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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH 12/12] tools/xenstore: switch quota management to be table based
Instead of having individual quota variables switch to a table based
approach like the generic accounting. Include all the related data in
the same table and add accessor functions.
This enables to use the command line --quota parameter for setting all
possible quota values, keeping the previous parameters for
compatibility.
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
V2:
- new patch
One further remark: it would be rather easy to add soft-quota for all
the other quotas (similar to the memory one). This could be used as
an early warning for the need to raise global quota.
---
tools/xenstore/xenstored_control.c | 43 ++------
tools/xenstore/xenstored_core.c | 85 ++++++++--------
tools/xenstore/xenstored_core.h | 10 --
tools/xenstore/xenstored_domain.c | 130 +++++++++++++++++--------
tools/xenstore/xenstored_domain.h | 12 ++-
tools/xenstore/xenstored_transaction.c | 5 +-
tools/xenstore/xenstored_watch.c | 2 +-
7 files changed, 154 insertions(+), 133 deletions(-)
diff --git a/tools/xenstore/xenstored_control.c
b/tools/xenstore/xenstored_control.c
index 23098917ec..bfaba0a854 100644
--- a/tools/xenstore/xenstored_control.c
+++ b/tools/xenstore/xenstored_control.c
@@ -221,35 +221,6 @@ static int do_control_trace(const void *ctx, struct
connection *conn,
return 0;
}
-struct quota {
- const char *name;
- int *quota;
- const char *descr;
-};
-
-static const struct quota hard_quotas[] = {
- { "nodes", "a_nb_entry_per_domain, "Nodes per domain" },
- { "watches", "a_nb_watch_per_domain, "Watches per domain" },
- { "transactions", "a_max_transaction, "Transactions per domain" },
- { "outstanding", "a_req_outstanding,
- "Outstanding requests per domain" },
- { "transaction-nodes", "a_trans_nodes,
- "Max. number of accessed nodes per transaction" },
- { "memory", "a_memory_per_domain_hard,
- "Total Xenstore memory per domain (error level)" },
- { "node-size", "a_max_entry_size, "Max. size of a node" },
- { "path-max", "a_max_path_len, "Max. length of a node path" },
- { "permissions", "a_nb_perms_per_node,
- "Max. number of permissions per node" },
- { NULL, NULL, NULL }
-};
-
-static const struct quota soft_quotas[] = {
- { "memory", "a_memory_per_domain_soft,
- "Total Xenstore memory per domain (warning level)" },
- { NULL, NULL, NULL }
-};
-
static int quota_show_current(const void *ctx, struct connection *conn,
const struct quota *quotas)
{
@@ -260,9 +231,11 @@ static int quota_show_current(const void *ctx, struct
connection *conn,
if (!resp)
return ENOMEM;
- for (i = 0; quotas[i].quota; i++) {
+ for (i = 0; i < ACC_N; i++) {
+ if (!quotas[i].name)
+ continue;
resp = talloc_asprintf_append(resp, "%-17s: %8d %s\n",
- quotas[i].name, *quotas[i].quota,
+ quotas[i].name, quotas[i].val,
quotas[i].descr);
if (!resp)
return ENOMEM;
@@ -274,7 +247,7 @@ static int quota_show_current(const void *ctx, struct
connection *conn,
}
static int quota_set(const void *ctx, struct connection *conn,
- char **vec, int num, const struct quota *quotas)
+ char **vec, int num, struct quota *quotas)
{
unsigned int i;
int val;
@@ -286,9 +259,9 @@ static int quota_set(const void *ctx, struct connection
*conn,
if (val < 1)
return EINVAL;
- for (i = 0; quotas[i].quota; i++) {
- if (!strcmp(vec[0], quotas[i].name)) {
- *quotas[i].quota = val;
+ for (i = 0; i < ACC_N; i++) {
+ if (quotas[i].name && !strcmp(vec[0], quotas[i].name)) {
+ quotas[i].val = val;
send_ack(conn, XS_CONTROL);
return 0;
}
diff --git a/tools/xenstore/xenstored_core.c b/tools/xenstore/xenstored_core.c
index af16b18692..ae1ea29b80 100644
--- a/tools/xenstore/xenstored_core.c
+++ b/tools/xenstore/xenstored_core.c
@@ -89,17 +89,6 @@ unsigned int trace_flags = TRACE_OBJ | TRACE_IO;
static const char *sockmsg_string(enum xsd_sockmsg_type type);
-int quota_nb_entry_per_domain = 1000;
-int quota_nb_watch_per_domain = 128;
-int quota_max_entry_size = 2048; /* 2K */
-int quota_max_transaction = 10;
-int quota_nb_perms_per_node = 5;
-int quota_trans_nodes = 1024;
-int quota_max_path_len = XENSTORE_REL_PATH_MAX;
-int quota_req_outstanding = 20;
-int quota_memory_per_domain_soft = 2 * 1024 * 1024; /* 2 MB */
-int quota_memory_per_domain_hard = 2 * 1024 * 1024 + 512 * 1024; /* 2.5 MB */
-
unsigned int timeout_watch_event_msec = 20000;
void trace(const char *fmt, ...)
