[libvirt] [RFC] [PATCH 4/5] make /proc/meminfo isolate with host through fuse
Gao feng
gaofeng at cn.fujitsu.com
Wed Jul 11 07:58:22 UTC 2012
with this patch,container's meminfo will be shown based on
containers' mem cgroup.
Right now,it's impossible to virtualize all values in meminfo,
I collect some values such as MemTotal,MemFree,Cached,Active,
Inactive,Active(anon),Inactive(anon),Active(file),Inactive(anon),
Active(file),Inactive(file),Unevictable,SwapTotal,SwapFree.
if I miss something, please let me know.
Signed-off-by: Gao feng <gaofeng at cn.fujitsu.com>
---
src/lxc/lxc_fuse.c | 340 ++++++++++++++++++++++++++++++++++++++++++++++++++--
1 files changed, 332 insertions(+), 8 deletions(-)
diff --git a/src/lxc/lxc_fuse.c b/src/lxc/lxc_fuse.c
index 5fdacab..69b4f2e 100644
--- a/src/lxc/lxc_fuse.c
+++ b/src/lxc/lxc_fuse.c
@@ -32,22 +32,52 @@
#include "lxc_fuse.h"
#include "util.h"
#include "memory.h"
+#include "virfile.h"
#define VIR_FROM_THIS VIR_FROM_LXC
#if HAVE_FUSE
+enum {
+ MEMTOTAL,
+ MEMUSAGE,
+ CACHED,
+ ACTIVE_ANON,
+ INACTIVE_ANON,
+ ACTIVE_FILE,
+ INACTIVE_FILE,
+ UNEVICTABLE,
+ SWAPTOTAL,
+ SWAPUSAGE,
+ MEMMAX,
+};
+
+static const char *meminfo_path = "/meminfo";
static int lxcProcGetattr(const char *path, struct stat *stbuf)
{
int res = 0;
+ char *mempath = NULL;
+ struct stat sb;
+ virAsprintf(&mempath, "/proc/%s",path);
memset(stbuf, 0, sizeof(struct stat));
if (strcmp(path, "/") == 0) {
stbuf->st_mode = S_IFDIR | 0755;
stbuf->st_nlink = 2;
+ } else if (strcmp(path, meminfo_path) == 0) {
+ stat(mempath, &sb);
+ stbuf->st_mode = S_IFREG | 0444;
+ stbuf->st_nlink = 1;
+ stbuf->st_blksize = sb.st_blksize;
+ stbuf->st_blocks = sb.st_blocks;
+ stbuf->st_size = sb.st_size;
+ stbuf->st_atime = sb.st_atime;
+ stbuf->st_ctime = sb.st_ctime;
+ stbuf->st_mtime = sb.st_mtime;
} else
res = -ENOENT;
+ VIR_FREE(mempath);
return res;
}
@@ -61,23 +91,317 @@ static int lxcProcReaddir(const char *path, void *buf,
filler(buf, ".", NULL, 0);
filler(buf, "..", NULL, 0);
+ filler(buf, meminfo_path + 1, NULL, 0);
return 0;
}
-static int lxcProcOpen(const char *path ATTRIBUTE_UNUSED,
- struct fuse_file_info *fi ATTRIBUTE_UNUSED)
+static int lxcProcOpen(const char *path,
+ struct fuse_file_info *fi)
+{
+ if (strcmp(path, meminfo_path) != 0)
+ return -ENOENT;
+
+ if ((fi->flags & 3) != O_RDONLY)
+ return -EACCES;
+
+ return 0;
+}
+
+static int lxcGetMemCgroupSwapUsage(virCgroupPtr cgroup, unsigned long long *usage)
+{
+ return virCgroupGetMemSwapUsage(cgroup, usage);
+}
+
+static int lxcGetMemCgroupSwapTotal(virCgroupPtr cgroup, unsigned long long *total)
+{
+ return virCgroupGetMemSwapHardLimit(cgroup, total);
+}
+
+static int lxcGetMemCgroupMemUsage(virCgroupPtr cgroup, unsigned long long *usage)
