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tools: hv: ignore ENOBUFS and ENOMEM in the KVP daemon

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Under high memory pressure and very high KVP R/W test pressure, the netlink
recvfrom() may transiently return ENOBUFS to the daemon -- we found this
during a 2-week stress test.

We'd better not terminate the daemon on the failure, because a typical KVP
user will re-try the R/W and hopefully it will succeed next time.

We can also ignore the errors on sending.

Cc: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dexuan Cui 2014-11-19 21:51:22 -08:00 committed by Greg Kroah-Hartman
parent 9e5db05aae
commit 4300f26492
1 changed files with 14 additions and 0 deletions
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14
tools/hv/hv_kvp_daemon.c
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@ -1559,8 +1559,15 @@ int main(int argc, char *argv[])
addr_p, &addr_l); addr_p, &addr_l);
if (len < 0) { if (len < 0) {
int saved_errno = errno;
syslog(LOG_ERR, "recvfrom failed; pid:%u error:%d %s", syslog(LOG_ERR, "recvfrom failed; pid:%u error:%d %s",
addr.nl_pid, errno, strerror(errno)); addr.nl_pid, errno, strerror(errno));
if (saved_errno == ENOBUFS) {
syslog(LOG_ERR, "receive error: ignored");
continue;
}
close(fd); close(fd);
return -1; return -1;
} }
@ -1763,8 +1770,15 @@ int main(int argc, char *argv[])
len = netlink_send(fd, incoming_cn_msg); len = netlink_send(fd, incoming_cn_msg);
if (len < 0) { if (len < 0) {
int saved_errno = errno;
syslog(LOG_ERR, "net_link send failed; error: %d %s", errno, syslog(LOG_ERR, "net_link send failed; error: %d %s", errno,
strerror(errno)); strerror(errno));
if (saved_errno == ENOMEM || saved_errno == ENOBUFS) {
syslog(LOG_ERR, "send error: ignored");
continue;
}
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }
} }