Basic process mem usage functions

CMakeLists.txt

@@ -82,7 +82,10 @@ if (WIN32)
     endif ()
 
     list(APPEND PLATFORM_DEFINES WINDOWS_KERNEL_LIB=${WINDOWS_KERNEL_LIB})
-    list(APPEND PLATFORM_LIBS BCrypt ${WINDOWS_KERNEL_LIB} Ws2_32 Shlwapi)
+    # PSAPI_VERSION=1 is needed to support GetProcessMemoryInfo on both pre and
+    # post Win7 OS's. 
+    list(APPEND PLATFORM_DEFINES PSAPI_VERSION=1)
+    list(APPEND PLATFORM_LIBS BCrypt ${WINDOWS_KERNEL_LIB} Ws2_32 Shlwapi Psapi)
 else ()
     file(GLOB AWS_COMMON_OS_HEADERS
         "include/aws/common/posix/*"

include/aws/common/system_resource_util.h

@@ -0,0 +1,30 @@
+#ifndef AWS_COMMON_SYSTEM_RESOURCE_UTIL_H
+#define AWS_COMMON_SYSTEM_RESOURCE_UTIL_H
+
+/**
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+#include <aws/common/common.h>
+
+AWS_PUSH_SANE_WARNING_LEVEL
+
+AWS_EXTERN_C_BEGIN
+
+struct aws_memory_usage_stats {
+    size_t maxrss;      /* max resident set size in kilobytes since program start */
+    size_t page_faults; /* num of page faults since program start */
+
+    size_t _reserved[8];
+};
+
+/*
+ * Get memory usage for current process.
+ * Raises AWS_ERROR_SYS_CALL_FAILURE on failure.
+ */
+AWS_COMMON_API int aws_init_memory_usage_for_current_process(struct aws_memory_usage_stats *memory_usage);
+
+AWS_EXTERN_C_END
+AWS_POP_SANE_WARNING_LEVEL
+
+#endif /* AWS_COMMON_SYSTEM_RESOURCE_UTIL_H */

source/posix/system_resource_utils.c

@@ -0,0 +1,32 @@
+/**
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+
+#include <aws/common/system_resource_util.h>
+
+#include <sys/resource.h>
+
+int aws_init_memory_usage_for_current_process(struct aws_memory_usage_stats *memory_usage) {
+    AWS_PRECONDITION(memory_usage);
+
+    AWS_ZERO_STRUCT(*memory_usage);
+    struct rusage usage;
+
+    if (getrusage(RUSAGE_SELF, &usage)) {
+        return aws_raise_error(AWS_ERROR_SYS_CALL_FAILURE);
+    }
+
+#if defined(AWS_OS_APPLE)
+    /*
+     * For some reason Apple switched to reporting this in bytes instead of KB
+     * around MacOS 10.6.
+     * Make it back to KB. Result might be slightly off due to rounding.
+     */
+    memory_usage->maxrss = usage.ru_maxrss / 1024;
+#else
+    memory_usage->maxrss = usage.ru_maxrss;
+#endif
+    memory_usage->page_faults = usage.ru_majflt;
+    return AWS_OP_SUCCESS;
+}

source/windows/system_resource_utils.c

@@ -0,0 +1,31 @@
+/**
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+
+#include <aws/common/system_resource_util.h>
+
+#include <windows.h>
+
+#include <psapi.h>
+
+int aws_init_memory_usage_for_current_process(struct aws_memory_usage_stats *memory_usage) {
+    AWS_PRECONDITION(memory_usage);
+
+    AWS_ZERO_STRUCT(*memory_usage);
+    HANDLE hProcess = GetCurrentProcess();
+
+    PROCESS_MEMORY_COUNTERS pmc;
+
+    BOOL ret = GetProcessMemoryInfo(hProcess, &pmc, sizeof(pmc));
+    CloseHandle(hProcess);
+
+    if (!ret) {
+        return aws_raise_error(AWS_ERROR_SYS_CALL_FAILURE);
+    }
+
+    memory_usage->maxrss = pmc.PeakWorkingSetSize;
+    memory_usage->page_faults = pmc.PageFaultCount;
+
+    return AWS_OP_SUCCESS;
+}

tests/CMakeLists.txt

@@ -402,6 +402,8 @@ add_test_case(ring_buffer_acquire_up_to_multi_threaded_test)
 add_test_case(string_to_log_level_success_test)
 add_test_case(string_to_log_level_failure_test)
 
+add_test_case(test_memory_usage_maxrss)
+
 if(NOT ANDROID)
     add_test_case(test_logging_filter_at_AWS_LL_NONE_s_logf_all_levels)
     add_test_case(test_logging_filter_at_AWS_LL_FATAL_s_logf_all_levels)

tests/system_resource_util_test.c

@@ -0,0 +1,22 @@
+/**
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+
+#include <aws/common/system_resource_util.h>
+
+#include <aws/testing/aws_test_harness.h>
+
+static int s_test_memory_usage_maxrss(struct aws_allocator *allocator, void *ctx) {
+    (void)allocator;
+    (void)ctx;
+
+    struct aws_memory_usage_stats mu;
+    ASSERT_SUCCESS(aws_init_memory_usage_for_current_process(&mu));
+
+    ASSERT_TRUE(mu.maxrss > 0);
+
+    return 0;
+}
+
+AWS_TEST_CASE(test_memory_usage_maxrss, s_test_memory_usage_maxrss)