malloc: add M_PURGE mallopt flag
Add a new mallopt flag that purges any pending decaying pages.
Test: boots and works
bug 117795621
Merged-in: Ib250ae2b705b6a368c1efb801d6a7be54e075acb
Change-Id: Ib250ae2b705b6a368c1efb801d6a7be54e075acb
diff --git a/libc/bionic/jemalloc_wrapper.cpp b/libc/bionic/jemalloc_wrapper.cpp
index 19081a4..0e82066 100644
--- a/libc/bionic/jemalloc_wrapper.cpp
+++ b/libc/bionic/jemalloc_wrapper.cpp
@@ -79,6 +79,18 @@
}
}
return 1;
+ } else if (param == M_PURGE) {
+ unsigned narenas;
+ size_t sz = sizeof(unsigned);
+ if (je_mallctl("arenas.narenas", &narenas, &sz, nullptr, 0) != 0) {
+ return 0;
+ }
+ char buffer[100];
+ snprintf(buffer, sizeof(buffer), "arena.%u.purge", narenas);
+ if (je_mallctl(buffer, nullptr, nullptr, nullptr, 0) != 0) {
+ return 0;
+ }
+ return 1;
}
return 0;
}
diff --git a/libc/include/malloc.h b/libc/include/malloc.h
index 3a678a9..d850a3b 100644
--- a/libc/include/malloc.h
+++ b/libc/include/malloc.h
@@ -79,6 +79,7 @@
/* mallopt options */
#define M_DECAY_TIME -100
+#define M_PURGE -101
int mallopt(int __option, int __value) __INTRODUCED_IN(26);
/*
