[dpdk-dev] [PATCH v3] eal: warn on legacy memory allocation requirement

[Thomas Monjalon <thomas@monjalon.net>]

When using --no-huge mode, dynamic allocation is not supported.
Because of this limitation, the option --legacy-mem is implied
and -m may be needed to specify the amount of memory to allocate.
Otherwise the default amount MEMSIZE_IF_NO_HUGE_PAGE will be allocated.

The option --socket-mem can also be used with --legacy-mem
when hugepages are supported.

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
---
v3:
	- replace "allocation" with "amount of reserved memory"
	- add --socket-mem
	- more rewording
v2:
	- user-oriented message
	- trigger warning on any legacy mem option
---
 lib/librte_eal/common/eal_common_options.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/librte_eal/common/eal_common_options.c b/lib/librte_eal/common/eal_common_options.c
index 512d5088e..ab0b6082b 100644
--- a/lib/librte_eal/common/eal_common_options.c
+++ b/lib/librte_eal/common/eal_common_options.c
@@ -1589,6 +1589,11 @@ eal_check_common_options(struct internal_config *internal_cfg)
 				"with --"OPT_MATCH_ALLOCATIONS"\n");
 		return -1;
 	}
+	if (internal_cfg->legacy_mem && internal_cfg->memory == 0) {
+		RTE_LOG(NOTICE, EAL, "Static memory layout is selected, "
+			"amount of reserved memory can be adjusted with "
+			"-m or --"OPT_SOCKET_MEM"\n");
+	}
 
 	return 0;
 }
-- 
2.21.0