From 74f108a67199e625bebdf9b9079b0e20f9149903 Mon Sep 17 00:00:00 2001
From: Sarah Pham <smpham@google.com>
Date: Fri, 20 Jan 2023 10:18:19 +1100
Subject: [PATCH] Add Fuchsia support to memory_usage.

Implement GetProcessResidentSizeBytes for Fuchsia.

Bug: webrtc:14825
Change-Id: I64582ce0da72d3bb0fa61ff64799a1a165e1192f
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/290922
Commit-Queue: Sarah Pham <smpham@google.com>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#39154}
---
 rtc_base/memory_usage.cc | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/rtc_base/memory_usage.cc b/rtc_base/memory_usage.cc
index 4284e4f597..2d33d98eed 100644
--- a/rtc_base/memory_usage.cc
+++ b/rtc_base/memory_usage.cc
@@ -22,6 +22,9 @@
 #include <windows.h>
 #include <psapi.h>  // must come after windows.h
 // clang-format on
+#elif defined(WEBRTC_FUCHSIA)
+#include <lib/zx/process.h>
+#include <zircon/status.h>
 #endif
 
 #include "rtc_base/logging.h"
@@ -61,8 +64,16 @@ int64_t GetProcessResidentSizeBytes() {
   }
   return pmc.WorkingSetSize;
 #elif defined(WEBRTC_FUCHSIA)
-  RTC_LOG_ERR(LS_ERROR) << "GetProcessResidentSizeBytes() not implemented";
-  return 0;
+  zx_info_task_stats_t task_stats;
+  zx_status_t status = zx::process::self()->get_info(
+      ZX_INFO_TASK_STATS, &task_stats, sizeof(task_stats), nullptr, nullptr);
+  if (status == ZX_OK) {
+    return task_stats.mem_mapped_bytes;
+  } else {
+    RTC_LOG_ERR(LS_ERROR) << "get_info() failed: "
+                          << zx_status_get_string(status);
+    return -1;
+  }
 #else
   // Not implemented yet.
   static_assert(false,