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author | Jamie Liu <jamieliu@google.com> | 2020-10-09 13:21:14 -0700 |
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committer | gVisor bot <gvisor-bot@google.com> | 2020-10-09 13:23:30 -0700 |
commit | 6bbf66227136a29cd8e2f51166216b9a70fdfae5 (patch) | |
tree | c0d505a9bc26d34f8434998ae64fd81474abc106 /pkg/fd | |
parent | 46e168b5a00bd85f3739bac6f185c3bdc39dfa37 (diff) |
Reduce the cost of sysinfo(2).
- sysinfo(2) does not actually require a fine-grained breakdown of memory
usage. Accordingly, instead of calling pgalloc.MemoryFile.UpdateUsage() to
update the sentry's fine-grained memory accounting snapshot, just use
pgalloc.MemoryFile.TotalUsage() (which is a single fstat(), and therefore far
cheaper).
- Use the number of threads in the root PID namespace (i.e. globally) rather
than in the task's PID namespace for consistency with Linux (which just reads
global variable nr_threads), and add a new method to kernel.PIDNamespace to
allow this to be read directly from an underlying map rather than requiring
the allocation and population of an intermediate slice.
PiperOrigin-RevId: 336353100
Diffstat (limited to 'pkg/fd')
0 files changed, 0 insertions, 0 deletions