@@ -799,7 +788,7 @@ int write_node_raw(struct connection *conn, TDB_DATA *key,
struct node *node,
+ node->perms.num * sizeof(node->perms.p[0])
+ node->datalen + node->childlen;
- if (domain_max_chk(conn, ACC_NODESZ, data.dsize, quota_max_entry_size)
+ if (domain_max_chk(conn, ACC_NODESZ, data.dsize)
&& !no_quota_check) {
errno = ENOSPC;
return errno;
@@ -1192,8 +1181,7 @@ bool is_valid_nodename(const struct connection *conn,
const char *node)
if (sscanf(node, "/local/domain/%5u/%n", &domid, &local_off) != 1)
local_off = 0;
- if (domain_max_chk(conn, ACC_PATHLEN, strlen(node) - local_off,
- quota_max_path_len))
+ if (domain_max_chk(conn, ACC_PATHLEN, strlen(node) - local_off))
return false;
return valid_chars(node);
@@ -1491,7 +1479,7 @@ static struct node *create_node(struct connection *conn,
const void *ctx,
for (i = node; i; i = i->parent) {
/* i->parent is set for each new node, so check quota. */
if (i->parent &&
- domain_nbentry(conn) >= quota_nb_entry_per_domain) {
+ domain_nbentry(conn) >= hard_quotas[ACC_NODES].val) {
ret = ENOSPC;
goto err;
}
@@ -1767,7 +1755,7 @@ static int do_set_perms(const void *ctx, struct
connection *conn,
return EINVAL;
perms.num--;
- if (domain_max_chk(conn, ACC_NPERM, perms.num, quota_nb_perms_per_node))
+ if (domain_max_chk(conn, ACC_NPERM, perms.num))
return ENOSPC;
permstr = in->buffer + strlen(in->buffer) + 1;
@@ -2635,7 +2623,16 @@ static void usage(void)
" memory: total used memory per domain for nodes,\n"
" transactions, watches and requests, above\n"
" which Xenstore will stop talking to
domain\n"
+" nodes: number nodes owned by a domain\n"
+" node-permissions: number of access permissions
per\n"
+" node\n"
+" node-size: total size of a node (permissions +\n"
+" children names + content)\n"
" outstanding: number of outstanding requests\n"
+" path-length: length of a node path\n"
+" transactions: number of concurrent transactions\n"
+" per domain\n"
+" watches: number of watches per domain"
" -q, --quota-soft <what>=<nb> set a soft quota <what> to the value <nb>,\n"
" causing a warning to be issued via syslog() if
the\n"
" limit is violated, allowed quotas are:\n"
@@ -2686,12 +2683,12 @@ int dom0_domid = 0;
int dom0_event = 0;
int priv_domid = 0;
-static int get_optval_int(const char *arg)
+static unsigned int get_optval_int(const char *arg)
{
char *end;
- long val;
+ unsigned long val;
- val = strtol(arg, &end, 10);
+ val = strtoul(arg, &end, 10);
if (!*arg || *end || val < 0 || val > INT_MAX)
barf("invalid parameter value \"%s\"\n", arg);
@@ -2700,15 +2697,19 @@ static int get_optval_int(const char *arg)
static bool what_matches(const char *arg, const char *what)
{
- unsigned int what_len = strlen(what);
+ unsigned int what_len;
+
+ if (!what)
+ false;
+ what_len = strlen(what);
return !strncmp(arg, what, what_len) && arg[what_len] == '=';
}
static void set_timeout(const char *arg)
{
const char *eq = strchr(arg, '=');
