diff options
Diffstat (limited to 'system/xen/xsa/xsa206-4.8-0002-xenstored-Log-when-the-write-transaction-rate-limit-.patch')
| -rw-r--r-- | system/xen/xsa/xsa206-4.8-0002-xenstored-Log-when-the-write-transaction-rate-limit-.patch | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/system/xen/xsa/xsa206-4.8-0002-xenstored-Log-when-the-write-transaction-rate-limit-.patch b/system/xen/xsa/xsa206-4.8-0002-xenstored-Log-when-the-write-transaction-rate-limit-.patch new file mode 100644 index 0000000000..57e1e9be9e --- /dev/null +++ b/system/xen/xsa/xsa206-4.8-0002-xenstored-Log-when-the-write-transaction-rate-limit-.patch @@ -0,0 +1,113 @@ +From 6a5b012157c3dbe4bb82f2aa3d950e20cb5bf9d6 Mon Sep 17 00:00:00 2001 +From: Ian Jackson <ian.jackson@eu.citrix.com> +Date: Tue, 7 Mar 2017 16:09:13 +0000 +Subject: [PATCH 02/15] xenstored: Log when the write transaction rate limit + bites + +Reported-by: Juergen Gross <jgross@suse.com> +Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com> +--- + tools/xenstore/xenstored_core.c | 1 + + tools/xenstore/xenstored_domain.c | 25 +++++++++++++++++++++++++ + tools/xenstore/xenstored_domain.h | 2 ++ + 3 files changed, 28 insertions(+) + +diff --git a/tools/xenstore/xenstored_core.c b/tools/xenstore/xenstored_core.c +index d14f096..dc9a26f 100644 +--- a/tools/xenstore/xenstored_core.c ++++ b/tools/xenstore/xenstored_core.c +@@ -379,6 +379,7 @@ static void initialize_fds(int sock, int *p_sock_pollfd_idx, + POLLIN|POLLPRI); + + wrl_gettime_now(&now); ++ wrl_log_periodic(now); + + list_for_each_entry(conn, &connections, list) { + if (conn->domain) { +diff --git a/tools/xenstore/xenstored_domain.c b/tools/xenstore/xenstored_domain.c +index 012dfe6..fd9ca39 100644 +--- a/tools/xenstore/xenstored_domain.c ++++ b/tools/xenstore/xenstored_domain.c +@@ -22,6 +22,7 @@ + #include <stdlib.h> + #include <stdarg.h> + #include <time.h> ++#include <syslog.h> + + #include "utils.h" + #include "talloc.h" +@@ -79,6 +80,7 @@ struct domain + /* write rate limit */ + wrl_creditt wrl_credit; /* [ -wrl_config_writecost, +_dburst ] */ + struct wrl_timestampt wrl_timestamp; ++ bool wrl_delay_logged; + }; + + static LIST_HEAD(domains); +@@ -774,6 +776,7 @@ long wrl_ntransactions; + + static long wrl_ndomains; + static wrl_creditt wrl_reserve; /* [-wrl_config_newdoms_dburst, +_gburst ] */ ++static time_t wrl_log_last_warning; /* 0: no previous warning */ + + void wrl_gettime_now(struct wrl_timestampt *now_wt) + { +@@ -923,6 +926,9 @@ void wrl_check_timeout(struct domain *domain, + wakeup); + } + ++#define WRL_LOG(now, ...) \ ++ (syslog(LOG_WARNING, "write rate limit: " __VA_ARGS__)) ++ + void wrl_apply_debit_actual(struct domain *domain) + { + struct wrl_timestampt now; +@@ -938,6 +944,25 @@ void wrl_apply_debit_actual(struct domain *domain) + trace("wrl: domain %u credit=%ld (reserve=%ld)\n", + domain->domid, + (long)domain->wrl_credit, (long)wrl_reserve); ++ ++ if (domain->wrl_credit < 0) { ++ if (!domain->wrl_delay_logged++) { ++ WRL_LOG(now, "domain %ld is affected", ++ (long)domain->domid); ++ } else if (!wrl_log_last_warning) { ++ WRL_LOG(now, "rate limiting restarts"); ++ } ++ wrl_log_last_warning = now.sec; ++ } ++} ++ ++void wrl_log_periodic(struct wrl_timestampt now) ++{ ++ if (wrl_log_last_warning && ++ (now.sec - wrl_log_last_warning) > WRL_LOGEVERY) { ++ WRL_LOG(now, "not in force recently"); ++ wrl_log_last_warning = 0; ++ } + } + + void wrl_apply_debit_direct(struct connection *conn) +diff --git a/tools/xenstore/xenstored_domain.h b/tools/xenstore/xenstored_domain.h +index cec341e..561ab5d 100644 +--- a/tools/xenstore/xenstored_domain.h ++++ b/tools/xenstore/xenstored_domain.h +@@ -72,6 +72,7 @@ int domain_watch(struct connection *conn); + #define WRL_DBURST 10 + #define WRL_GBURST 1000 + #define WRL_NEWDOMS 5 ++#define WRL_LOGEVERY 120 /* seconds */ + + struct wrl_timestampt { + time_t sec; +@@ -87,6 +88,7 @@ void wrl_credit_update(struct domain *domain, struct wrl_timestampt now); + void wrl_check_timeout(struct domain *domain, + struct wrl_timestampt now, + int *ptimeout); ++void wrl_log_periodic(struct wrl_timestampt now); + void wrl_apply_debit_direct(struct connection *conn); + void wrl_apply_debit_trans_commit(struct connection *conn); + +-- +2.1.4 + |