Summary:
Call NanoTime() in primary 64 bit allocator only when necessary,
otherwise the unwarranted syscall causes problems in sandbox environments.
ReleaseToOSIntervalMs() conditional allows them to turn the feature off
with allocator_release_to_os_interval_ms=-1 flag.
Reviewers: eugenis
Subscribers: kubamracek, llvm-commits
Differential Revision: https://reviews.llvm.org/D39624
llvm-svn: 317386
// preventing just allocated memory from being released sooner than
// necessary and also preventing extraneous ReleaseMemoryPagesToOS calls
// for short lived processes.
- region->rtoi.last_release_at_ns = NanoTime();
+ // Do it only when the feature is turned on, to avoid a potentially
+ // extraneous syscall.
+ if (ReleaseToOSIntervalMs() >= 0)
+ region->rtoi.last_release_at_ns = NanoTime();
}
// Do the mmap for the user memory.
uptr map_size = kUserMapSize;