mirror of
https://github.com/matrix-construct/construct
synced 2024-11-09 11:31:11 +01:00
73 lines
3.1 KiB
C++
73 lines
3.1 KiB
C++
/*
|
|
* charybdis: oh just a little chat server
|
|
*
|
|
* Copyright (C) 2016 Charybdis Development Team
|
|
* Copyright (C) 2016 Jason Volk <jason@zemos.net>
|
|
*
|
|
* Permission to use, copy, modify, and/or distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice is present in all copies.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
|
|
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
|
|
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#pragma once
|
|
#define HAVE_IRCD_CTX_PROF_H
|
|
|
|
namespace ircd::ctx
|
|
{
|
|
size_t stack_usage_here(const ctx &) __attribute__((noinline));
|
|
size_t stack_usage_here() __attribute__((noinline));
|
|
}
|
|
|
|
/* Profiling for the context system. These facilities provide tools and statistics.
|
|
* The primary purpose here is to alert developers of unwanted context behavior, in
|
|
* addition to optimizing the overall performance of the context system.
|
|
*
|
|
* The original use case is for the embedded database backend. Function calls are made which may
|
|
* conduct blocking I/O before returning. This will hang the current userspace context while it
|
|
* is running and thus BLOCK EVERY CONTEXT in the entire IRCd. Since this is still an asynchronous
|
|
* system, it just doesn't have callbacks: we do not do I/O without a cooperative yield.
|
|
* Fortunately there are mechanisms to mitigate this -- but we have to know for sure. A database
|
|
* call which has been passed over for mitigation may start doing some blocking flush under load,
|
|
* etc. The profiler will alert us of this so it doesn't silently degrade performance.
|
|
*/
|
|
namespace ircd::ctx::prof
|
|
{
|
|
enum class event;
|
|
struct settings extern settings;
|
|
|
|
void mark(const event &);
|
|
}
|
|
|
|
enum class ircd::ctx::prof::event
|
|
{
|
|
SPAWN, // Context spawn requested
|
|
JOIN, // Context join requested
|
|
JOINED, // Context join completed
|
|
CUR_ENTER, // Current context entered
|
|
CUR_LEAVE, // Current context leaving
|
|
CUR_YIELD, // Current context yielding
|
|
CUR_CONTINUE, // Current context continuing
|
|
CUR_INTERRUPT, // Current context detects interruption
|
|
};
|
|
|
|
struct ircd::ctx::prof::settings
|
|
{
|
|
double stack_usage_warning; // percentage
|
|
double stack_usage_assertion; // percentage
|
|
|
|
microseconds slice_warning; // Warn when the yield-to-yield time exceeds
|
|
microseconds slice_interrupt; // Interrupt exception when exceeded (not a signal)
|
|
microseconds slice_assertion; // abort() when exceeded (not a signal, must yield)
|
|
};
|