d/numam-dpdk
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

mem: mark pages as not accessed when reserving VA

Browse Source 
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>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Acked-by: Aaron Conole <aconole@redhat.com>
Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>
This commit is contained in:
David Marchand 2020-03-09 15:54:42 +01:00
parent 754b6166f5
commit 8a4baf06c1
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
lib/librte_eal/common/eal_common_memory.c
View File

@ -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;