[libvirt] [V2 1/5] Resctrl: Add some utils functions
Eli Qiao
liyong.qiao at intel.com
Fri Feb 3 03:47:12 UTC 2017
This patch adds some utils struct and functions to expose resctrl
information.
virResCtrlAvailable: If resctrl interface exist on host
virResCtrlGet: get specify type resource contral information
virResCtrlInit: initialize resctrl struct from the host's sys fs.
ResCtrlAll[]: an array to maintain resource control information.
Signed-off-by: Eli Qiao <liyong.qiao at intel.com>
---
include/libvirt/virterror.h | 1 +
src/Makefile.am | 1 +
src/libvirt_private.syms | 4 +
src/util/virerror.c | 1 +
src/util/virresctrl.c | 330 ++++++++++++++++++++++++++++++++++++++++++++
src/util/virresctrl.h | 89 ++++++++++++
6 files changed, 426 insertions(+)
create mode 100644 src/util/virresctrl.c
create mode 100644 src/util/virresctrl.h
diff --git a/include/libvirt/virterror.h b/include/libvirt/virterror.h
index 2efee8f..3dd2d08 100644
--- a/include/libvirt/virterror.h
+++ b/include/libvirt/virterror.h
@@ -132,6 +132,7 @@ typedef enum {
VIR_FROM_PERF = 65, /* Error from perf */
VIR_FROM_LIBSSH = 66, /* Error from libssh connection transport */
+ VIR_FROM_RESCTRL = 67, /* Error from resource control */
# ifdef VIR_ENUM_SENTINELS
VIR_ERR_DOMAIN_LAST
diff --git a/src/Makefile.am b/src/Makefile.am
index 2f32d41..b626f29 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -162,6 +162,7 @@ UTIL_SOURCES = \
util/virprocess.c util/virprocess.h \
util/virqemu.c util/virqemu.h \
util/virrandom.h util/virrandom.c \
+ util/virresctrl.h util/virresctrl.c \
util/virrotatingfile.h util/virrotatingfile.c \
util/virscsi.c util/virscsi.h \
util/virscsivhost.c util/virscsivhost.h \
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 8e994c7..743e5ac 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -2313,6 +2313,10 @@ virRandomGenerateWWN;
virRandomInt;
+# util/virresctrl.h
+virResCtrlAvailable;
+virResCtrlInit;
+
# util/virrotatingfile.h
virRotatingFileReaderConsume;
virRotatingFileReaderFree;
diff --git a/src/util/virerror.c b/src/util/virerror.c
index ef17fb5..93dfd4f 100644
--- a/src/util/virerror.c
+++ b/src/util/virerror.c
@@ -139,6 +139,7 @@ VIR_ENUM_IMPL(virErrorDomain, VIR_ERR_DOMAIN_LAST,
"Perf", /* 65 */
"Libssh transport layer",
+ "Rescouce Control",
)
diff --git a/src/util/virresctrl.c b/src/util/virresctrl.c
new file mode 100644
index 0000000..63bc808
--- /dev/null
+++ b/src/util/virresctrl.c
@@ -0,0 +1,330 @@
+/*
+ * virresctrl.c: methods for managing resource contral
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ * Eli Qiao <liyong.qiao at intel.com>
+ */
+#include <config.h>
+
+#include <sys/ioctl.h>
+#if defined HAVE_SYS_SYSCALL_H
+# include <sys/syscall.h>
+#endif
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include "virresctrl.h"
