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HAProxy - Load balancer
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Willy Tarreau 1e7bef17df MINOR: hlua: take the global Lua lock inside a global function 
Some users are facing huge CPU usage or even watchdog panics due to
the Lua global lock when many threads compete on it, but they have
no way to see that in the usual dumps. We take the lock at 2 or 3
places only, thus it's trivial to move it to a global function so
that stack dumps will now explicitly show it, increasing the change
that it rings a bell and someone suggests switch to lua-load-per-thread:

  Current executing Lua from a stream analyser -- stack traceback:
      loop.lua:1: in function line 1
  call trace(27):
  |       0x5ff157 [48 83 c4 10 5b 5d 41 5c]: wdt_handler+0xf7/0x104
  | 0x7fe37fe82690 [48 c7 c0 0f 00 00 00 0f]: libpthread:+0x13690
  |       0x614340 [66 48 0f 7e c9 48 01 c2]: main+0x1e8a40
  |       0x607b85 [48 83 c4 08 48 89 df 31]: main+0x1dc285
  |       0x6070bc [48 8b 44 24 20 48 8b 14]: main+0x1db7bc
  |       0x607d37 [41 89 c4 89 44 24 1c 83]: lua_resume+0xc7/0x214
  |       0x464ad6 [83 f8 06 0f 87 f1 01 00]: main+0x391d6
  |       0x4691a7 [83 f8 06 0f 87 03 20 fc]: main+0x3d8a7
  |       0x51dacb [85 c0 74 61 48 8b 5d 20]: sample_process+0x4b/0xf7
  |       0x51e55c [48 85 c0 74 3f 64 48 63]: sample_fetch_as_type+0x3c/0x9b
  |       0x525613 [48 89 c6 48 85 c0 0f 84]: sess_build_logline+0x2443/0x3cae
  |       0x4af0be [4c 63 e8 4c 03 6d 10 4c]: http_apply_redirect_rule+0xbfe/0xdf8
  |       0x4af523 [83 f8 01 19 c0 83 e0 03]: main+0x83c23
  |       0x4b2326 [83 f8 07 0f 87 99 00 00]: http_process_req_common+0xf6/0x15f6
  |       0x4d5b30 [85 c0 0f 85 9f f5 ff ff]: process_stream+0x2010/0x4e18

It also allows "perf top" to directly show the time spent on this lock.

This may be backported to some stable versions as it improves the
overall debuggability.
2021-08-20 17:33:26 +02:00
.github CI: github actions: relax OpenSSL-3.0.0 version comparision 2021-08-16 12:48:49 +02:00
addons BUILD: opentracing: fixed build when using pkg-config utility 2021-08-01 18:18:29 +02:00
admin ADMIN: dyncookie: implement a simple dynamic cookie calculator 2021-08-11 14:07:45 +02:00
dev CLEANUP: dev/flags: remove useless test in the stdin number parser 2021-04-03 15:29:10 +02:00
doc [RELEASE] Released version 2.5-dev4 2021-08-17 14:08:55 +02:00
examples MEDIUM: proxy: remove long-broken 'option http_proxy' 2021-07-18 19:35:32 +02:00
include MINOR: httpclient: cleanup the include files 2021-08-20 14:25:15 +02:00
reg-tests REGTESTS: server: fix agent-check syntax and expectation 2021-08-20 11:28:15 +02:00
scripts CI: ssl: keep the old method for ancient OpenSSL versions 2021-06-17 15:40:53 +02:00
src MINOR: hlua: take the global Lua lock inside a global function 2021-08-20 17:33:26 +02:00
tests CLEANUP: assorted typo fixes in the code and comments 2021-08-16 12:37:59 +02:00
.cirrus.yml CI: introduce scripts/build-vtest.sh for installing VTest 2021-05-18 10:48:30 +02:00
.gitattributes MINOR: Configure the cpp userdiff driver for *.[ch] in .gitattributes 2021-02-22 18:17:57 +01:00
.gitignore DOC: lua-api: Add documentation about lua filters 2021-08-15 20:56:44 +02:00
.travis.yml CI: travis-ci: temporarily disable arm64 builds 2021-08-07 07:28:15 +02:00
BRANCHES DOC: fix some spelling issues over multiple files 2021-01-08 14:53:47 +01:00
CHANGELOG [RELEASE] Released version 2.5-dev4 2021-08-17 14:08:55 +02:00
CONTRIBUTING CLEANUP: assorted typo fixes in the code and comments 2021-08-16 12:37:59 +02:00
INSTALL CLEANUP: assorted typo fixes in the code and comments 2021-08-16 12:37:59 +02:00
LICENSE LICENSE: add licence exception for OpenSSL 2012-09-07 13:52:26 +02:00
MAINTAINERS CONTRIB: move spoa_example out of the tree 2021-04-21 09:39:06 +02:00
Makefile MINOR: httpclient: initialize the proxy 2021-08-18 17:35:48 +02:00
README DOC: create a BRANCHES file to explain the life cycle 2019-06-15 22:00:14 +02:00
ROADMAP DOC: update the outdated ROADMAP file 2019-06-15 21:59:54 +02:00
SUBVERS BUILD: use format tags in VERDATE and SUBVERS files 2013-12-10 11:22:49 +01:00
VERDATE [RELEASE] Released version 2.5-dev4 2021-08-17 14:08:55 +02:00
VERSION [RELEASE] Released version 2.5-dev4 2021-08-17 14:08:55 +02:00

README 

The HAProxy documentation has been split into a number of different files for
ease of use.

Please refer to the following files depending on what you're looking for :

  - INSTALL for instructions on how to build and install HAProxy
  - BRANCHES to understand the project's life cycle and what version to use
  - LICENSE for the project's license
  - CONTRIBUTING for the process to follow to submit contributions

The more detailed documentation is located into the doc/ directory :

  - doc/intro.txt for a quick introduction on HAProxy
  - doc/configuration.txt for the configuration's reference manual
  - doc/lua.txt for the Lua's reference manual
  - doc/SPOE.txt for how to use the SPOE engine
  - doc/network-namespaces.txt for how to use network namespaces under Linux
  - doc/management.txt for the management guide
  - doc/regression-testing.txt for how to use the regression testing suite
  - doc/peers.txt for the peers protocol reference
  - doc/coding-style.txt for how to adopt HAProxy's coding style
  - doc/internals for developer-specific documentation (not all up to date)