[patch v12 06/13] procfs: add per-pid task isolation state

Marcelo Tosatti
2022-03-15T19:55:32Z

Add /proc/pid/task_isolation file, to query the state of
task isolation configuration.

---
fs/proc/base.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 68 insertions(+)

Index: linux-2.6/fs/proc/base.c
===================================================================
--- linux-2.6.orig/fs/proc/base.c
+++ linux-2.6/fs/proc/base.c
@@ -97,6 +97,8 @@
#include <linux/time_namespace.h>
#include <linux/resctrl.h>
#include <linux/cn_proc.h>
+#include <linux/prctl.h>
+#include <linux/task_isolation.h>
#include <trace/events/oom.h>
#include "internal.h"
#include "fd.h"
@@ -665,6 +667,69 @@ static int proc_pid_syscall(struct seq_f
}
#endif /* CONFIG_HAVE_ARCH_TRACEHOOK */

+#ifdef CONFIG_TASK_ISOLATION
+
+struct qoptions {
+ unsigned long mask;
+ char *name;
+};
+
+static struct qoptions iopts[] = {
+ {ISOL_F_QUIESCE, "quiesce"},
+};
+#define ILEN (sizeof(iopts) / sizeof(struct qoptions))
+
+static struct qoptions qopts[] = {
+ {ISOL_F_QUIESCE_VMSTATS, "vmstat_sync"},
+};
+#define QLEN (sizeof(qopts) / sizeof(struct qoptions))
+
+static void show_isolation_state(struct seq_file *m,
+ struct qoptions *iopt,
+ int mask,
+ const char *hdr)
+{
+ int i;
+
+ seq_printf(m, hdr);
+ for (i = 0; i < ILEN; i++) {
+ if (mask & iopt->mask)
+ seq_printf(m, "%s ", iopt->name);
+ iopt++;
+ }
+ if (mask == 0)
+ seq_printf(m, "none ");
+ seq_printf(m, "\n");
+}
+
+int proc_pid_task_isolation(struct seq_file *m, struct pid_namespace *ns,
+ struct pid *pid, struct task_struct *t)
+{
+ int active_mask, quiesce_mask, conf_mask;
+ struct task_isol_info *task_isol_info;
+ struct inode *inode = m->private;
+ struct task_struct *task = get_proc_task(inode);
+
+ task_isol_info = t->task_isol_info;
+ if (!task_isol_info)
+ active_mask = quiesce_mask = conf_mask = 0;
+ else {
+ active_mask = task_isol_info->active_mask;
+ quiesce_mask = task_isol_info->quiesce_mask;
+ conf_mask = task_isol_info->conf_mask;
+ }
+
+ show_isolation_state(m, iopts, conf_mask, "Configured state: ");
+ show_isolation_state(m, iopts, active_mask, "Active state: ");
+ show_isolation_state(m, qopts, quiesce_mask, "Quiescing: ");
+
+ put_task_struct(task);
+
+ return 0;
+}
+
+#endif /* CONFIG_TASK_ISOLATION */
+
/************************************************************************/
/* Here the fs part begins */
/************************************************************************/
@@ -3286,6 +3351,9 @@ static const struct pid_entry tgid_base_
#ifdef CONFIG_SECCOMP_CACHE_DEBUG
ONE("seccomp_cache", S_IRUSR, proc_pid_seccomp_cache),
#endif
+#ifdef CONFIG_TASK_ISOLATION
+ ONE("task_isolation", S_IRUSR, proc_pid_task_isolation),
+#endif
};

static int proc_tgid_base_readdir(struct file *file, struct dir_context *ctx)