+#include "viralloc.h"
+#include "virerror.h"
+#include "virfile.h"
+#include "virhostcpu.h"
+#include "virlog.h"
+#include "virstring.h"
+#include "nodeinfo.h"
+
+VIR_LOG_INIT("util.resctrl");
+
+#define VIR_FROM_THIS VIR_FROM_RESCTRL
+
+static unsigned int host_id = 0;
+
+static virResCtrl ResCtrlAll[] = {
+ {
+ .name = "L3",
+ .cache_level = "l3",
+ },
+ {
+ .name = "L3DATA",
+ .cache_level = "l3",
+ },
+ {
+ .name = "L3CODE",
+ .cache_level = "l3",
+ },
+ {
+ .name = "L2",
+ .cache_level = "l2",
+ },
+};
+
+static int virResCtrlGetInfoStr(const int type, const char *item, char **str)
+{
+ int ret = 0;
+ char *tmp;
+ char *path;
+
+ if (asprintf(&path, "%s/%s/%s", RESCTRL_INFO_DIR, ResCtrlAll[type].name, item) < 0)
+ return -1;
+ if (virFileReadAll(path, 10, str) < 0) {
+ ret = -1;
+ goto cleanup;
+ }
+
+ if ((tmp = strchr(*str, '\n'))) {
+ *tmp = '\0';
+ }
+
+cleanup:
+ VIR_FREE(path);
+ return ret;
+}
+
+
+static int virResCtrlGetCPUValue(const char* path, char** value)
+{
+ int ret = -1;
+ char* tmp;
+
+ if(virFileReadAll(path, 10, value) < 0) {
+ goto cleanup;
+ }
+ if ((tmp = strchr(*value, '\n'))) {
+ *tmp = '\0';
+ }
+ ret = 0;
+cleanup:
+ return ret;
+}
+
+static int virResctrlGetCPUSocketID(const size_t cpu, int* socket_id)
+{
+ int ret = -1;
+ char* physical_package_path = NULL;
+ char* physical_package = NULL;
+ if (virAsprintf(&physical_package_path,
+ "%s/cpu/cpu%zu/topology/physical_package_id",
+ SYSFS_SYSTEM_PATH, cpu) < 0) {
+ return -1;
+ }
+
+ if(virResCtrlGetCPUValue(physical_package_path,
+ &physical_package) < 0)
+ goto cleanup;
+
+ if (virStrToLong_i(physical_package, NULL, 0, socket_id) < 0)
+ goto cleanup;
+
+ ret = 0;
+cleanup:
+ VIR_FREE(physical_package);
+ VIR_FREE(physical_package_path);
+ return ret;
+}
+
+static int virResCtrlGetCPUCache(const size_t cpu, int type, int *cache)
+{
+ int ret = -1;
+ char* cache_dir = NULL;
+ char* cache_str = NULL;
+ char* tmp;
+ int carry = -1;
+
+ if (virAsprintf(&cache_dir,
+ "%s/cpu/cpu%zu/cache/index%d/size",
+ SYSFS_SYSTEM_PATH, cpu, type) < 0)
+ return -1;
+
+ if(virResCtrlGetCPUValue(cache_dir, &cache_str) < 0)
+ goto cleanup;
+
+ tmp = cache_str;
+
+ while (*tmp != '\0')
+ tmp++;
+ if (*(tmp - 1) == 'K') {
+ *(tmp - 1) = '\0';
+ carry = 1;
+ }
+ else if (*(tmp - 1) == 'M') {
+ *(tmp - 1) = '\0';
+ carry = 1024;
+ }
+
+ if (virStrToLong_i(cache_str, NULL, 0, cache) < 0)
+ goto cleanup;
+
+ *cache = (*cache) * carry;
+
+ if (*cache < 0)
+ goto cleanup;
+
+ ret = 0;
+cleanup:
+ VIR_FREE(cache_dir);
+ VIR_FREE(cache_str);
+ return ret;
+}
+
+/* Fill all cache bank informations */
+static virResCacheBankPtr virResCtrlGetCacheBanks(int type, int* n_sockets)
+{
+ int npresent_cpus;
+ int index = -1;
+ virResCacheBankPtr bank;
+
+ *n_sockets = 1;