- int val;
+ unsigned int val;
if (!eq)
barf("quotas must be specified via <what>=<seconds>\n");
@@ -2722,22 +2723,22 @@ static void set_timeout(const char *arg)
static void set_quota(const char *arg, bool soft)
{
const char *eq = strchr(arg, '=');
- int val;
+ struct quota *q = soft ? soft_quotas : hard_quotas;
+ unsigned int val;
+ unsigned int i;
if (!eq)
barf("quotas must be specified via <what>=<nb>\n");
val = get_optval_int(eq + 1);
- if (what_matches(arg, "outstanding") && !soft)
- quota_req_outstanding = val;
- else if (what_matches(arg, "transaction-nodes") && !soft)
- quota_trans_nodes = val;
- else if (what_matches(arg, "memory")) {
- if (soft)
- quota_memory_per_domain_soft = val;
- else
- quota_memory_per_domain_hard = val;
- } else
- barf("unknown quota \"%s\"\n", arg);
+
+ for (i = 0; i < ACC_N; i++) {
+ if (what_matches(arg, q[i].name)) {
+ q[i].val = val;
+ return;
+ }
+ }
+
+ barf("unknown quota \"%s\"\n", arg);
}
/* Sorted by bit values of TRACE_* flags. Flag is (1u << index). */
@@ -2789,7 +2790,7 @@ int main(int argc, char *argv[])
no_domain_init = true;
break;
case 'E':
- quota_nb_entry_per_domain = strtol(optarg, NULL, 10);
+ hard_quotas[ACC_NODES].val = strtoul(optarg, NULL, 10);
break;
case 'F':
pidfile = optarg;
@@ -2807,10 +2808,10 @@ int main(int argc, char *argv[])
recovery = false;
break;
case 'S':
- quota_max_entry_size = strtol(optarg, NULL, 10);
+ hard_quotas[ACC_NODESZ].val = strtoul(optarg, NULL, 10);
break;
case 't':
- quota_max_transaction = strtol(optarg, NULL, 10);
+ hard_quotas[ACC_TRANS].val = strtoul(optarg, NULL, 10);
break;
case 'T':
tracefile = optarg;
@@ -2829,15 +2830,17 @@ int main(int argc, char *argv[])
verbose = true;
break;
case 'W':
- quota_nb_watch_per_domain = strtol(optarg, NULL, 10);
+ hard_quotas[ACC_WATCH].val = strtoul(optarg, NULL, 10);
break;
case 'A':
- quota_nb_perms_per_node = strtol(optarg, NULL, 10);
+ hard_quotas[ACC_NPERM].val = strtoul(optarg, NULL, 10);
break;
case 'M':
- quota_max_path_len = strtol(optarg, NULL, 10);
- quota_max_path_len = min(XENSTORE_REL_PATH_MAX,
- quota_max_path_len);
+ hard_quotas[ACC_PATHLEN].val =
+ strtoul(optarg, NULL, 10);
+ hard_quotas[ACC_PATHLEN].val =
+ min((unsigned int)XENSTORE_REL_PATH_MAX,
+ hard_quotas[ACC_PATHLEN].val);
break;
case 'Q':
set_quota(optarg, false);
diff --git a/tools/xenstore/xenstored_core.h b/tools/xenstore/xenstored_core.h
index 752c69d80f..e3a987028a 100644
--- a/tools/xenstore/xenstored_core.h
+++ b/tools/xenstore/xenstored_core.h
@@ -307,16 +307,6 @@ extern TDB_CONTEXT *tdb_ctx;
extern int dom0_domid;
extern int dom0_event;
extern int priv_domid;
-extern int quota_nb_watch_per_domain;
-extern int quota_max_transaction;
-extern int quota_max_entry_size;
-extern int quota_nb_perms_per_node;
-extern int quota_max_path_len;
-extern int quota_nb_entry_per_domain;
-extern int quota_req_outstanding;
-extern int quota_trans_nodes;
