[dpdk-dev] [PATCH] eal: Place EAL thread stack in a reserved per-lcore memzone

[Pavan Nikhilesh Bhagavatula]

 > lib/librte_eal/linux/eal.c | 20 ++++++++++++++++++++
> 1 file changed, 20 insertions(+)
>
>diff --git a/lib/librte_eal/linux/eal.c b/lib/librte_eal/linux/eal.c
>index 9530ee5..e047107 100644
>--- a/lib/librte_eal/linux/eal.c
>+++ b/lib/librte_eal/linux/eal.c
>@@ -68,6 +68,8 @@
>
> #define KERNEL_IOMMU_GROUPS_PATH
>"/sys/kernel/iommu_groups"
>
>+#define THREAD_STACK_SIZE_DEFAULT (4ULL * 1024ULL * 1024ULL)
>+#include <rte_memzone.h>
> /* Allow the application to print its usage message too if set */
> static rte_usage_hook_t	rte_application_usage_hook = NULL;
>
>@@ -1224,6 +1226,24 @@ static void rte_eal_init_alert(const char
>*msg)
>
> 		lcore_config[i].state = WAIT;
>
>+		pthread_attr_t attr;
>+		pthread_attr_init(&attr);
>+		size_t thread_stack_size =
>THREAD_STACK_SIZE_DEFAULT;
>+		char thread_stack_name[64];
>+		snprintf(thread_stack_name, sizeof
>thread_stack_name, "rte:lcore:%s:%d:threadstack",
>rte_eal_process_type() == RTE_PROC_PRIMARY ? "p" : "s", i);
>+		const struct rte_memzone *mz =
>rte_memzone_lookup(thread_stack_name);
>+		if (mz == NULL) {
>+			if ((mz =
>rte_memzone_reserve(thread_stack_name, thread_stack_size,
>lcore_config[i].socket_id, 0)) == NULL) {
>+				rte_panic("Cannot allocate memzone
>for thread stack");
>+			}
>+		}
>+		void *thread_stack = mz->addr;
>+
>+		if (pthread_attr_setstack(&attr, thread_stack,
>thread_stack_size) < 0) {
>+			rte_panic("Cannot set thread stack\n");
>+		}
>+		RTE_LOG(DEBUG, EAL, "Thread stack for lcore %d on
>socket %d set to %p\n", i, lcore_config[i].socket_id, thread_stack);
>+
> 		/* create a thread for each lcore */
> 		ret = pthread_create(&lcore_config[i].thread_id, NULL,
> 				     eal_thread_loop, NULL);

Don't we need to pass attr struct created above to ptherad_create as 2nd argument?.

Also, since there is no way to modify master_lcore stack space most of DPDK testsuite wouldn't show any difference.

Pavan.

>--
>1.8.3.1