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ircd::ctx: Sample rdtsc to complement profile warning output.

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This commit is contained in:
Jason Volk 2018-02-05 10:47:46 -08:00
parent 7b48bc9f40
commit 3ba527079b
2 changed files with 28 additions and 10 deletions
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3
configure.ac
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@ -452,6 +452,9 @@ RB_CHK_SYSHEADER(winsock2.h, [WINSOCK2_H])
RB_CHK_SYSHEADER(ws2tcpip.h, [WS2TCPIP_H])
RB_CHK_SYSHEADER(iphlpapi.h, [IPHLPAPI_H])
dnl x86 platform
RB_CHK_SYSHEADER(x86intrin.h, [X86INTRIN_H])
dnl experimental
RB_CHK_SYSHEADER(experimental/string_view, [EXPERIMENTAL_STRING_VIEW])
RB_CHK_SYSHEADER(experimental/optional, [EXPERIMENTAL_OPTIONAL])

35
ircd/ctx.cc
View file

@ -8,6 +8,7 @@
// copyright notice and this permission notice is present in all copies. The
// full license for this software is available in the LICENSE file.
#include <RB_INC_X86INTRIN_H
#include <ircd/asio.h>
/// Internal context implementation
@ -798,6 +799,7 @@ ircd::ctx::debug_stats(const pool &pool)
namespace ircd::ctx::prof
{
time_point cur_slice_start; // Time slice state
uint64_t cur_slice_rdtsc; // Time slice state
void check_stack();
void check_slice();
@ -860,32 +862,45 @@ ircd::ctx::prof::handle_cur_continue()
void
ircd::ctx::prof::slice_start()
{
cur_slice_rdtsc = __rdtsc();
cur_slice_start = steady_clock::now();
}
void
ircd::ctx::prof::check_slice()
{
auto &c(cur());
const uint64_t now_rdtsc(__rdtsc());
const uint64_t rdtsc_usage(now_rdtsc - cur_slice_rdtsc);
const auto time_usage(steady_clock::now() - cur_slice_start);
const auto now_sc(steady_clock::now());
const auto time_usage(now_sc - cur_slice_start);
auto &c(cur());
c.awake += duration_cast<microseconds>(time_usage);
if(unlikely(settings.slice_warning > 0us && time_usage >= settings.slice_warning))
{
log::warning("context timeslice exceeded (%p) '%s' last: %06ld$us total: %06ld$us",
(const void *)&c,
c.name,
duration_cast<microseconds>(time_usage).count(),
c.awake.count());
log::warning
{
"context timeslice exceeded '%s' (%lu) total: %06ld$us last: %lu$ns %lu$tsc",
name(c),
id(c),
c.awake.count(),
duration_cast<nanoseconds>(time_usage).count(),
rdtsc_usage
};
assert(settings.slice_assertion == 0us || time_usage < settings.slice_assertion);
}
if(unlikely(settings.slice_interrupt > 0us && time_usage >= settings.slice_interrupt))
throw interrupted("ctx(%p): Time slice exceeded (last: %06ld microseconds)",
(const void *)&c,
duration_cast<microseconds>(time_usage).count());
throw interrupted
{
"Time slice exceeded '%s' (%lu) (last: %06ld microseconds)",
name(c),
id(c),
duration_cast<microseconds>(time_usage).count()
};
}
void