-extern int quota_memory_per_domain_soft;
-extern int quota_memory_per_domain_hard;
extern bool keep_orphans;
extern unsigned int timeout_watch_event_msec;
diff --git a/tools/xenstore/xenstored_domain.c
b/tools/xenstore/xenstored_domain.c
index 2b4a551df5..1f746afd70 100644
--- a/tools/xenstore/xenstored_domain.c
+++ b/tools/xenstore/xenstored_domain.c
@@ -43,7 +43,61 @@ static evtchn_port_t virq_port;
xenevtchn_handle *xce_handle = NULL;
-static unsigned int acc_global_max[ACC_N];
+struct quota hard_quotas[ACC_N] = {
+ [ACC_NODES] = {
+ .name = "nodes",
+ .descr = "Nodes per domain",
+ .val = 1000,
+ },
+ [ACC_WATCH] = {
+ .name = "watches",
+ .descr = "Watches per domain",
+ .val = 128,
+ },
+ [ACC_OUTST] = {
+ .name = "outstanding",
+ .descr = "Outstanding requests per domain",
+ .val = 20,
+ },
+ [ACC_MEM] = {
+ .name = "memory",
+ .descr = "Total Xenstore memory per domain (error level)",
+ .val = 2 * 1024 * 1024 + 512 * 1024, /* 2.5 MB */
+ },
+ [ACC_TRANS] = {
+ .name = "transactions",
+ .descr = "Active transactions per domain",
+ .val = 10,
+ },
+ [ACC_TRANSNODES] = {
+ .name = "transaction-nodes",
+ .descr = "Max. number of accessed nodes per transaction",
+ .val = 1024,
+ },
+ [ACC_NPERM] = {
+ .name = "node-permissions",
+ .descr = "Max. number of permissions per node",
+ .val = 5,
+ },
+ [ACC_PATHLEN] = {
+ .name = "path-max",
+ .descr = "Max. length of a node path",
+ .val = XENSTORE_REL_PATH_MAX,
+ },
+ [ACC_NODESZ] = {
+ .name = "node-size",
+ .descr = "Max. size of a node",
+ .val = 2048,
+ },
+};
+
+struct quota soft_quotas[ACC_N] = {
+ [ACC_MEM] = {
+ .name = "memory",
+ .descr = "Total Xenstore memory per domain (warning level)",
+ .val = 2 * 1024 * 1024, /* 2.0 MB */
+ },
+};
struct domain
{
@@ -204,10 +258,10 @@ static bool domain_can_read(struct connection *conn)
if (domain_is_unprivileged(conn)) {
if (domain->wrl_credit < 0)
return false;
- if (domain->acc[ACC_OUTST].val >= quota_req_outstanding)
+ if (domain->acc[ACC_OUTST].val >= hard_quotas[ACC_OUTST].val)
return false;
- if (domain->acc[ACC_MEM].val >= quota_memory_per_domain_hard &&
- quota_memory_per_domain_hard)
+ if (domain->acc[ACC_MEM].val >= hard_quotas[ACC_MEM].val &&
+ hard_quotas[ACC_MEM].val)
return false;
}
@@ -426,6 +480,7 @@ int domain_get_quota(const void *ctx, struct connection
*conn,
{
struct domain *d = find_domain_struct(domid);
char *resp;
+ unsigned int i;
if (!d)
return ENOENT;
@@ -434,19 +489,15 @@ int domain_get_quota(const void *ctx, struct connection
*conn,
if (!resp)
return ENOMEM;
-#define ent(t, e) \
- resp = talloc_asprintf_append(resp, "%-17s: %8u (max: %8u\n", #t, \
- d->acc[e].val, d->acc[e].max); \
- if (!resp) return ENOMEM
-
- ent(nodes, ACC_NODES);
- ent(watches, ACC_WATCH);
- ent(transactions, ACC_TRANS);
- ent(outstanding, ACC_OUTST);
- ent(memory, ACC_MEM);
- ent(transaction-nodes, ACC_TRANSNODES);
-
-#undef ent
+ for (i = 0; i < ACC_N; i++) {
+ if (!hard_quotas[i].name)
