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c24de077bd
Following commit 75e480d10 ("MEDIUM: stats: avoid 1 indirection by storing
the shared stats directly in counters struct"), in order to minimize the
impact of the recent sharded counters work, we try to push things a bit
further in this patch by storing and using "fast" pointers at the session
and stream levels when available to avoid costly indirections and
systematic "tgid" resolution (which can not be cached by the CPU due to
its THREAD-local nature).
Indeed, we know that a session/stream is tied to a given CPU, thanks to
this we know that the tgid for a given session/stream will never change.
Given that, we are able to store sharded frontend and listener counters
pointer at the session level (namely sess->fe_tgcounters and
sess->li_tgcounters), and once the backend and the server are selected,
we are also able to store backend and server sharded counters
pointer at the stream level (namely s->be_tgcounters and s->sv_tgcounters)
Everywhere we rely on these counters and the stream or session context is
available, we use the fast pointers it instead of the indirect pointers
path to make the pointer resolution a bit faster.
This optimization proved to bring a few percents back, and together with
the previous 75e480d10 commit we now fixed the performance regression (we
are back to back with 3.2 stats performance)
90 lines
3.5 KiB
C
90 lines
3.5 KiB
C
/*
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* include/haproxy/session-t.h
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* This file defines everything related to sessions.
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*
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* Copyright (C) 2000-2020 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_SESSION_T_H
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#define _HAPROXY_SESSION_T_H
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#include <sys/time.h>
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#include <unistd.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <haproxy/api-t.h>
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#include <haproxy/obj_type-t.h>
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#include <haproxy/stick_table-t.h>
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#include <haproxy/task-t.h>
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#include <haproxy/vars-t.h>
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/* session flags */
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enum {
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SESS_FL_NONE = 0x00000000, /* nothing */
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SESS_FL_PREFER_LAST = 0x00000001, /* NTML authent, we should reuse last conn */
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SESS_FL_RELEASE_LI = 0x00000002, /* session responsible to decrement listener counters on release */
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};
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/* max number of idle server connections kept attached to a session */
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#define MAX_SRV_LIST 5
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struct session {
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struct proxy *fe; /* the proxy this session depends on for the client side */
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struct listener *listener; /* the listener by which the request arrived */
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enum obj_type *origin; /* the connection / applet which initiated this session */
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struct timeval accept_date; /* date of the session's accept() in user date */
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ullong accept_ts; /* date of the session's accept() in internal date (monotonic) */
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struct stkctr *stkctr; /* stick counters for tcp-connection */
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struct vars vars; /* list of variables for the session scope. */
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struct task *task; /* handshake timeout processing */
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long t_handshake; /* handshake duration, -1 = not completed */
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long t_idle; /* idle duration, -1 if never occurs */
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int idle_conns; /* Number of connections we're currently responsible for that we are not using */
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unsigned int flags; /* session flags, SESS_FL_* */
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struct list priv_conns; /* list of private conns */
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struct sockaddr_storage *src; /* source address (pool), when known, otherwise NULL */
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struct sockaddr_storage *dst; /* destination address (pool), when known, otherwise NULL */
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struct fe_counters_shared_tg *fe_tgcounters; /* pointer to current thread group shared frontend counters */
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struct fe_counters_shared_tg *li_tgcounters; /* pointer to current thread group shared listener counters */
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};
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/*
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* List of private conns managed by a session, indexed by server
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* Stored both into the session and server instances
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*/
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struct sess_priv_conns {
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void *target; /* Server or dispatch used for indexing */
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struct list conn_list; /* Head of the connections list */
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struct list sess_el; /* Element of session.priv_conns */
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struct mt_list srv_el; /* Element of server.sess_conns */
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int tid;
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};
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#endif /* _HAPROXY_SESSION_T_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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