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a3187fe06c
Add a new member <nb_rhttp_conns> in thread_ctx structure. Its purpose is to count the current number of opened reverse HTTP connections regarding from their listeners membership. This patch will be useful to support multi-thread for active reverse HTTP, in order to select the less loaded thread. Note that despite access to <nb_rhttp_conns> are only done by the current thread, atomic operations are used. This is because once multi-thread support will be added, external threads will also retrieve values from others.
181 lines
8.3 KiB
C
181 lines
8.3 KiB
C
/*
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* include/haproxy/tinfo-t.h
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* Definitions of the thread_info structure.
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*
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* Copyright (C) 2020 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 _HAPROXY_TINFO_T_H
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#define _HAPROXY_TINFO_T_H
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#include <import/ebtree-t.h>
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#include <haproxy/api-t.h>
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#include <haproxy/freq_ctr-t.h>
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#include <haproxy/thread-t.h>
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/* forward declarations for types used below */
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struct buffer;
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/* Threads sets are known either by a set of absolute thread numbers, or by a
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* set of relative thread numbers within a group, for each group. The default
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* is the absolute mode and corresponds to the case where no group is known
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* (nbgrp == 0). The mode may only be changed when the set is empty (use
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* thread_set_is_empty() for this).
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*/
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struct thread_set {
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union {
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ulong abs[(MAX_THREADS + LONGBITS - 1) / LONGBITS];
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ulong rel[MAX_TGROUPS];
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};
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ulong grps; /* bit field of all non-empty groups, 0 for abs */
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};
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/* tasklet classes */
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enum {
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TL_URGENT = 0, /* urgent tasklets (I/O callbacks) */
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TL_NORMAL = 1, /* normal tasks */
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TL_BULK = 2, /* bulk task/tasklets, streaming I/Os */
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TL_HEAVY = 3, /* heavy computational tasklets (e.g. TLS handshakes) */
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TL_CLASSES /* must be last */
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};
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/* thread_ctx flags, for ha_thread_ctx[].flags. These flags describe the
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* thread's state and are visible to other threads, so they must be used
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* with atomic ops.
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*/
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#define TH_FL_STUCK 0x00000001
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#define TH_FL_TASK_PROFILING 0x00000002
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#define TH_FL_NOTIFIED 0x00000004 /* task was notified about the need to wake up */
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#define TH_FL_SLEEPING 0x00000008 /* thread won't check its task list before next wakeup */
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#define TH_FL_STARTED 0x00000010 /* set once the thread starts */
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#define TH_FL_IN_LOOP 0x00000020 /* set only inside the polling loop */
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/* Thread group information. This defines a base and a count of global thread
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* IDs which belong to it, and which can be looked up into thread_info/ctx. It
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* is set up during parsing and is stable during operation. Thread groups start
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* at 1 so tgroup[0] describes thread group 1.
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*/
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struct tgroup_info {
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ulong threads_enabled; /* mask of threads enabled in this group */
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uint base; /* first thread in this group */
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uint count; /* number of threads in this group */
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ulong tgid_bit; /* bit corresponding to the tgroup ID */
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/* pad to cache line (64B) */
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char __pad[0]; /* unused except to check remaining room */
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char __end[0] __attribute__((aligned(64)));
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};
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/* This structure describes the group-specific context (e.g. active threads
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* etc). It uses one cache line per thread to limit false sharing.
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*/
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struct tgroup_ctx {
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ulong threads_harmless; /* mask of threads that are not modifying anything */
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ulong threads_idle; /* mask of threads idling in the poller */
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ulong stopping_threads; /* mask of threads currently stopping */
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struct eb_root timers; /* wait queue (sorted timers tree, global, accessed under wq_lock) */
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uint niced_tasks; /* number of niced tasks in this group's run queues */
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/* pad to cache line (64B) */
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char __pad[0]; /* unused except to check remaining room */
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char __end[0] __attribute__((aligned(64)));
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};
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/* This structure describes all the per-thread info we need. When threads are
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* disabled, it contains the same info for the single running thread. This is
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* stable across all of a thread's life, and is being pointed to by the
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* thread-local "ti" pointer.
