mirror of
https://github.com/ClickHouse/ClickHouse.git
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91 lines
1.9 KiB
C++
91 lines
1.9 KiB
C++
#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <cassert>
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#include "MemoryStatisticsOS.h"
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#include <Common/Exception.h>
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#include <IO/ReadBufferFromMemory.h>
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#include <IO/ReadHelpers.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int FILE_DOESNT_EXIST;
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extern const int CANNOT_OPEN_FILE;
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extern const int CANNOT_READ_FROM_FILE_DESCRIPTOR;
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}
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static constexpr auto filename = "/proc/self/statm";
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static constexpr size_t PAGE_SIZE = 4096;
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MemoryStatisticsOS::MemoryStatisticsOS()
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{
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fd = ::open(filename, O_RDONLY | O_CLOEXEC);
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if (-1 == fd)
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throwFromErrno("Cannot open file " + std::string(filename), errno == ENOENT ? ErrorCodes::FILE_DOESNT_EXIST : ErrorCodes::CANNOT_OPEN_FILE);
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}
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MemoryStatisticsOS::~MemoryStatisticsOS()
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{
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if (0 != ::close(fd))
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tryLogCurrentException(__PRETTY_FUNCTION__);
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}
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MemoryStatisticsOS::Data MemoryStatisticsOS::get() const
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{
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Data data;
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constexpr size_t buf_size = 1024;
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char buf[buf_size];
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ssize_t res = 0;
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do
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{
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res = ::pread(fd, buf, buf_size, 0);
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if (-1 == res)
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{
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if (errno == EINTR)
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continue;
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throwFromErrno("Cannot read from file " + std::string(filename), ErrorCodes::CANNOT_READ_FROM_FILE_DESCRIPTOR);
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}
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assert(res >= 0);
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break;
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} while (true);
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ReadBufferFromMemory in(buf, res);
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uint64_t unused;
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readIntText(data.virt, in);
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skipWhitespaceIfAny(in);
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readIntText(data.resident, in);
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skipWhitespaceIfAny(in);
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readIntText(data.shared, in);
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skipWhitespaceIfAny(in);
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readIntText(data.code, in);
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skipWhitespaceIfAny(in);
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readIntText(unused, in);
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skipWhitespaceIfAny(in);
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readIntText(data.data_and_stack, in);
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data.virt *= PAGE_SIZE;
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data.resident *= PAGE_SIZE;
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data.shared *= PAGE_SIZE;
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data.code *= PAGE_SIZE;
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data.data_and_stack *= PAGE_SIZE;
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return data;
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}
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}
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