+{
+ int ret;
+ unsigned long memUsage;
+
+ ret = virCgroupGetMemoryUsage(cgroup, &memUsage);
+ *usage = (unsigned long long) memUsage;
+
+ return ret;
+}
+
+static int lxcGetMemCgroupMemTotal(virCgroupPtr cgroup, unsigned long long *total)
{
- return -ENOENT;
+ return virCgroupGetMemoryHardLimit(cgroup, total);
}
-static int lxcProcRead(const char *path ATTRIBUTE_UNUSED,
- char *buf ATTRIBUTE_UNUSED,
- size_t size ATTRIBUTE_UNUSED,
- off_t offset ATTRIBUTE_UNUSED,
+static int lxcGetMemCgroupStat(virCgroupPtr cgroup, unsigned long long *meminfo)
+{
+ int ret = 0;
+ FILE *statfd = NULL;
+ char *statFile = NULL;
+ char line[1024];
+
+ ret = virCgroupPathOfController(cgroup, VIR_CGROUP_CONTROLLER_MEMORY,
+ "memory.stat", &statFile);
+ if (ret < 0 ) {
+ virReportSystemError(-ret, "%s",
+ _("cannot get the path of MEMORY cgroup controller"));
+ return ret;
+ }
+
+ statfd = fopen(statFile, "r");
+ if (statfd == NULL) {
+ ret = -ENOENT;
+ goto out_free;
+ }
+
+ while (fgets(line, sizeof(line), statfd) != NULL) {
+ char *value = strchr(line, ' ');
+ char *nl = value ? strchr(line, '\n') : NULL;
+ unsigned long long stat_value;
+
+ if (!value)
+ continue;
+
+ if (nl)
+ *nl = '\0';
+
+ *value = '\0';
+ if (strcmp(line, "cache") == 0) {
+ if ((ret = virStrToLong_ull(value + 1, NULL, 10, &stat_value)) < 0)
+ goto out;
+ meminfo[CACHED] = stat_value >> 10;
+ } else if (strcmp(line, "inactive_anon") == 0) {
+ if ((ret = virStrToLong_ull(value + 1, NULL, 10, &stat_value)) < 0)
+ goto out;
+ meminfo[INACTIVE_ANON] = stat_value >> 10;
+ } else if (strcmp(line, "active_anon") == 0) {
+ if ((ret = virStrToLong_ull(value + 1, NULL, 10, &stat_value)) < 0)
+ goto out;
+ meminfo[ACTIVE_ANON] = stat_value >> 10;
+ } else if (strcmp(line, "inactive_file") == 0) {
+ if ((ret = virStrToLong_ull(value + 1, NULL, 10, &stat_value)) < 0)
+ goto out;
+ meminfo[INACTIVE_FILE] = stat_value >> 10;
+ } else if (strcmp(line, "active_file") == 0) {
+ if ((ret = virStrToLong_ull(value + 1, NULL, 10, &stat_value)) < 0)
+ goto out;
+ meminfo[ACTIVE_FILE] = stat_value >> 10;
+ } else if (strcmp(line, "unevictable") == 0) {
+ if ((ret = virStrToLong_ull(value + 1, NULL, 10, &stat_value)) < 0)
+ goto out;
+ meminfo[UNEVICTABLE] = stat_value >> 10;
+ }
+ }
+ ret = 0;
+out:
+ pclose(statfd);
+out_free:
+ VIR_FREE(statFile);
+ return ret;
+}
+
+static int lxcGetMeminfo(virDomainDefPtr def, unsigned long long *meminfo)
+{
+ int ret;
+ virCgroupPtr driver;
+ virCgroupPtr cgroup;
+
+ ret = virCgroupForDriver("lxc", &driver, 1, 0);
+ if (ret < 0) {
+ virReportSystemError(-ret, "%s",
+ _("Unable to get cgroup for driver"));
+ return ret;
+ }
+
