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* [dpdk-dev] [PATCH] mem: mark pages as not accessed when reserving VA
@ 2020-03-09 14:54 David Marchand
  2020-03-09 15:27 ` Maxime Coquelin
                   ` (3 more replies)
  0 siblings, 4 replies; 5+ messages in thread
From: David Marchand @ 2020-03-09 14:54 UTC (permalink / raw)
  To: dev
  Cc: echaudro, aconole, maxime.coquelin, stable, Andrea Arcangeli,
	Anatoly Burakov

When the memory allocator reserves virtual addresses, it still does not
know what they will be used for.
Besides, huge areas are reserved for memory hotplug in multiprocess
setups. But most of the pages are unused in the whole life of the
processes.

Change protection mode to PROT_NONE when only reserving VA.
The memory allocator already switches to the right mode when making use
of it.

It also has the nice effect of getting those pages skipped by the kernel
when calling mlockall() or when a coredump gets generated.

Cc: stable@dpdk.org

Suggested-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: David Marchand <david.marchand@redhat.com>
---
 lib/librte_eal/common/eal_common_memory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/librte_eal/common/eal_common_memory.c b/lib/librte_eal/common/eal_common_memory.c
index 4a9cc1f19..cc7d54e0c 100644
--- a/lib/librte_eal/common/eal_common_memory.c
+++ b/lib/librte_eal/common/eal_common_memory.c
@@ -97,7 +97,7 @@ eal_get_virtual_area(void *requested_addr, size_t *size,
 			return NULL;
 		}
 
-		mapped_addr = mmap(requested_addr, (size_t)map_sz, PROT_READ,
+		mapped_addr = mmap(requested_addr, (size_t)map_sz, PROT_NONE,
 				mmap_flags, -1, 0);
 		if (mapped_addr == MAP_FAILED && allow_shrink)
 			*size -= page_sz;
-- 
2.23.0


^ permalink raw reply	[flat|nested] 5+ messages in thread

end of thread, other threads:[~2020-03-13  9:59 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-03-09 14:54 [dpdk-dev] [PATCH] mem: mark pages as not accessed when reserving VA David Marchand
2020-03-09 15:27 ` Maxime Coquelin
2020-03-10 13:57 ` Aaron Conole
2020-03-10 16:26 ` Burakov, Anatoly
2020-03-13  9:59 ` [dpdk-dev] [dpdk-stable] " David Marchand

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