ) & TIME_MASK;
+ last = time;
+
+ if (
+ event == RTEMS_RECORD_UPTIME_LOW
+ && index + 1 < per_cpu->item_index
+ && RTEMS_RECORD_GET_EVENT( ( item + 1 )->event )
+ == RTEMS_RECORD_UPTIME_HIGH
+ ) {
+ uptime = (uint32_t) item->data;
+ uptime += ( item + 1 )->data << 32;
+ break;
+ }
+ }
- bt = ( per_cpu->uptime.time_accumulated * ctx->to_bt_scaler ) >> 31;
- bt += per_cpu->uptime.bt;
+ per_cpu->uptime.bt = uptime - ( ( delta * ctx->to_bt_scaler ) >> 31 );
+ per_cpu->uptime.time_at_bt = first;
+ per_cpu->uptime.time_last = first;
+ per_cpu->uptime.time_accumulated = 0;
- call_handler( ctx, bt, RTEMS_RECORD_PER_CPU_OVERFLOW, data );
+ for ( index = overwritten; index < per_cpu->item_index; ++index ) {
+ const rtems_record_item_64 *item;
+
+ item = &per_cpu->items[ index ];
+ visit( ctx, item->event, item->data );
+ }
+ }
}
static void process_per_cpu_head(
@@ -113,6 +190,12 @@ static void process_per_cpu_head(
last_head = per_cpu->head[ per_cpu->tail_head_index ];
if ( last_tail == last_head ) {
+ if ( per_cpu->uptime.bt == 0 ) {
+ per_cpu->hold_back = true;
+ } else {
+ resolve_hold_back( ctx, per_cpu );
+ }
+
return;
}
@@ -120,12 +203,79 @@ static void process_per_cpu_head(
new_content = new_head - last_head;
if ( new_content <= capacity ) {
+ resolve_hold_back( ctx, per_cpu );
return;
}
signal_overflow( ctx, per_cpu, new_content - capacity );
}
+static rtems_record_client_status process_per_cpu_count(
+ rtems_record_client_context *ctx,
+ uint64_t data
+)
+{
+ size_t per_cpu_items;
+ rtems_record_item_64 *items;
+ uint32_t cpu;
+
+ if ( ctx->count != 0 ) {
+ return RTEMS_RECORD_CLIENT_ERROR_DOUBLE_PER_CPU_COUNT;
+ }
+
+ if ( ctx->cpu_count == 0 ) {
+ return RTEMS_RECORD_CLIENT_ERROR_NO_CPU_MAX;
+ }
+
+ ctx->count = (uint32_t) data;
+
+ /*
+ * The ring buffer capacity plus two items for RTEMS_RECORD_PROCESSOR and
+ * RTEMS_RECORD_PER_CPU_TAIL.
+ */
+ per_cpu_items = ctx->count + 1;
+
+ items = malloc( per_cpu_items * ctx->cpu_count * sizeof( *items ) );
+
+ if ( items == NULL ) {
+ return RTEMS_RECORD_CLIENT_ERROR_NO_MEMORY;
+ }
+
+ for ( cpu = 0; cpu < ctx->cpu_count; ++cpu ) {
+ ctx->per_cpu[ cpu ].items = items;
+ items += per_cpu_items;
+ }
+
+ return RTEMS_RECORD_CLIENT_SUCCESS;
+}
+
+static rtems_record_client_status hold_back(
+ rtems_record_client_context *ctx,
+ rtems_record_client_per_cpu *per_cpu,
+ uint32_t time_event,
+ rtems_record_event event,
+ uint64_t data
+)
+{
+ if ( event != RTEMS_RECORD_PER_CPU_HEAD ) {
+ uint32_t item_index;
+
+ item_index = per_cpu->item_index;
+
+ if ( item_index <= ctx->count ) {
+ per_cpu->items[ item_index ].event = time_event;
+ per_cpu->items[ item_index ].data = data;
+ per_cpu->item_index = item_index + 1;
+ } else {
+ return RTEMS_RECORD_CLIENT_ERROR_PER_CPU_ITEMS_OVERFLOW;
+ }
+ } else {
+ return call_handler( ctx, 0, RTEMS_RECORD_GET_EVENT( time_event ), data );
+ }
+
+ return RTEMS_RECORD_CLIENT_SUCCESS;
+}
+
static rtems_record_client_status visit(
rtems_record_client_context *ctx,
uint32_t time_event,
@@ -136,6 +286,7 @@ static rtems_record_client_status visit(
uint32_t time;
rtems_record_event event;
uint64_t bt;
+ rtems_record_client_status status;
per_cpu = &ctx->per_cpu[ ctx->cpu ];
time = RTEMS_RECORD_GET_TIME( time_event );
@@ -143,7 +294,7 @@ static rtems_record_client_status visit(
switch ( event ) {
case RTEMS_RECORD_PROCESSOR:
- if ( data >= RTEMS_RECORD_CLIENT_MAXIMUM_CPU_COUNT ) {
+ if ( data >= ctx->cpu_count ) {
return RTEMS_RECORD_CLIENT_ERROR_UNSUPPORTED_CPU;
}
@@ -167,8 +318,24 @@ static rtems_record_client_status visit(
case RTEMS_RECORD_PER_CPU_HEAD:
process_per_cpu_head( ctx, per_cpu, data );