+ ret = virCgroupForDomain(driver, def->name, &cgroup, 0);
+ if (ret < 0) {
+ virReportSystemError(-ret, "%s",
+ _("Unable to get cgroup for domain"));
+ goto out_driver;
+ }
+
+ ret = lxcGetMemCgroupStat(cgroup, meminfo);
+ if (ret < 0) {
+ virReportSystemError(-ret, "%s",
+ _("Unable to get memory cgroup stat info\n"));
+ goto out;
+ }
+
+ ret = lxcGetMemCgroupMemTotal(cgroup, &meminfo[MEMTOTAL]);
+ if (ret < 0) {
+ virReportSystemError(-ret, "%s",
+ _("Unable to get memory cgroup total\n"));
+ goto out;
+ }
+
+ ret = lxcGetMemCgroupMemUsage(cgroup, &meminfo[MEMUSAGE]);
+ if (ret < 0) {
+ virReportSystemError(-ret, "%s",
+ _("Unable to get memory cgroup stat usage\n"));
+ goto out;
+ }
+
+ ret = lxcGetMemCgroupSwapTotal(cgroup, &meminfo[SWAPTOTAL]);
+ if (ret < 0) {
+ virReportSystemError(-ret, "%s",
+ _("Unable to get memory cgroup stat swaptotal\n"));
+ goto out;
+ }
+
+ ret = lxcGetMemCgroupSwapUsage(cgroup, &meminfo[SWAPUSAGE]);
+ if (ret < 0) {
+ virReportSystemError(-ret, "%s",
+ _("Unable to get memory cgroup stat swapusage\n"));
+ goto out;
+ }
+
+ ret = 0;
+out:
+ virCgroupFree(&cgroup);
+
+out_driver:
+ virCgroupFree(&driver);
+
+ return ret;
+}
+
+static int lxcProcReadMeminfo(char *hostpath, virDomainDefPtr def,
+ char *buf, size_t size, off_t offset)
+{
+ int res;
+ FILE *fd = NULL;
+ char line[1024];
+ unsigned long long meminfo[MEMMAX];
+
+ if ((res = lxcGetMeminfo(def, meminfo)) < 0) {
+ virReportSystemError(errno, "%s", _("Get Memory Cgroup info failed\n"));
+ return res;
+ }
+
+ fd = fopen(hostpath, "r");
+ if (fd == NULL) {
+ virReportSystemError(errno, "Cannot fopen %s\n", hostpath);
+ res = -errno;
+ goto out;
+ }
+
+ fseek(fd, offset, SEEK_SET);
+
+ while (res < size && fgets(line, sizeof(line), fd) != NULL) {
+ int len = 0;
+ char *new_line = NULL;
+ char *ptr = strchr(line, ':');
+ if (ptr) {
+ *ptr = '\0';
+ new_line = line;
+
+ if (strcmp(line, "MemTotal") == 0 &&
+ (def->mem.hard_limit || def->mem.max_balloon)) {
+ virAsprintf(&new_line, "MemTotal: %8llu KB\n",
+ meminfo[MEMTOTAL]);
+ } else if (strcmp(line, "MemFree") == 0 &&
+ (def->mem.hard_limit || def->mem.max_balloon)) {
+ virAsprintf(&new_line, "MemFree: %8llu KB\n",
+ (meminfo[MEMTOTAL] - meminfo[MEMUSAGE]));
+ } else if (strcmp(line, "Buffers") == 0) {
+ virAsprintf(&new_line, "Buffers: %8d KB\n", 0);
+ } else if (strcmp(line, "Cached") == 0 && meminfo[CACHED]) {
+ virAsprintf(&new_line, "Cached: %8llu KB\n",
+ meminfo[CACHED]);
+ } else if (strcmp(line, "Active") == 0 && meminfo[ACTIVE_ANON]) {
+ virAsprintf(&new_line, "Active: %8llu KB\n",
+ (meminfo[ACTIVE_ANON] + meminfo[ACTIVE_FILE]));
+ } else if (strcmp(line, "Inactive") == 0 && meminfo[INACTIVE_ANON]) {
+ virAsprintf(&new_line, "Inactive: %8llu KB\n",
