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08c6bbb542
If we see that another thread is already busy trying to announce the dropped counter, there's no point going there, so let's just skip all that operation from sink_write() and avoid disturbing the other thread. This results in a boost from 244 to 262k req/s.
92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
/*
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* include/haproxy/sink.h
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* This file provides declarations for event sinks management
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*
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* Copyright (C) 2000-2019 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_SINK_H
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#define _HAPROXY_SINK_H
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#include <sys/types.h>
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#include <haproxy/sink-t.h>
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#include <haproxy/thread.h>
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extern struct list sink_list;
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extern struct proxy *sink_proxies_list;
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struct sink *sink_find(const char *name);
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struct sink *sink_find_early(const char *name, const char *from, const char *file, int line);
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struct sink *sink_new_fd(const char *name, const char *desc, enum log_fmt, int fd);
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ssize_t __sink_write(struct sink *sink, struct log_header hdr, size_t maxlen,
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const struct ist msg[], size_t nmsg);
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int sink_announce_dropped(struct sink *sink, struct log_header hdr);
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/* tries to send <nmsg> message parts from message array <msg> to sink <sink>.
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* Formatting according to the sink's preference is done here, unless sink->fmt
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* is unspecified, in which case the caller formatting will be used instead.
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*
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* It will stop writing at <maxlen> instead of sink->maxlen if <maxlen> is
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* positive and inferior to sink->maxlen.
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*
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* Lost messages are accounted for in the sink's counter. If there
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* were lost messages, an attempt is first made to indicate it.
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* The function returns the number of Bytes effectively sent or announced.
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* or <= 0 in other cases.
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*/
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static inline ssize_t sink_write(struct sink *sink, struct log_header hdr,
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size_t maxlen, const struct ist msg[], size_t nmsg)
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{
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ssize_t sent = 0;
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uint dropped = HA_ATOMIC_LOAD(&sink->ctx.dropped);
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if (unlikely(dropped > 0)) {
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if (dropped & 1) // another thread on it.
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goto fail;
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sent = sink_announce_dropped(sink, hdr);
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if (!sent) {
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/* we failed, we don't try to send our log as if it
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* would pass by chance, we'd get disordered events.
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*/
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goto fail;
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}
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}
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sent = __sink_write(sink, hdr, maxlen, msg, nmsg);
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fail:
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if (unlikely(sent <= 0))
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HA_ATOMIC_ADD(&sink->ctx.dropped, 2);
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return sent;
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}
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struct sink *sink_new_from_srv(struct server *srv, const char *from);
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int sink_resolve_logger_buffer(struct logger *logger, char **msg);
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#endif /* _HAPROXY_SINK_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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