diff mbox series

[v3,4/9] eal: introduce thread uninit helper

Message ID 20200622132531.21857-5-david.marchand@redhat.com (mailing list archive)
State Superseded, archived
Delegated to: Thomas Monjalon
Headers show
Series Register non-EAL threads as lcore | expand

Checks

Context Check Description
ci/Intel-compilation success Compilation OK
ci/checkpatch success coding style OK

Commit Message

David Marchand June 22, 2020, 1:25 p.m. UTC
This is a preparation step for dynamically unregistering threads.

Since we explicitly allocate a per thread trace buffer in
rte_thread_init, add an internal helper to free this buffer.

Signed-off-by: David Marchand <david.marchand@redhat.com>
---
Note: I preferred renaming the current internal function to free all
threads trace buffers (new name trace_mem_free()) and reuse the previous
name (trace_mem_per_thread_free()) when freeing this buffer for a given
thread.

Changes since v2:
- added missing stub for windows tracing support,
- moved free symbol to exported (experimental) ABI as a counterpart of
  the alloc symbol we already had,

Changes since v1:
- rebased on master, removed Windows workaround wrt traces support,

---
 lib/librte_eal/common/eal_common_thread.c |  9 ++++
 lib/librte_eal/common/eal_common_trace.c  | 51 +++++++++++++++++++----
 lib/librte_eal/common/eal_thread.h        |  5 +++
 lib/librte_eal/common/eal_trace.h         |  2 +-
 lib/librte_eal/include/rte_trace_point.h  |  9 ++++
 lib/librte_eal/rte_eal_version.map        |  3 ++
 lib/librte_eal/windows/eal.c              |  5 +++
 7 files changed, 75 insertions(+), 9 deletions(-)
diff mbox series

Patch

diff --git a/lib/librte_eal/common/eal_common_thread.c b/lib/librte_eal/common/eal_common_thread.c
index afb30236c5..3b30cc99d9 100644
--- a/lib/librte_eal/common/eal_common_thread.c
+++ b/lib/librte_eal/common/eal_common_thread.c
@@ -20,6 +20,7 @@ 
 #include "eal_internal_cfg.h"
 #include "eal_private.h"
 #include "eal_thread.h"
+#include "eal_trace.h"
 
 RTE_DEFINE_PER_LCORE(unsigned int, _lcore_id) = LCORE_ID_ANY;
 RTE_DEFINE_PER_LCORE(int, _thread_id) = -1;
@@ -161,6 +162,14 @@  rte_thread_init(unsigned int lcore_id, rte_cpuset_t *cpuset)
 	__rte_trace_mem_per_thread_alloc();
 }
 
+void
+rte_thread_uninit(void)
+{
+	__rte_trace_mem_per_thread_free();
+
+	RTE_PER_LCORE(_lcore_id) = LCORE_ID_ANY;
+}
+
 struct rte_thread_ctrl_params {
 	void *(*start_routine)(void *);
 	void *arg;
diff --git a/lib/librte_eal/common/eal_common_trace.c b/lib/librte_eal/common/eal_common_trace.c
index 875553d7e5..3e620d76ed 100644
--- a/lib/librte_eal/common/eal_common_trace.c
+++ b/lib/librte_eal/common/eal_common_trace.c
@@ -101,7 +101,7 @@  eal_trace_fini(void)
 {
 	if (!rte_trace_is_enabled())
 		return;
-	trace_mem_per_thread_free();
+	trace_mem_free();
 	trace_metadata_destroy();
 	eal_trace_args_free();
 }
@@ -370,24 +370,59 @@  __rte_trace_mem_per_thread_alloc(void)
 	rte_spinlock_unlock(&trace->lock);
 }
 
+static void
+trace_mem_per_thread_free_unlocked(struct thread_mem_meta *meta)
+{
+	if (meta->area == TRACE_AREA_HUGEPAGE)
+		eal_free_no_trace(meta->mem);
+	else if (meta->area == TRACE_AREA_HEAP)
+		free(meta->mem);
+}
+
+void
+__rte_trace_mem_per_thread_free(void)
+{
+	struct trace *trace = trace_obj_get();
+	struct __rte_trace_header *header;
+	uint32_t count;
+
+	if (RTE_PER_LCORE(trace_mem) == NULL)
+		return;
+
+	header = RTE_PER_LCORE(trace_mem);
+	rte_spinlock_lock(&trace->lock);
+	for (count = 0; count < trace->nb_trace_mem_list; count++) {
+		if (trace->lcore_meta[count].mem == header)
+			break;
+	}
+	if (count != trace->nb_trace_mem_list) {
+		struct thread_mem_meta *meta = &trace->lcore_meta[count];
+
+		trace_mem_per_thread_free_unlocked(meta);
+		if (count != trace->nb_trace_mem_list - 1) {
+			memmove(meta, meta + 1,
+				sizeof(*meta) *
+				 (trace->nb_trace_mem_list - count - 1));
+		}
+		trace->nb_trace_mem_list--;
+	}
+	rte_spinlock_unlock(&trace->lock);
+}
+
 void
-trace_mem_per_thread_free(void)
+trace_mem_free(void)
 {
 	struct trace *trace = trace_obj_get();
 	uint32_t count;
-	void *mem;
 