+ (meminfo[INACTIVE_ANON] + meminfo[INACTIVE_FILE]));
+ } else if (strcmp(line, "Active(anon)") == 0 && meminfo[ACTIVE_ANON]) {
+ virAsprintf(&new_line, "Active(anon): %8llu KB\n",
+ meminfo[ACTIVE_ANON]);
+ } else if (strcmp(line, "Inactive(anon)") == 0 && meminfo[INACTIVE_ANON]) {
+ virAsprintf(&new_line, "Inactive(anon): %8llu KB\n",
+ meminfo[INACTIVE_ANON]);
+ } else if (strcmp(line, "Active(file)") == 0 && meminfo[ACTIVE_FILE]) {
+ virAsprintf(&new_line, "Active(file): %8llu KB\n",
+ meminfo[ACTIVE_FILE]);
+ } else if (strcmp(line, "Inactive(file)") == 0 && meminfo[INACTIVE_FILE]) {
+ virAsprintf(&new_line, "Inactive(file): %8llu KB\n",
+ meminfo[INACTIVE_FILE]);
+ } else if (strcmp(line, "Unevictable") == 0 && meminfo[UNEVICTABLE]) {
+ virAsprintf(&new_line, "Unevictable: %8llu KB\n",
+ meminfo[UNEVICTABLE]);
+ } else if (strcmp(line, "SwapTotal") == 0 && def->mem.swap_hard_limit) {
+ virAsprintf(&new_line, "SwapTotal: %8llu KB\n",
+ (meminfo[SWAPTOTAL] - meminfo[MEMTOTAL]));
+ } else if (strcmp(line, "SwapFree") == 0 && def->mem.swap_hard_limit) {
+ virAsprintf(&new_line, "SwapFree: %8llu KB\n",
+ (meminfo[SWAPTOTAL] - meminfo[MEMTOTAL]
+ - meminfo[SWAPUSAGE] + meminfo[MEMUSAGE]));
+ }
+ *ptr=':';
+ }
+
+ len = strlen(new_line);
+
+ if (res + len > size)
+ len = size - res;
+
+ memcpy(buf + res, new_line, len);
+ res += len;
+ memset(line, 0, sizeof(line));
+ if (new_line != line)
+ VIR_FREE(new_line);
+ }
+out:
+ VIR_FORCE_FCLOSE(fd);
+ return res;
+}
+
+static int lxcProcHostRead(char *path, char *buf, size_t size, off_t offset)
+{
+ int fd;
+ int res;
+ fd = open(path, O_RDONLY);
+ if (fd == -1)
+ return -errno;
+
+ res = pread(fd, buf, size, offset);
+ if (res == -1)
+ res = -errno;
+ close(fd);
+ return res;
+}
+
+static int lxcProcRead(const char *path,
+ char *buf,
+ size_t size,
+ off_t offset,
struct fuse_file_info *fi ATTRIBUTE_UNUSED)
{
- return -ENOENT;
+ int res = 0;
+ char *hostpath = NULL;
+ struct fuse_context *context = NULL;
+ virDomainDefPtr def = NULL;
+
+ if ((res = virAsprintf(&hostpath, "/proc/%s", path)) < 0) {
+ virReportSystemError(errno, "%s", _("Cannot get host path\n"));
+ return res;
+ }
+
+ context = fuse_get_context();
+ def = (virDomainDefPtr)context->private_data;
+
+ if (strcmp(path, meminfo_path) == 0) {
+ res = lxcProcReadMeminfo(hostpath, def, buf, size, offset);
+ } else
+ return -ENOENT;
+
+ if (res < 0) {
+ if((res = lxcProcHostRead(hostpath, buf, size, offset)) < 0)
+ virReportSystemError(errno, "%s", _("failed to show host's meminfo\n"));
+ }
+ VIR_FREE(hostpath);
+ return res;
}
static struct fuse_operations lxcProcOper = {
--
1.7.7.6
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