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Since we know the time it takes to process everything between two poll() calls, we can use this as the max latency measurement any task will experience and average it. This code does this, and reports in "show activity" the average of this loop time over the last 1024 poll() loops, for each thread. It will vary quickly at high loads and slowly under low to moderate loads, depending on the rate at which poll() is called. The latency a task experiences is expected to be half of this on average.
65 lines
2.9 KiB
C
65 lines
2.9 KiB
C
/*
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* include/types/activity.h
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* This file contains structure declarations for activity measurements.
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*
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* Copyright (C) 2000-2018 Willy Tarreau - w@1wt.eu
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation, version 2.1
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* exclusively.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _TYPES_ACTIVITY_H
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#define _TYPES_ACTIVITY_H
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#include <common/config.h>
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#include <types/freq_ctr.h>
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/* per-thread activity reports. It's important that it's aligned on cache lines
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* because some elements will be updated very often. Most counters are OK on
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* 32-bit since this will be used during debugging sessions for troubleshooting
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* in iterative mode.
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*/
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struct activity {
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unsigned int loops; // complete loops in run_poll_loop()
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unsigned int wake_cache; // active fd_cache prevented poll() from sleeping
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unsigned int wake_tasks; // active tasks prevented poll() from sleeping
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unsigned int wake_signal; // pending signal prevented poll() from sleeping
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unsigned int poll_exp; // number of times poll() sees an expired timeout (includes wake_*)
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unsigned int poll_drop; // poller dropped a dead FD from the update list
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unsigned int poll_dead; // poller woke up with a dead FD
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unsigned int poll_skip; // poller skipped another thread's FD
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unsigned int fd_skip; // fd cache skipped another thread's FD
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unsigned int fd_lock; // fd cache skipped a locked FD
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unsigned int fd_del; // fd cache detected a deleted FD
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unsigned int conn_dead; // conn_fd_handler woke up on an FD indicating a dead connection
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unsigned int stream; // calls to process_stream()
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unsigned int empty_rq; // calls to process_runnable_tasks() with nothing for the thread
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unsigned int long_rq; // process_runnable_tasks() left with tasks in the run queue
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unsigned int cpust_total; // sum of half-ms stolen per thread
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/* one cache line */
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struct freq_ctr cpust_1s; // avg amount of half-ms stolen over last second
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struct freq_ctr_period cpust_15s; // avg amount of half-ms stolen over last 15s
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unsigned int avg_loop_us; // average run time per loop over last 1024 runs
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char __pad[0]; // unused except to check remaining room
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char __end[0] __attribute__((aligned(64))); // align size to 64.
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};
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#endif /* _TYPES_ACTIVITY_H */
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/*
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* Local variables:
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* c-indent-level: 8
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* c-basic-offset: 8
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* End:
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*/
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