[scudo] lower quarantine default sizes

Summary:
After discussing the current defaults with a couple of parties, the consensus
is that they are too high. 1Mb of quarantine has about a 4Mb impact on PSS, so
memory usage goes up quickly.
This is obviously configurable, but the default value should be more
"approachable", so both the global size and the thread local size are 1/4 of
what they used to be.

Reviewers: alekseyshl, kcc

Reviewed By: alekseyshl

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D33321

llvm-svn: 303380

diff --git a/compiler-rt/lib/scudo/scudo_flags.cpp b/compiler-rt/lib/scudo/scudo_flags.cpp
index 64da1d9..90f0cbf 100644 (file)
--- a/compiler-rt/lib/scudo/scudo_flags.cpp
+++ b/compiler-rt/lib/scudo/scudo_flags.cpp
@@ -68,7 +68,7 @@ void initFlags() {
   // Sanity checks and default settings for the Quarantine parameters.
 
   if (f->QuarantineSizeMb < 0) {
-    const int DefaultQuarantineSizeMb = FIRST_32_SECOND_64(16, 64);
+    const int DefaultQuarantineSizeMb = FIRST_32_SECOND_64(4, 16);
     f->QuarantineSizeMb = DefaultQuarantineSizeMb;
   }
   // We enforce an upper limit for the quarantine size of 4Gb.
@@ -77,7 +77,7 @@ void initFlags() {
   }
   if (f->ThreadLocalQuarantineSizeKb < 0) {
     const int DefaultThreadLocalQuarantineSizeKb =
-        FIRST_32_SECOND_64(256, 1024);
+        FIRST_32_SECOND_64(64, 256);
     f->ThreadLocalQuarantineSizeKb = DefaultThreadLocalQuarantineSizeKb;
   }
   // And an upper limit of 128Mb for the thread quarantine cache.