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ircd::prof: Add a syscall_timer device.

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This commit is contained in:
Jason Volk 2019-04-10 14:49:39 -07:00
parent b45306a012
commit 565d6e8381
1 changed files with 30 additions and 0 deletions
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30
include/ircd/prof.h
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@ -19,6 +19,7 @@ namespace ircd::prof
struct times;
struct system;
struct resource;
struct syscall_timer;
enum dpl :uint8_t;
enum counter :uint8_t;
enum cacheop :uint8_t;
@ -74,6 +75,35 @@ struct ircd::prof::times
times() = default;
};
/// This device intends to figure out when a system call is really slow
/// or "blocking." The original use-case is for io_submit() in fs::aio.
/// The sample is conducted with times(2) which is itself a system call,
/// and the result has poor resolution meaning the result of at() is
/// generally 0 unless the system call was actually slow.
struct ircd::prof::syscall_timer
{
uint64_t started
{
time_kern()
};
uint64_t stopped
{
0
};
uint64_t at() const
{
return stopped - started;
}
uint64_t stop()
{
stopped = time_kern();
return at();
}
};
struct ircd::prof::resource
:std::array<uint64_t, 9>
{