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5d350d1e50
Given that the original list-based version was using a list head as the root of the variables, while the tree is using a single pointer, it made sense to reuse that space to place multiple roots, indexed on the lower bits of the name hash. Two roots slightly increase the performance level, but the best gain is obtained with 4 roots. The performance is now always above that of the list, even with small counts, and with 100 vars, it's 21% higher than before, or 67% higher than with the list. We keep the same lock (it could have made sense to use one lock per head), because most of the variables in large configs are attached to a stream or a session, hence are not shared between threads. Thus there's no point in sharding the pointer.
77 lines
2.6 KiB
C
77 lines
2.6 KiB
C
/*
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* include/haproxy/vars-t.h
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* Macros and structures definitions for variables.
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*
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* Copyright (C) 2015 Thierry FOURNIER <tfournier@arpalert.org>
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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_VARS_T_H
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#define _HAPROXY_VARS_T_H
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#include <haproxy/sample_data-t.h>
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#include <haproxy/thread-t.h>
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#include <import/cebtree.h>
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/* flags used when setting/clearing variables */
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#define VF_CREATEONLY 0x00000001 // do nothing if the variable already exists
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#define VF_PERMANENT 0x00000002 // variables known to the config parser
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#define VF_COND_IFEXISTS 0x00000004 // only set variable if it already exists
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#define VF_COND_IFNOTEXISTS 0x00000008 // only set variable if it did not exist yet
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#define VF_COND_IFEMPTY 0x00000010 // only set variable if sample is empty
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#define VF_COND_IFNOTEMPTY 0x00000020 // only set variable if sample is not empty
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#define VF_COND_IFSET 0x00000040 // only set variable if its type is not SMP_TYPE_ANY
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#define VF_COND_IFNOTSET 0x00000080 // only set variable if its type is ANY
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#define VF_COND_IFGT 0x00000100 // only set variable if its value is greater than the sample's
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#define VF_COND_IFLT 0x00000200 // only set variable if its value is less than the sample's
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enum vars_scope {
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SCOPE_SESS = 0,
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SCOPE_TXN,
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SCOPE_REQ,
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SCOPE_RES,
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SCOPE_PROC,
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SCOPE_CHECK,
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};
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#define VAR_NAME_ROOTS 4
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struct vars {
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struct ceb_node *name_root[VAR_NAME_ROOTS];
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enum vars_scope scope;
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unsigned int size;
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__decl_thread(HA_RWLOCK_T rwlock);
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};
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#define VDF_PARENT_CTX 0x00000001 // Set if the variable is related to the parent stream
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/* This struct describes a variable as found in an arg_data */
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struct var_desc {
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uint64_t name_hash;
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enum vars_scope scope;
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uint flags; /*VDF_* */
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};
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struct var {
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struct ceb_node node; /* Used for chaining vars. */
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uint64_t name_hash; /* XXH3() of the variable's name, must be just after node */
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uint flags; // VF_*
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/* 32-bit hole here */
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struct sample_data data; /* data storage. */
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};
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#endif
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