Mirrors/criu
1
0
Fork 0
mirror of https://github.com/checkpoint-restore/criu.git synced 2026-01-23 02:14:37 +00:00
Code Issues Projects Releases Wiki Activity
No description
7621 commits 13 branches 71 tags 73 MiB
Find a file
Kir Kolyshkin 8ea0ba7dd0 string.h: fix memset over-optimization with clang 
We found a weird case of parasite code dying of SIGSEGV when clang
is used as a compiler (see [1] for more details).

Apparently, it was caused by clang optimizing our builtin_memset()
by inserting a call to memset(). It is a valid compiler optimization,
aside from the fact that in our code memset() is defined as a weak
alias to builtin_memset(), which of course lead to infinite recursion
and stack growth.

This might be a bug in compiler, but there are ways to avoid it:

1. Rewrite builtin_memset() in asm (note it needs to be done
   for every architecture supported).
2. Disable compiler optimizations for this code (say, by using -O0).
3. Declare the pointer inside builtin_memcpy() as volatile.

The last approach looks more appealing -- mostly for being simple.

[1] https://github.com/xemul/criu/issues/279

travis-ci: success for string.h: fix memset over-optimization with clang
Cc: Andrei Vagin <avagin@virtuozzo.com>
Cc: Dmitry Safonov <dsafonov@virtuozzo.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
2017-02-03 18:04:22 +03:00
contrib scripts/install-debian-packages: add libnet-dev 2017-01-16 11:04:49 +03:00
coredump coredump: Rename dir to coredump 2016-06-28 13:04:58 +03:00
crit crit/decode: set default opts['nopl'] to False 2016-05-30 13:47:54 +03:00
criu string.h: fix memset over-optimization with clang 2017-02-03 18:04:22 +03:00
Documentation crtools: close a signal descriptor after passing a preparation stage 2017-02-03 16:55:07 +03:00
images Add --weak_sysctl CLI option to RPC and lib 2016-12-05 23:34:54 +03:00
include/common scm: Allow to pass flags argument to recv_fds() 2017-02-03 18:04:22 +03:00
lib py: Fix resp.errno access 2016-12-21 11:23:02 +03:00
scripts zdtm: check sequence numbers for tcp sockets 2017-01-16 11:04:49 +03:00
soccr soccr: add one more test to check libsoccr_save/libsoccr_restore 2017-02-01 18:41:29 +03:00
test test: check exit codes for criu page-server 2017-02-03 18:04:17 +03:00
.gitignore soccr: Generate config.h dynamically 2017-01-16 11:03:42 +03:00
.mailmap repo: Add mailmap file 2012-03-25 23:31:20 +04:00
.travis.yml travis: enable arm/arm64/ppc builds with clang 2016-12-05 11:49:19 +03:00
COPYING COPYING: fix a typo in a preamble 2016-08-11 16:18:43 +03:00
CREDITS Add the CREDITS file 2012-07-30 13:52:37 +04:00
INSTALL.md Makefile.install: DESTDIR should be empty 2016-12-21 11:23:02 +03:00
Makefile build: only generate soccr config.h if necessary 2017-01-16 11:03:42 +03:00
Makefile.config make: Add .config file processing (v3) 2016-11-03 20:49:13 +03:00
Makefile.install Makefile.install: DESTDIR should be empty 2016-12-21 11:23:02 +03:00
Makefile.versions criu: Version 2.10 2017-01-16 12:06:01 +03:00
README.md Add ascciinema tour on basic criu features. 2016-06-16 16:37:06 +03:00

README.md

CRIU (Checkpoint and Restore in Userspace)

An utility to checkpoint/restore tasks. Using this tool, you can freeze a running application (or part of it) and checkpoint it to a hard drive as a collection of files. You can then use the files to restore and run the application from the point it was frozen at. The distinctive feature of the CRIU project is that it is mainly implemented in user space.

The project home is at http://criu.org.

Pages worth starting with are:

A video tour on basic CRIU features

CRIU introduction

How to contribute