From 38de91a5dae2101b6e70ef50e77defcd211ac4c1 Mon Sep 17 00:00:00 2001
From: "mic.besace" <mic.besace@gmail.com>
Date: Tue, 16 Aug 2016 05:00:38 -0700
Subject: [PATCH] Solaris/OpenBSD/FreeBSD: [heap] Uncommit unused large object
 page memory.

Port d61a5c376ba51145dc4684e39d5d3a9ce75bcfa6

Original commit message:

    As a first step I uncommit the memory on the main thread. Also
    to measure impact and stability of that optimization. In a
    follow-up CL, the uncommitting should be moved on the concurrent thread.

R=jochen@chromium.org, hpayer@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2245703002
Cr-Commit-Position: refs/heads/master@{#38654}
---
 AUTHORS                               | 3 ++-
 src/base/platform/platform-freebsd.cc | 4 ++++
 src/base/platform/platform-openbsd.cc | 4 ++++
 src/base/platform/platform-solaris.cc | 4 ++++
 4 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/AUTHORS b/AUTHORS
index 28873901a9..d70be77d86 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -89,6 +89,7 @@ Matthew Sporleder <msporleder@gmail.com>
 Maxim Mossienko <maxim.mossienko@gmail.com>
 Michael Lutz <michi@icosahedron.de>
 Michael Smith <mike@w3.org>
+Michaël Zasso <mic.besace@gmail.com>
 Mike Gilbert <floppymaster@gmail.com>
 Mike Pennisi <mike@mikepennisi.com>
 Milton Chiang <milton.chiang@mediatek.com>
@@ -118,4 +119,4 @@ Vladimir Shutoff <vovan@shutoff.ru>
 Yu Yin <xwafish@gmail.com>
 Zac Hansen <xaxxon@gmail.com>
 Zhongping Wang <kewpie.w.zp@gmail.com>
-柳荣一 <admin@web-tinker.com>
\ No newline at end of file
+柳荣一 <admin@web-tinker.com>
diff --git a/src/base/platform/platform-freebsd.cc b/src/base/platform/platform-freebsd.cc
index 413e193744..efb1872f35 100644
--- a/src/base/platform/platform-freebsd.cc
+++ b/src/base/platform/platform-freebsd.cc
@@ -246,6 +246,10 @@ bool VirtualMemory::UncommitRegion(void* base, size_t size) {
               kMmapFdOffset) != MAP_FAILED;
 }
 
+bool VirtualMemory::ReleasePartialRegion(void* base, size_t size,
+                                         void* free_start, size_t free_size) {
+  return munmap(free_start, free_size) == 0;
+}
 
 bool VirtualMemory::ReleaseRegion(void* base, size_t size) {
   return munmap(base, size) == 0;
diff --git a/src/base/platform/platform-openbsd.cc b/src/base/platform/platform-openbsd.cc
index 6ecf1f12ba..29c518a898 100644
--- a/src/base/platform/platform-openbsd.cc
+++ b/src/base/platform/platform-openbsd.cc
@@ -277,6 +277,10 @@ bool VirtualMemory::UncommitRegion(void* base, size_t size) {
               kMmapFdOffset) != MAP_FAILED;
 }
 
+bool VirtualMemory::ReleasePartialRegion(void* base, size_t size,
+                                         void* free_start, size_t free_size) {
+  return munmap(free_start, free_size) == 0;
+}
 
 bool VirtualMemory::ReleaseRegion(void* base, size_t size) {
   return munmap(base, size) == 0;
diff --git a/src/base/platform/platform-solaris.cc b/src/base/platform/platform-solaris.cc
index 1764978883..6783c6ba89 100644
--- a/src/base/platform/platform-solaris.cc
+++ b/src/base/platform/platform-solaris.cc
@@ -198,6 +198,10 @@ bool VirtualMemory::UncommitRegion(void* base, size_t size) {
               kMmapFdOffset) != MAP_FAILED;
 }
 
+bool VirtualMemory::ReleasePartialRegion(void* base, size_t size,
+                                         void* free_start, size_t free_size) {
+  return munmap(free_start, free_size) == 0;
+}
 
 bool VirtualMemory::ReleaseRegion(void* base, size_t size) {
   return munmap(base, size) == 0;