tree 44a01387b2fcdda602019cefa3bf78b6535b2caa
parent 94af5824acb28f9756fb8246f95f78c4026228e2
author Nicolas Geoffray <ngeoffray@google.com> 1569847551 +0100
committer Nicolas Geoffray <ngeoffray@google.com> 1570367349 +0000

Share boot image methods memory in JIT zygote.

Once the zygote is done compiling, copy the ArtMethods to
shared memory that will be in-place remapped. This is
a memory optimization that enables memory sharing between
zygote and early forked processes.

Currently relies on undefined behavior of the kernel, but will
follow-up with a CL that uses file sealing that will address this.

Saves around 2MB of memory for processes forked before zygote is
done compiling - there are around a dozen of processes.

Bug: 119800099
Test: boots, PostLaunchMemoryUsage
Change-Id: Ia1bdbd1abd27f28b087d9f33aca4cd901d55082f