From bbaa72422bb086933890a125fd58bf199fe26f2d Mon Sep 17 00:00:00 2001
From: David Goldblatt <davidgoldblatt@fb.com>
Date: Mon, 18 Sep 2017 15:10:01 -0700
Subject: [PATCH] Add pages_dontdump and pages_dodump.

This will, eventually, enable us to avoid dumping eden regions.
---
 include/jemalloc/internal/pages.h |  2 ++
 src/pages.c                       | 23 +++++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/include/jemalloc/internal/pages.h b/include/jemalloc/internal/pages.h
index 121fff38..dff20515 100644
--- a/include/jemalloc/internal/pages.h
+++ b/include/jemalloc/internal/pages.h
@@ -69,6 +69,8 @@ bool pages_purge_lazy(void *addr, size_t size);
 bool pages_purge_forced(void *addr, size_t size);
 bool pages_huge(void *addr, size_t size);
 bool pages_nohuge(void *addr, size_t size);
+bool pages_dontdump(void *addr, size_t size);
+bool pages_dodump(void *addr, size_t size);
 bool pages_boot(void);
 
 #endif /* JEMALLOC_INTERNAL_PAGES_EXTERNS_H */
diff --git a/src/pages.c b/src/pages.c
index e8112f74..5e1043da 100644
--- a/src/pages.c
+++ b/src/pages.c
@@ -328,6 +328,29 @@ pages_nohuge(void *addr, size_t size) {
 #endif
 }
 
+bool
+pages_dontdump(void *addr, size_t size) {
+	assert(PAGE_ADDR2BASE(addr) == addr);
+	assert(PAGE_CEILING(size) == size);
+#ifdef JEMALLOC_MADVISE_DONTDUMP
+	return madvise(addr, size, MADV_DONTDUMP) != 0;
+#else
+	return false;
+#endif
+}
+
+bool
+pages_dodump(void *addr, size_t size) {
+	assert(PAGE_ADDR2BASE(addr) == addr);
+	assert(PAGE_CEILING(size) == size);
+#ifdef JEMALLOC_MADVISE_DONTDUMP
+	return madvise(addr, size, MADV_DODUMP) != 0;
+#else
+	return false;
+#endif
+}
+
+
 static size_t
 os_page_detect(void) {
 #ifdef _WIN32