[dpdk-dev] [PATCH v2] eal: add madvise to avoid dump memory

[Li Feng]

Avoid dump all mapped memory to a core dump file when crash.
Otherwise it will very large and it's hard to analyze with gdb.

In my test, it will dump 128GiB memory to a core dump file when integrated
to spdk with default configuration.

Signed-off-by: Li Feng <fengli at smartx.com>
---
 lib/librte_eal/common/eal_common_memory.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/lib/librte_eal/common/eal_common_memory.c b/lib/librte_eal/common/eal_common_memory.c
index cc7d54e0c..2d9564b28 100644
--- a/lib/librte_eal/common/eal_common_memory.c
+++ b/lib/librte_eal/common/eal_common_memory.c
@@ -177,6 +177,20 @@ eal_get_virtual_area(void *requested_addr, size_t *size,
 		after_len = RTE_PTR_DIFF(map_end, aligned_end);
 		if (after_len > 0)
 			munmap(aligned_end, after_len);
+
+		/*
+		 * Exclude this pages from a core dump.
+		 */
+		if (madvise(aligned_addr, *size, MADV_DONTDUMP) != 0)
+			RTE_LOG(WARNING, EAL, "Madvise with MADV_DONTDUMP failed: %s\n",
+				strerror(errno));
+	} else {
+		/*
+		 * Exclude this pages from a core dump.
+		 */
+		if (madvise(mapped_addr, map_sz, MADV_DONTDUMP) != 0)
+			RTE_LOG(WARNING, EAL, "Madvise with MADV_DONTDUMP failed: %s\n",
+				strerror(errno));
 	}
 
 	return aligned_addr;
-- 
2.11.0


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