[esan|wset] Add 8-level working set snapshot accumulation

Summary:
Adds a new option -snapshot_step controlling the frequency distribution for
an 8-level series of samples using each bit of each shadow byte.
Implements accumulation from each level to the next higher level at the
specified frequency.

Adds storage of the 8 series of samples using CircularBuffer instances.
Fixes an error in the circular buffer data structure where a static
object's destructor will be called too early.

Prints the results out at the end in a simple manner to give us something
to start with.

Updates the workingset-samples test to test the new feature.

Reviewers: aizatsky

Subscribers: vitalybuka, zhaoqin, kcc, eugenis, llvm-commits, kubabrecka

Differential Revision: http://reviews.llvm.org/D20833

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@271683 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 16 insertions, 3 deletions

diff --git a/test/esan/TestCases/workingset-samples.cpp b/test/esan/TestCases/workingset-samples.cpp
index cb0ce01e8..6ca1a2ccc 100644
--- a/test/esan/TestCases/workingset-samples.cpp
+++ b/test/esan/TestCases/workingset-samples.cpp
@@ -1,5 +1,5 @@
 // RUN: %clang_esan_wset -O0 %s -o %t 2>&1
-// RUN: %env_esan_opts=verbosity=1 %run %t 2>&1 | FileCheck %s
+// RUN: %run %t 2>&1 | FileCheck %s
 
 #include <sched.h>
 #include <stdlib.h>
@@ -19,8 +19,21 @@ int main(int argc, char **argv) {
   for (int i = 0; i < size; ++i)
     buf[i] = i;
   munmap(buf, size);
-  // CHECK:      {{.*}}EfficiencySanitizer: snapshot {{.*}}
-  // CHECK-NEXT: {{.*}}EfficiencySanitizer: snapshot {{.*}}
+  // We only check for a few samples here to reduce the chance of flakiness.
+  // CHECK:      =={{[0-9]+}}== Total number of samples: {{[0-9]+}}
+  // CHECK-NEXT: =={{[0-9]+}}== Samples array #0 at period 20 ms
+  // CHECK-NEXT: =={{[0-9]+}}==#   0: {{[ 0-9]+}} KB ({{[ 0-9]+}} cache lines)
+  // CHECK-NEXT: =={{[0-9]+}}==#   1: {{[ 0-9]+}} KB ({{[ 0-9]+}} cache lines)
+  // CHECK-NEXT: =={{[0-9]+}}==#   2: {{[ 0-9]+}} KB ({{[ 0-9]+}} cache lines)
+  // CHECK-NEXT: =={{[0-9]+}}==#   3: {{[ 0-9]+}} KB ({{[ 0-9]+}} cache lines)
+  // CHECK:      =={{[0-9]+}}== Samples array #1 at period 80 ms
+  // CHECK-NEXT: =={{[0-9]+}}==#   0: {{[ 0-9]+}} KB ({{[ 0-9]+}} cache lines)
+  // CHECK:      =={{[0-9]+}}== Samples array #2 at period 320 ms
+  // CHECK:      =={{[0-9]+}}== Samples array #3 at period 1280 ms
+  // CHECK:      =={{[0-9]+}}== Samples array #4 at period 5120 ms
+  // CHECK:      =={{[0-9]+}}== Samples array #5 at period 20 sec
+  // CHECK:      =={{[0-9]+}}== Samples array #6 at period 81 sec
+  // CHECK:      =={{[0-9]+}}== Samples array #7 at period 327 sec
   // CHECK: {{.*}} EfficiencySanitizer: the total working set size: 32 MB (5242{{[0-9][0-9]}} cache lines)
   return 0;
 }