Message ID | 20171113213117.5587-1-avagin@openvz.org |
---|---|
State | New |
Series | "Increate a limit for opened files for criu pre-dump and page-server" |
Headers | show
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X-MS-Exchange-CrossPremises-Processed-By-Journaling: Journal Agent X-OrganizationHeadersPreserved: HE1PR08MB0748.eurprd08.prod.outlook.com Cc: Cyrill Gorcunov <gorcunov@gmail.com>, Pavel Vokhmyanin <pvokhmyanin@virtuozzo.com> Subject: [Devel] [PATCH p.haul] Increate a limit for opened files for criu pre-dump and page-server X-BeenThere: devel@openvz.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: OpenVZ development <devel.openvz.org> List-Unsubscribe: <https://lists.openvz.org/mailman/options/devel>, <mailto:devel-request@openvz.org?subject=unsubscribe> List-Archive: <http://lists.openvz.org/pipermail/devel/> List-Post: <mailto:devel@openvz.org> List-Help: <mailto:devel-request@openvz.org?subject=help> List-Subscribe: <https://lists.openvz.org/mailman/listinfo/devel>, <mailto:devel-request@openvz.org?subject=subscribe> Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: devel-bounces@openvz.org Errors-To: devel-bounces@openvz.org |
diff --git a/phaul/criu_api.py b/phaul/criu_api.py index 73c642a..4627d5f 100644 --- a/phaul/criu_api.py +++ b/phaul/criu_api.py @@ -9,6 +9,7 @@ import re import socket import subprocess import util +import resource import pycriu @@ -36,9 +37,16 @@ class criu_conn(object): util.set_cloexec(css[1]) logging.info("Passing (ctl:%d, data:%d) pair to CRIU", css[0].fileno(), mem_sk.fileno()) + + # criu uses a lot of pipes to pre-dump memory, so we need to + # increate a limit for opened files. + fileno_max = int(open("/proc/sys/fs/nr_open").read()) + fileno_old = resource.getrlimit(resource.RLIMIT_NOFILE) + resource.setrlimit(resource.RLIMIT_NOFILE, (fileno_max, fileno_max)) self._swrk = subprocess.Popen([criu_binary, "swrk", "%d" % css[0].fileno()]) css[0].close() + resource.setrlimit(resource.RLIMIT_NOFILE, fileno_old) self._cs = css[1] self._last_req = -1 self._mem_fd = mem_sk.fileno()
criu restore has to be resored with a standard limit, because the kernel doesn't shrink fdtable, when a limit is reduced. fdtable-s are charged to kmem, so if we run criu restore with a big limit, all restored proccess are forked with this limit and only then they restore their limits, but fdtable-s are allocated for the initial limit, so they eat much more kernel memory then they have to. https://jira.sw.ru/browse/PSBM-67194 Cc: Cyrill Gorcunov <gorcunov@gmail.com> Cc: Pavel Vokhmyanin <pvokhmyanin@virtuozzo.com> Signed-off-by: Andrei Vagin <avagin@openvz.org> --- phaul/criu_api.py | 8 ++++++++ 1 file changed, 8 insertions(+)