[Devel] [PATCH RHEL COMMIT] ve: Virtualize sysinfo

[Konstantin Khorenko]

The commit is pushed to "branch-rh9-5.14.vz9.1.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after ark-5.14
------>
commit 1cff665255f838863241ebf04bad5442157f9516
Author: Kirill Tkhai <ktkhai at virtuozzo.com>
Date:   Fri Oct 1 19:38:38 2021 +0300

    ve: Virtualize sysinfo
    
    Extracted from "Initial patch".
    
    Signed-off-by: Kirill Tkhai <ktkhai at virtuozzo.com>
    
    (cherry picked from vz7 commit e55cd51304b3271a2adaf43de9b9a5a7be34541e)
    Signed-off-by: Konstantin Khorenko <khorenko at virtuozzo.com>
    
    Port to vz8 notes:
    * virtinfo_notifier_call (bc_fill_sysinfo()) is substituted by
      direct call to si_meminfo_ve() and only for not VE0.
    * "avenrun" is not virtualized yet - need to port first commit
      715f311fdb4a ("sched: Account task_group::cpustat,taskstats,avenrun")
    * ve_struct.real_start_time is u64 now instead of timespec
    
    Cherry-picked from vz8 commit a93d11cae4cc ("ve: Virtualize sysinfo").
    Followed ve->real_start_time -> ve->start_boottime rename.
    
    Signed-off-by: Nikita Yushchenko <nikita.yushchenko at virtuozzo.com>
---
 kernel/sys.c | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/kernel/sys.c b/kernel/sys.c
index da8e44e1525d..1943af548f59 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -2588,6 +2588,8 @@ SYSCALL_DEFINE3(getcpu, unsigned __user *, cpup, unsigned __user *, nodep,
 	return err ? -EFAULT : 0;
 }
 
+extern void si_meminfo_ve(struct sysinfo *si, struct ve_struct *ve);
+
 /**
  * do_sysinfo - fill in sysinfo struct
  * @info: pointer to buffer to fill
@@ -2597,19 +2599,29 @@ static int do_sysinfo(struct sysinfo *info)
 	unsigned long mem_total, sav_total;
 	unsigned int mem_unit, bitcount;
 	struct timespec64 tp;
+	struct ve_struct *ve;
 
 	memset(info, 0, sizeof(struct sysinfo));
 
+	si_meminfo(info);
+	si_swapinfo(info);
+
 	ktime_get_boottime_ts64(&tp);
 	timens_add_boottime(&tp);
-	info->uptime = tp.tv_sec + (tp.tv_nsec ? 1 : 0);
 
-	get_avenrun(info->loads, 0, SI_LOAD_SHIFT - FSHIFT);
+	ve = get_exec_env();
+	if (ve_is_super(ve)) {
+		info->uptime = tp.tv_sec + (tp.tv_nsec ? 1 : 0);
+		get_avenrun(info->loads, 0, SI_LOAD_SHIFT - FSHIFT);
 
-	info->procs = nr_threads;
+		info->procs = nr_threads;
+	} else {
+		si_meminfo_ve(info, ve);
+		info->uptime = tp.tv_sec + (tp.tv_nsec ? 1 : 0) -
+			       ve->start_boottime / NSEC_PER_SEC;
 
-	si_meminfo(info);
-	si_swapinfo(info);
+		info->procs = nr_threads_ve(ve);
+	}
 
 	/*
 	 * If the sum of all the available memory (i.e. ram + swap)