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20dc3cd4a6
The LRU cache head was an array of list, which causes false sharing between 4 to 8 threads in the same cache line. Let's move it to the thread_info structure instead. There's no need to do the same for the pool_cache[] array since it's already quite large (32 pointers each). By doing this the request rate increased by 1% on a 16-thread machine.
54 lines
1.9 KiB
C
54 lines
1.9 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 <time.h>
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#include <haproxy/api-t.h>
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#include <haproxy/pool-t.h>
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/* thread info flags, for ha_thread_info[].flags */
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#define TI_FL_STUCK 0x00000001
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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 (except
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* the pthread identifier which does not exist).
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*/
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struct thread_info {
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__decl_thread(pthread_t pthread);
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clockid_t clock_id;
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timer_t wd_timer; /* valid timer or TIMER_INVALID if not set */
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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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unsigned int idle_pct; /* idle to total ratio over last sample (percent) */
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unsigned int flags; /* thread info flags, TI_FL_* */
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#ifdef CONFIG_HAP_LOCAL_POOLS
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struct list pool_lru_head; /* oldest objects */
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#endif
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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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#endif /* _HAPROXY_TINFO_T_H */
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