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45 lines
1.4 KiB
C++
45 lines
1.4 KiB
C++
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#pragma once
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#include <sys/types.h>
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#include <boost/noncopyable.hpp>
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#if defined(__linux__)
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struct taskstats;
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namespace DB
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{
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/// Provides several essential per-task metrics by reading data from Procfs (when available).
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class ProcfsMetricsProvider : private boost::noncopyable
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{
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public:
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ProcfsMetricsProvider(const pid_t /*tid*/);
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~ProcfsMetricsProvider();
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/// Updates only a part of taskstats struct's fields:
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/// - cpu_run_virtual_total, cpu_delay_total (when /proc/thread-self/schedstat is available)
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/// - blkio_delay_total (when /proc/thread-self/stat is available)
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/// - rchar, wchar, read_bytes, write_bytes (when /prod/thread-self/io is available)
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/// See: man procfs
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void getTaskStats(::taskstats & out_stats) const;
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/// Tells whether this metrics (via Procfs) is provided on the current platform
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static bool isAvailable() noexcept;
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private:
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void readParseAndSetThreadCPUStat(::taskstats & out_stats, char *, size_t) const;
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void readParseAndSetThreadBlkIOStat(::taskstats & out_stats, char *, size_t) const;
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void readParseAndSetThreadIOStat(::taskstats & out_stats, char *, size_t) const;
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private:
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int thread_schedstat_fd = -1;
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int thread_stat_fd = -1;
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int thread_io_fd = -1;
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/// This field is used for compatibility with TasksStatsCounters::incrementProfileEvents()
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unsigned short stats_version = 1;
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};
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}
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#endif
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