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--- base/allocator/partition_allocator/page_allocator_internals_posix.h.orig 2021-04-14 18:40:48 UTC
+++ base/allocator/partition_allocator/page_allocator_internals_posix.h
@@ -28,12 +28,16 @@
#if defined(OS_ANDROID)
#include <sys/prctl.h>
#endif
-#if defined(OS_LINUX) || defined(OS_CHROMEOS)
+#if defined(OS_LINUX) || defined(OS_CHROMEOS) || defined(OS_BSD)
#include <sys/resource.h>
#include <algorithm>
#endif
+#if defined(OS_FREEBSD)
+#include <fcntl.h>
+#endif
+
#include "base/allocator/partition_allocator/page_allocator.h"
#ifndef MAP_ANONYMOUS
@@ -153,12 +157,19 @@ void* SystemAllocPagesInternal(void* hint,
PA_DCHECK(PageTag::kFirst <= page_tag);
PA_DCHECK(PageTag::kLast >= page_tag);
int fd = VM_MAKE_TAG(static_cast<int>(page_tag));
+#elif defined(OS_FREEBSD)
+ int fd = HANDLE_EINTR(open("/dev/zero", O_RDWR | O_CLOEXEC));
+ PA_PCHECK(fd != -1);
#else
int fd = -1;
#endif
int access_flag = GetAccessFlags(accessibility);
+#if defined(OS_FREEBSD)
+ int map_flags = MAP_PRIVATE;
+#else
int map_flags = MAP_ANONYMOUS | MAP_PRIVATE;
+#endif
#if defined(OS_APPLE)
// On macOS 10.14 and higher, executables that are code signed with the
@@ -185,6 +196,8 @@ void* SystemAllocPagesInternal(void* hint,
prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, ret, length,
PageTagToName(page_tag));
}
+#elif defined(OS_FREEBSD)
+ HANDLE_EINTR(close(fd));
#endif
return ret;
@@ -317,6 +330,8 @@ void DiscardSystemPagesInternal(void* address, size_t
ret = madvise(address, length, MADV_DONTNEED);
}
PA_PCHECK(ret == 0);
+#elif defined(OS_FREEBSD)
+ PA_PCHECK(0 == madvise(address, length, MADV_FREE));
#else
// We have experimented with other flags, but with suboptimal results.
//
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