+ if ((npresent_cpus = virHostCPUGetCount()) < 0)
+ return NULL;
+
+ if (type == RDT_RESOURCE_L3
+ || type == RDT_RESOURCE_L3DATA
+ || type == RDT_RESOURCE_L3CODE)
+ index = 3;
+ else if (type == RDT_RESOURCE_L2) {
+ index = 2;
+ }
+
+ if (index == -1)
+ return NULL;
+
+ if(VIR_ALLOC_N(bank, *n_sockets) < 0)
+ {
+ *n_sockets = 0;
+ return NULL;
+ }
+
+ for( size_t i = 0; i < npresent_cpus ; i ++) {
+ int s_id;
+ int cache_size;
+
+ if (virResctrlGetCPUSocketID(i, &s_id) < 0) {
+ goto error;
+ }
+
+ if(s_id > (*n_sockets - 1)) {
+ size_t cur = *n_sockets;
+ size_t exp = s_id - (*n_sockets) + 1;
+ if(VIR_EXPAND_N(bank, cur, exp) < 0) {
+ goto error;
+ }
+ }
+ *n_sockets = s_id + 1;
+ if (bank[s_id].cpu_mask == NULL) {
+ if (!(bank[s_id].cpu_mask = virBitmapNew(npresent_cpus)))
+ goto error;
+ }
+
+ ignore_value(virBitmapSetBit(bank[s_id].cpu_mask, i));
+
+ if (bank[s_id].cache_size == 0) {
+ if (virResCtrlGetCPUCache(i, index, &cache_size) < 0) {
+ goto error;
+ }
+ bank[s_id].cache_size = cache_size;
+ bank[s_id].cache_min = cache_size / ResCtrlAll[type].cbm_len;
+ }
+ }
+ return bank;
+
+error:
+ *n_sockets = 0;
+ VIR_FREE(bank);
+ return NULL;
+}
+
+static int virResCtrlGetConfig(int type)
+{
+ int ret;
+ int i;
+ char *str;
+
+ /* Read min_cbm_bits from resctrl.
+ eg: /sys/fs/resctrl/info/L3/num_closids
+ */
+ if ((ret = virResCtrlGetInfoStr(type, "num_closids", &str)) < 0) {
+ return ret;
+ }
+ if (virStrToLong_i(str, NULL, 10, &ResCtrlAll[type].num_closid) < 0) {
+ return -1;
+ }
+ VIR_FREE(str);
+
+ /* Read min_cbm_bits from resctrl.
+ eg: /sys/fs/resctrl/info/L3/cbm_mask
+ */
+ if ((ret = virResCtrlGetInfoStr(type, "min_cbm_bits", &str)) < 0) {
+ return ret;
+ }
+ if (virStrToLong_i(str, NULL, 10, &ResCtrlAll[type].min_cbm_bits) < 0) {
+ return -1;
+ }
+ VIR_FREE(str);
+
+ /* Read cbm_mask string from resctrl.
+ eg: /sys/fs/resctrl/info/L3/cbm_mask
+ */
+ if ((ret = virResCtrlGetInfoStr(type, "cbm_mask", &str)) < 0) {
+ return ret;
+ }
+
+ /* Calculate cbm length from the default cbm_mask. */
+ ResCtrlAll[type].cbm_len = strlen(str) * 4;
+ VIR_FREE(str);
+
+ /* Get all cache bank informations */
+ ResCtrlAll[type].cache_banks = virResCtrlGetCacheBanks(type,
+ &(ResCtrlAll[type].num_banks));
+
+ if(ResCtrlAll[type].cache_banks == NULL)
+ return -1;
+
+ for( i = 0; i < ResCtrlAll[type].num_banks; i++)
+ {
+ /*L3CODE and L3DATA shares same L3 resource, so they should
+ * have same host_id. */
+ if (type == RDT_RESOURCE_L3CODE) {
+ ResCtrlAll[type].cache_banks[i].host_id = ResCtrlAll[RDT_RESOURCE_L3DATA].cache_banks[i].host_id;
+ }
+ else {
+ ResCtrlAll[type].cache_banks[i].host_id = host_id++;
+ }
+ }
+
+ ResCtrlAll[type].enabled = true;
+
+ return ret;
+}
+
+int virResCtrlInit(void) {
+ int i = 0;
+ char *tmp;
+ int rc = 0;
+
