mirror of
https://github.com/matrix-construct/construct
synced 2024-07-03 01:09:05 +02:00
78 lines
3.1 KiB
C++
78 lines
3.1 KiB
C++
/*
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* charybdis: oh just a little chat server
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*
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* Copyright (C) 2016 Charybdis Development Team
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* Copyright (C) 2016 Jason Volk <jason@zemos.net>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice is present in all copies.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#define HAVE_IRCD_CTX_PROF_H
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namespace ircd::ctx
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{
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size_t stack_usage_here(const ctx &) __attribute__((noinline));
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size_t stack_usage_here() __attribute__((noinline));
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}
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/// Profiling for the context system.
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///
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/// These facilities provide tools and statistics. The primary purpose here is
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/// to alert developers of unwanted context behavior, in addition to optimizing
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/// the overall performance of the context system.
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///
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/// The original use case is for the embedded database backend. Function calls
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/// are made which may conduct blocking I/O before returning. This will hang the
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/// current userspace context while it is running and thus BLOCK EVERY CONTEXT
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/// in the entire IRCd. Since this is still an asynchronous system, it just
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/// doesn't have callbacks: we do not do I/O without a cooperative yield.
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/// Fortunately there are mechanisms to mitigate this -- but we have to know
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/// for sure. A database call which has been passed over for mitigation may
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/// start doing some blocking flush under load, etc. The profiler will alert
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/// us of this so it doesn't silently degrade performance.
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///
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namespace ircd::ctx::prof
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{
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enum class event;
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struct settings extern settings;
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void mark(const event &);
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}
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enum class ircd::ctx::prof::event
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{
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SPAWN, // Context spawn requested
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JOIN, // Context join requested
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JOINED, // Context join completed
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CUR_ENTER, // Current context entered
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CUR_LEAVE, // Current context leaving
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CUR_YIELD, // Current context yielding
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CUR_CONTINUE, // Current context continuing
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CUR_INTERRUPT, // Current context detects interruption
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};
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struct ircd::ctx::prof::settings
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{
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double stack_usage_warning; // percentage
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double stack_usage_assertion; // percentage
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microseconds slice_warning; // Warn when the yield-to-yield time exceeds
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microseconds slice_interrupt; // Interrupt exception when exceeded (not a signal)
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microseconds slice_assertion; // abort() when exceeded (not a signal, must yield)
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};
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