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1efddfa6bf
The profile entry that corresponds to the current task/tasklet being profiled is now stored into the thread's context. This will allow it to be accessed from the tasks themselves. This is needed for an upcoming fix.
147 lines
6.6 KiB
C
147 lines
6.6 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/thread-t.h>
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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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/* 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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HA_RWLOCK_T wq_lock; /* RW lock related to the wait queue below */
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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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/* 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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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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/* 32-bit hole here */
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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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ALWAYS_ALIGN(128);
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};
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#endif /* _HAPROXY_TINFO_T_H */
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