+ continue;
+ resp = talloc_asprintf_append(resp, "%-17s: %8u (max %8u)\n",
+ hard_quotas[i].name,
+ d->acc[i].val, d->acc[i].max);
+ if (!resp)
+ return ENOMEM;
+ }
send_reply(conn, XS_CONTROL, resp, strlen(resp) + 1);
@@ -456,24 +507,21 @@ int domain_get_quota(const void *ctx, struct connection
*conn,
int domain_max_global_acc(const void *ctx, struct connection *conn)
{
char *resp;
+ unsigned int i;
resp = talloc_asprintf(ctx, "Max. seen accounting values:\n");
if (!resp)
return ENOMEM;
-#define ent(t, e) \
- resp = talloc_asprintf_append(resp, "%-17s: %8u\n", #t, \
- acc_global_max[e]); \
- if (!resp) return ENOMEM
-
- ent(nodes, ACC_NODES);
- ent(watches, ACC_WATCH);
- ent(transactions, ACC_TRANS);
- ent(outstanding, ACC_OUTST);
- ent(memory, ACC_MEM);
- ent(transaction-nodes, ACC_TRANSNODES);
-
-#undef ent
+ for (i = 0; i < ACC_N; i++) {
+ if (!hard_quotas[i].name)
+ continue;
+ resp = talloc_asprintf_append(resp, "%-17s: %8u\n",
+ hard_quotas[i].name,
+ hard_quotas[i].max);
+ if (!resp)
+ return ENOMEM;
+ }
send_reply(conn, XS_CONTROL, resp, strlen(resp) + 1);
@@ -592,7 +640,7 @@ int acc_fix_domains(struct list_head *head, bool update)
list_for_each_entry(cd, head, list) {
cnt = domain_nbentry_fix(cd->domid, cd->acc[ACC_NODES], update);
if (!update) {
- if (cnt >= quota_nb_entry_per_domain)
+ if (cnt >= hard_quotas[ACC_NODES].val)
return ENOSPC;
if (cnt < 0)
return ENOMEM;
@@ -1091,8 +1139,8 @@ static void domain_acc_chk_max(struct domain *d, unsigned
int what,
{
if (val > d->acc[what].max)
d->acc[what].max = val;
- if (val > acc_global_max[what] && domid_is_unprivileged(domid))
- acc_global_max[what] = val;
+ if (val > hard_quotas[what].max && domid_is_unprivileged(domid))
+ hard_quotas[what].max = val;
}
static int domain_acc_add_chk(struct domain *d, unsigned int what, int add,
@@ -1218,19 +1266,19 @@ void domain_reset_global_acc(void)
unsigned int i;
for (i = 0; i < ACC_N; i++)
- acc_global_max[i] = 0;
+ hard_quotas[i].max = 0;
/* Set current max values seen. */
hashtable_iterate(domhash, domain_reset_global_acc_sub, NULL);
}
bool domain_max_chk(const struct connection *conn, unsigned int what,
- unsigned int val, unsigned int quota)
+ unsigned int val)
{
if (!conn || !conn->domain)
return false;
- if (domain_is_unprivileged(conn) && val > quota)
+ if (domain_is_unprivileged(conn) && val > hard_quotas[what].val)
return true;
domain_acc_chk_max(conn->domain, what, val, conn->id);
@@ -1279,8 +1327,7 @@ static bool domain_chk_quota(struct connection *conn,
unsigned int mem)
domain = conn->domain;
now = time(NULL);
- if (mem >= quota_memory_per_domain_hard &&
- quota_memory_per_domain_hard) {
+ if (mem >= hard_quotas[ACC_MEM].val && hard_quotas[ACC_MEM].val) {
if (domain->hard_quota_reported)
return true;
syslog(LOG_ERR, "Domain %u exceeds hard memory quota, Xenstore
interface to domain stalled\n",
@@ -1297,15 +1344,14 @@ static bool domain_chk_quota(struct connection *conn,