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*/
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struct thread_info {
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const struct tgroup_info *tg; /* config of the thread-group this thread belongs to */
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struct tgroup_ctx *tg_ctx; /* context of the thread-group this thread belongs to */
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uint tid, ltid; /* process-wide and group-wide thread ID (start at 0) */
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ulong ltid_bit; /* bit masks for the tid/ltid */
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uint tgid; /* ID of the thread group this thread belongs to (starts at 1; 0=unset) */
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/* 32-bit hole here */
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ullong pth_id; /* the pthread_t cast to a ullong */
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void *stack_top; /* the top of the stack when entering the thread */
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/* pad to cache line (64B) */
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char __pad[0]; /* unused except to check remaining room */
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char __end[0] __attribute__((aligned(64)));
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};
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/* This structure describes all the per-thread context we need. This is
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* essentially the scheduler-specific stuff and a few important per-thread
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* lists that need to be thread-local. We take care of splitting this into
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* separate cache lines.
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*/
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struct thread_ctx {
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// first and second cache lines on 64 bits: thread-local operations only.
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struct eb_root timers; /* tree constituting the per-thread wait queue */
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struct eb_root rqueue; /* tree constituting the per-thread run queue */
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struct task *current; /* current task (not tasklet) */
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int current_queue; /* points to current tasklet list being run, -1 if none */
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unsigned int nb_tasks; /* number of tasks allocated on this thread */
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uint8_t tl_class_mask; /* bit mask of non-empty tasklets classes */
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// 7 bytes hole here
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struct list pool_lru_head; /* oldest objects in thread-local pool caches */
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struct list buffer_wq; /* buffer waiters */
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struct list streams; /* list of streams attached to this thread */
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struct list quic_conns; /* list of active quic-conns attached to this thread */
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struct list quic_conns_clo; /* list of closing quic-conns attached to this thread */
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struct list queued_checks; /* checks waiting for a connection slot */
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unsigned int nb_rhttp_conns; /* count of current conns used for active reverse HTTP */
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ALWAYS_ALIGN(2*sizeof(void*));
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struct list tasklets[TL_CLASSES]; /* tasklets (and/or tasks) to run, by class */
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// third cache line here on 64 bits: accessed mostly using atomic ops
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ALWAYS_ALIGN(64);
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struct mt_list shared_tasklet_list; /* Tasklet to be run, woken up by other threads */
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unsigned int rqueue_ticks; /* Insertion counter for the run queue */
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unsigned int rq_total; /* total size of the run queue, prio_tree + tasklets */
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int tasks_in_list; /* Number of tasks in the per-thread tasklets list */
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uint idle_pct; /* idle to total ratio over last sample (percent) */
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uint flags; /* thread flags, TH_FL_*, atomic! */
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uint active_checks; /* number of active health checks on this thread, incl migrated */
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uint32_t sched_wake_date; /* current task/tasklet's wake date or 0 */
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uint32_t sched_call_date; /* current task/tasklet's call date (valid if sched_wake_date > 0) */
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struct sched_activity *sched_profile_entry; /* profile entry in use by the current task/tasklet, only if sched_wake_date>0 */
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uint64_t prev_cpu_time; /* previous per thread CPU time */
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uint64_t prev_mono_time; /* previous system wide monotonic time */
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struct eb_root rqueue_shared; /* run queue fed by other threads */
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__decl_thread(HA_SPINLOCK_T rqsh_lock); /* lock protecting the shared runqueue */
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struct freq_ctr out_32bps; /* #of 32-byte blocks emitted per second */
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uint running_checks; /* number of health checks currently running on this thread */
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unsigned long long out_bytes; /* total #of bytes emitted */
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unsigned long long spliced_out_bytes; /* total #of bytes emitted though a kernel pipe */
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struct buffer *thread_dump_buffer; /* NULL out of dump, valid during a dump, 0x01 once done */
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ALWAYS_ALIGN(128);
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};
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#endif /* _HAPROXY_TINFO_T_H */
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