 	if (!rte_trace_is_enabled())
 		return;
 
 	rte_spinlock_lock(&trace->lock);
 	for (count = 0; count < trace->nb_trace_mem_list; count++) {
-		mem = trace->lcore_meta[count].mem;
-		if (trace->lcore_meta[count].area == TRACE_AREA_HUGEPAGE)
-			eal_free_no_trace(mem);
-		else if (trace->lcore_meta[count].area == TRACE_AREA_HEAP)
-			free(mem);
+		trace_mem_per_thread_free_unlocked(&trace->lcore_meta[count]);
 	}
+	trace->nb_trace_mem_list = 0;
 	rte_spinlock_unlock(&trace->lock);
 }
 
diff --git a/lib/librte_eal/common/eal_thread.h b/lib/librte_eal/common/eal_thread.h
index da5e7c93ba..4ecd8fd53a 100644
--- a/lib/librte_eal/common/eal_thread.h
+++ b/lib/librte_eal/common/eal_thread.h
@@ -25,6 +25,11 @@  __rte_noreturn void *eal_thread_loop(void *arg);
  */
 void rte_thread_init(unsigned int lcore_id, rte_cpuset_t *cpuset);
 
+/**
+ * Uninitialize per-lcore info for current thread.
+ */
+void rte_thread_uninit(void);
+
 /**
  * Get the NUMA socket id from cpu id.
  * This function is private to EAL.
diff --git a/lib/librte_eal/common/eal_trace.h b/lib/librte_eal/common/eal_trace.h
index 8f60616156..bbb6e1645c 100644
--- a/lib/librte_eal/common/eal_trace.h
+++ b/lib/librte_eal/common/eal_trace.h
@@ -106,7 +106,7 @@  int trace_metadata_create(void);
 void trace_metadata_destroy(void);
 int trace_mkdir(void);
 int trace_epoch_time_save(void);
-void trace_mem_per_thread_free(void);
+void trace_mem_free(void);
 
 /* EAL interface */
 int eal_trace_init(void);
diff --git a/lib/librte_eal/include/rte_trace_point.h b/lib/librte_eal/include/rte_trace_point.h
index 377c2414aa..686b86fdb1 100644
--- a/lib/librte_eal/include/rte_trace_point.h
+++ b/lib/librte_eal/include/rte_trace_point.h
@@ -230,6 +230,15 @@  __rte_trace_point_fp_is_enabled(void)
 __rte_experimental
 void __rte_trace_mem_per_thread_alloc(void);
 
+/**
+ * @internal
+ *
+ * Free trace memory buffer per thread.
+ *
+ */
+__rte_experimental
+void __rte_trace_mem_per_thread_free(void);
+
 /**
  * @internal
  *
diff --git a/lib/librte_eal/rte_eal_version.map b/lib/librte_eal/rte_eal_version.map
index 0d42d44ce9..5831eea4b0 100644
--- a/lib/librte_eal/rte_eal_version.map
+++ b/lib/librte_eal/rte_eal_version.map
@@ -393,6 +393,9 @@  EXPERIMENTAL {
 	rte_trace_point_lookup;
 	rte_trace_regexp;
 	rte_trace_save;
+
+	# added in 20.08
+	__rte_trace_mem_per_thread_free;
 };
 
 INTERNAL {
diff --git a/lib/librte_eal/windows/eal.c b/lib/librte_eal/windows/eal.c
index 23de12ab43..09cc1aef63 100644
--- a/lib/librte_eal/windows/eal.c
+++ b/lib/librte_eal/windows/eal.c
@@ -255,6 +255,11 @@  __rte_trace_mem_per_thread_alloc(void)
 {
 }
 
+void
+__rte_trace_mem_per_thread_free(void)
+{
+}
+
 void
 __rte_trace_point_emit_field(size_t sz, const char *field,
 	const char *type)