unsigned int mem)
syslog(LOG_INFO, "Domain %u below hard memory quota
again\n",
domain->domid);
}
- if (mem >= quota_memory_per_domain_soft &&
- quota_memory_per_domain_soft &&
- !domain->soft_quota_reported) {
+ if (mem >= soft_quotas[ACC_MEM].val &&
+ soft_quotas[ACC_MEM].val && !domain->soft_quota_reported) {
domain->mem_last_msg = now;
domain->soft_quota_reported = true;
syslog(LOG_WARNING, "Domain %u exceeds soft memory
quota\n",
domain->domid);
}
- if (mem < quota_memory_per_domain_soft &&
+ if (mem < soft_quotas[ACC_MEM].val &&
domain->soft_quota_reported) {
domain->mem_last_msg = now;
domain->soft_quota_reported = false;
diff --git a/tools/xenstore/xenstored_domain.h
b/tools/xenstore/xenstored_domain.h
index 2bf9b0d87b..1d11085ebc 100644
--- a/tools/xenstore/xenstored_domain.h
+++ b/tools/xenstore/xenstored_domain.h
@@ -34,6 +34,16 @@ enum {
ACC_N /* Number of elements per domain. */
};
+struct quota {
+ const char *name;
+ const char *descr;
+ unsigned int val;
+ unsigned int max;
+};
+
+extern struct quota hard_quotas[ACC_N];
+extern struct quota soft_quotas[ACC_N];
+
void handle_event(void);
void check_domains(void);
@@ -123,7 +133,7 @@ void acc_commit(struct connection *conn);
int domain_max_global_acc(const void *ctx, struct connection *conn);
void domain_reset_global_acc(void);
bool domain_max_chk(const struct connection *conn, unsigned int what,
- unsigned int val, unsigned int quota);
+ unsigned int val);
/* Write rate limiting */
diff --git a/tools/xenstore/xenstored_transaction.c
b/tools/xenstore/xenstored_transaction.c
index 7967770ca2..13fabe030d 100644
--- a/tools/xenstore/xenstored_transaction.c
+++ b/tools/xenstore/xenstored_transaction.c
@@ -244,8 +244,7 @@ int access_node(struct connection *conn, struct node *node,
i = find_accessed_node(trans, node->name);
if (!i) {
- if (domain_max_chk(conn, ACC_TRANSNODES, trans->nodes + 1,
- quota_trans_nodes)) {
+ if (domain_max_chk(conn, ACC_TRANSNODES, trans->nodes + 1)) {
ret = ENOSPC;
goto err;
}
@@ -471,7 +470,7 @@ int do_transaction_start(const void *ctx, struct connection
*conn,
if (conn->transaction)
return EBUSY;
- if (domain_transaction_get(conn) > quota_max_transaction)
+ if (domain_transaction_get(conn) > hard_quotas[ACC_TRANS].val)
return ENOSPC;
/* Attach transaction to ctx for autofree until it's complete */
diff --git a/tools/xenstore/xenstored_watch.c b/tools/xenstore/xenstored_watch.c
index 4deef21c4c..ca0194966e 100644
--- a/tools/xenstore/xenstored_watch.c
+++ b/tools/xenstore/xenstored_watch.c
@@ -239,7 +239,7 @@ int do_watch(const void *ctx, struct connection *conn,
struct buffered_data *in)
return EEXIST;
}
- if (domain_watch(conn) > quota_nb_watch_per_domain)
+ if (domain_watch(conn) > hard_quotas[ACC_WATCH].val)
return E2BIG;
watch = add_watch(conn, vec[0], vec[1], relative, false);
--
2.35.3
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