[compiler-rt] [scudo] Do a M_PURGE call before changing release interval on Android (PR #87110)
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Fri Mar 29 13:44:33 PDT 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-compiler-rt-sanitizer
Author: None (ChiaHungDuan)
<details>
<summary>Changes</summary>
---
Full diff: https://github.com/llvm/llvm-project/pull/87110.diff
1 Files Affected:
- (modified) compiler-rt/lib/scudo/standalone/wrappers_c.inc (+5)
``````````diff
diff --git a/compiler-rt/lib/scudo/standalone/wrappers_c.inc b/compiler-rt/lib/scudo/standalone/wrappers_c.inc
index 56d8ef20156e28..21d5b7add51275 100644
--- a/compiler-rt/lib/scudo/standalone/wrappers_c.inc
+++ b/compiler-rt/lib/scudo/standalone/wrappers_c.inc
@@ -247,6 +247,11 @@ void SCUDO_PREFIX(malloc_postinit)() {
INTERFACE WEAK int SCUDO_PREFIX(mallopt)(int param, int value) {
if (param == M_DECAY_TIME) {
if (SCUDO_ANDROID) {
+ // Before changing the interval, reset the memory usage status by doing a
+ // M_PURGE call so that we can minimize the impact of any unreleased pages
+ // introduced by interval transition.
+ SCUDO_ALLOCATOR.releaseToOS(scudo::ReleaseToOS::Force);
+
if (value == 0) {
// Will set the release values to their minimum values.
value = INT32_MIN;
``````````
</details>
https://github.com/llvm/llvm-project/pull/87110
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