+ for(i = 0; i < RDT_NUM_RESOURCES; i++) {
+ if ((rc = asprintf(&tmp, "%s/%s", RESCTRL_INFO_DIR, ResCtrlAll[i].name)) < 0) {
+ continue;
+ }
+ if (virFileExists(tmp)) {
+ if ((rc = virResCtrlGetConfig(i)) < 0 )
+ VIR_WARN("Ignor error while get config for %d", i);
+ }
+
+ VIR_FREE(tmp);
+ }
+ return rc;
+}
+
+bool virResCtrlAvailable(void) {
+ if (!virFileExists(RESCTRL_INFO_DIR))
+ return false;
+ return true;
+}
+
+virResCtrlPtr virResCtrlGet(int type) {
+ return &ResCtrlAll[type];
+}
diff --git a/src/util/virresctrl.h b/src/util/virresctrl.h
new file mode 100644
index 0000000..f713e66
--- /dev/null
+++ b/src/util/virresctrl.h
@@ -0,0 +1,89 @@
+/*
+ * * virrscctrl.h: methods for managing rscctrl
+ * *
+ * * Copyright (C) 2016 Intel, Inc.
+ * *
+ * * This library is free software; you can redistribute it and/or
+ * * modify it under the terms of the GNU Lesser General Public
+ * * License as published by the Free Software Foundation; either
+ * * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ * Eli Qiao <liyong.qiao at intel.com>
+ */
+
+#ifndef __VIR_RESCTRL_H__
+# define __VIR_RESCTRL_H__
+
+# include "virutil.h"
+# include "virbitmap.h"
+
+#define RESCTRL_DIR "/sys/fs/resctrl"
+#define RESCTRL_INFO_DIR "/sys/fs/resctrl/info"
+#define SYSFS_SYSTEM_PATH "/sys/devices/system"
+
+#define MAX_CPU_SOCKET_NUM 8
+#define MAX_CBM_BIT_LEN 32
+#define MAX_SCHEMATA_LEN 1024
+#define MAX_FILE_LEN ( 10 * 1024 * 1024)
+
+enum {
+ RDT_RESOURCE_L3,
+ RDT_RESOURCE_L3DATA,
+ RDT_RESOURCE_L3CODE,
+ RDT_RESOURCE_L2,
+ /* Must be the last */
+ RDT_NUM_RESOURCES,
+};
+
+
+typedef struct _virResCacheBank virResCacheBank;
+typedef virResCacheBank *virResCacheBankPtr;
+struct _virResCacheBank {
+ unsigned int host_id;
+ unsigned long long cache_size;
+ unsigned long long cache_left;
+ unsigned long long cache_min;
+ virBitmapPtr cpu_mask;
+};
+
+/**
+ * struct rdt_resource - attributes of an RDT resource
+ * @enabled: Is this feature enabled on this machine
+ * @name: Name to use in "schemata" file
+ * @num_closid: Number of CLOSIDs available
+ * @max_cbm: Largest Cache Bit Mask allowed
+ * @min_cbm_bits: Minimum number of consecutive bits to be set
+ * in a cache bit mask
+ * @cache_level: Which cache level defines scope of this domain
+ * @num_banks: Number of cache bank on this machine.
+ * @cache_banks: Array of cache bank
+ */
+typedef struct _virResCtrl virResCtrl;
+typedef virResCtrl *virResCtrlPtr;
+struct _virResCtrl {
+ bool enabled;
+ const char *name;
+ int num_closid;
+ int cbm_len;
+ int min_cbm_bits;
+ const char* cache_level;
+ int num_banks;
+ virResCacheBankPtr cache_banks;
+};
+
+
+bool virResCtrlAvailable(void);
+int virResCtrlInit(void);
+virResCtrlPtr virResCtrlGet(int);
+
+#endif
--
1.9.1
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