break;
+ case RTEMS_RECORD_PROCESSOR_MAXIMUM:
+ if ( data >= RTEMS_RECORD_CLIENT_MAXIMUM_CPU_COUNT ) {
+ return RTEMS_RECORD_CLIENT_ERROR_UNSUPPORTED_CPU_MAX;
+ }
+
+ if ( ctx->cpu_count != 0 ) {
+ return RTEMS_RECORD_CLIENT_ERROR_DOUBLE_CPU_MAX;
+ }
+
+ ctx->cpu_count = (uint32_t) data + 1;
+ break;
case RTEMS_RECORD_PER_CPU_COUNT:
- ctx->count = (uint32_t) data;
+ status = process_per_cpu_count( ctx, data );
+
+ if ( status != RTEMS_RECORD_CLIENT_SUCCESS ) {
+ return status;
+ }
+
break;
case RTEMS_RECORD_FREQUENCY:
set_to_bt_scaler( ctx, (uint32_t) data );
@@ -183,11 +350,14 @@ static rtems_record_client_status visit(
break;
}
+ if ( per_cpu->hold_back ) {
+ return hold_back( ctx, per_cpu, time_event, event, data );
+ }
+
if ( time != 0 ) {
uint32_t delta;
- delta = ( time - per_cpu->uptime.time_last )
- & ( ( UINT32_C( 1 ) << RTEMS_RECORD_TIME_BITS ) - 1 );
+ delta = ( time - per_cpu->uptime.time_last ) & TIME_MASK;
per_cpu->uptime.time_last = time;
per_cpu->uptime.time_accumulated += delta;
bt = ( per_cpu->uptime.time_accumulated * ctx->to_bt_scaler ) >> 31;
@@ -471,3 +641,22 @@ rtems_record_client_status rtems_record_client_run(
{
return ( *ctx->consume )( ctx, buf, n );
}
+
+void rtems_record_client_destroy(
+ rtems_record_client_context *ctx
+)
+{
+ uint32_t cpu;
+
+ for ( cpu = 0; cpu < ctx->cpu_count; ++cpu ) {
+ rtems_record_client_per_cpu *per_cpu;
+
+ ctx->cpu = cpu;
+ per_cpu = &ctx->per_cpu[ cpu ];
+ per_cpu->head[ per_cpu->tail_head_index ^ 1 ] =
+ per_cpu->head[ per_cpu->tail_head_index ];
+ resolve_hold_back( ctx, per_cpu );
+ }
+
+ free( ctx->per_cpu[ 0 ].items );
+}
diff --git a/testsuites/libtests/record02/init.c b/testsuites/libtests/record02/init.c
index 5aeeb18..f1c93f7 100644
--- a/testsuites/libtests/record02/init.c
+++ b/testsuites/libtests/record02/init.c
@@ -105,6 +105,7 @@ static void Init(rtems_task_argument arg)
cs = rtems_record_client_run(&ctx->client, &header, sizeof(header));
rtems_test_assert(cs == RTEMS_RECORD_CLIENT_SUCCESS);
rtems_record_drain(drain_visitor, ctx);
+ rtems_record_client_destroy(&ctx->client);
TEST_END();
rtems_test_exit(0);
diff --git a/testsuites/libtests/record02/record02.scn b/testsuites/libtests/record02/record02.scn
index 487c601..4535cbb 100644
--- a/testsuites/libtests/record02/record02.scn
+++ b/testsuites/libtests/record02/record02.scn
@@ -1,82 +1,84 @@
*** BEGIN OF TEST RECORD 2 ***
-*** TEST VERSION: 5.0.0.f0ae613ba72bc4b95797e2482c4bd0fa5546331d
+*** TEST VERSION: 5.0.0.b2c060a507712f6043d7c7f0cf7b50661f25d8c3
*** TEST STATE: EXPECTED-PASS
-*** TEST BUILD: RTEMS_NETWORKING
-*** TEST TOOLS: 7.4.0 20181206 (RTEMS 5, RSB 376edee1c734fb412b731a7d9e57757dd4cc5f07, Newlib dc6e94551f09d3a983afd571478d63a09d6f66fa)
-*:0:VERSION:1
+*** TEST BUILD: RTEMS_NETWORKING RTEMS_POSIX_API
+*** TEST TOOLS: 7.4.1 20190514 (RTEMS 5, RSB 639eed3c77c830a2ac9f36baca21919f8b7bf1be, Newlib 5c2a3661c)
+*:0:VERSION:5
*:0:PROCESSOR_MAXIMUM:0
-*:0:COUNT:80
+*:0:PER_CPU_COUNT:80
*:0:FREQUENCY:f4240
*:0:PROCESSOR:0
-*:0:TAIL:0
-*:0:HEAD:44
+*:0:PER_CPU_TAIL:0
+*:0:PER_CPU_HEAD:46
*:0:THREAD_CREATE:9010001
+*:0:THREAD_NAME:49494949
*:0:THREAD_START:9010001
-*:0:UPTIME_LOW:9a240
+*:0:UPTIME_LOW:852b4
*:0:UPTIME_HIGH:1
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+1.085067999:0:THREAD_SWITCH_IN:a010001
+1.085207999:0:THREAD_SWITCH_OUT:a010001
+1.085207999:0:THREAD_STACK_CURRENT:d78
+1.085207999:0:THREAD_SWITCH_IN:9010001
+1.095067999:0:THREAD_SWITCH_OUT:9010001
+1.095067999:0:THREAD_STACK_CURRENT:d68
+1.095067999:0:THREAD_SWITCH_IN:a010001
*** END OF TEST RECORD 2 ***
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