| commit | 538a2c631db36d0f69ad6413bc3270c7dc660e58 | [log] [tgz] |
|---|---|---|
| author | Vincent Donnefort <vdonnefort@google.com> | Wed Mar 20 16:01:10 2024 +0000 |
| committer | Vincent Donnefort <vdonnefort@google.com> | Fri May 10 17:03:45 2024 +0100 |
| tree | dc8eb41eef26e5628e404f51bc611d8f31da15ab | |
| parent | fe6eaa2122e964eb298f75a6698432fe9c1789b5 [diff] |
virtmgr: Pass hugepages to crosvm
Now crosvm applies block alignment ("arm64: Align RAM region with the
block size") when mmaping the RAM region for a VM, it is possible to
back this memory with THP (transparent-hugepages). This is controlled by
either the VM config option "hugepages" or the "bin/vm" option
"--hugepages"
Enabling --hugepages makes crosvm "madvise(MADV_HUGEPAGE)" that region.
This will have at the moment no effect on Android as the default value
for /sys/kernel/mm/transparent_hugepages/shmem_enabled is [never].
However, it'll enable OEMs to turn on the feature by tweaking the latter
knob.
Using THP brings a significant performance improvement by reducing the
number of fault necessary when using a VM (/512 for a 4K pages Arm
machine) and reducing the pressure on the TLB (for both stage-1 and
stage-2). However, finding huge pages might be a difficult task when the
system has been running for a long time and the memory is quite
fragmented. khugepaged helps promoting pages to huge-pages but running
it has a cost and might delay the memory allocation depending on the
chosen defrag policy.
Bug: 278011447
Change-Id: I954f93df4f08ad015958d36d115d9f9e0c3547b5
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