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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/vespalib/stllike/string.h>
namespace vespalib {
/*
* Class for linux specific way to get memory stats for current process.
*/
class ProcessMemoryStats
{
uint64_t _mapped_virt; // virtual size
uint64_t _mapped_rss; // resident size
uint64_t _anonymous_virt; // virtual size
uint64_t _anonymous_rss; // resident size
uint64_t _mappings_count; // number of mappings
// (limited by sysctl vm.max_map_count)
static ProcessMemoryStats createStatsFromSmaps();
public:
ProcessMemoryStats();
/**
* Sample memory stats for the current process based on reading the file /proc/self/smaps.
*
* Samples are taken until two consecutive memory stats are similar given the size epsilon.
* This ensures a somewhat consistent memory stats snapshot.
*/
static ProcessMemoryStats create(uint64_t sizeEpsilon = 1 * 1024 * 1024);
uint64_t getMappedVirt() const { return _mapped_virt; }
uint64_t getMappedRss() const { return _mapped_rss; }
uint64_t getAnonymousVirt() const { return _anonymous_virt; }
uint64_t getAnonymousRss() const { return _anonymous_rss; }
uint64_t getMappingsCount() const { return _mappings_count; }
bool similarTo(const ProcessMemoryStats &rhs, uint64_t sizeEpsilon) const;
vespalib::string toString() const;
bool operator < (const ProcessMemoryStats & rhs) const { return _anonymous_rss < rhs._anonymous_rss; }
/** for unit tests only */
ProcessMemoryStats(uint64_t, uint64_t, uint64_t, uint64_t, uint64_t);
};
}
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