[pve-devel] [PATCH pve-common 1/1] ProcFSTools: add read_pressure

[Alexandre Derumier <aderumier@odiso.com>]

read new /proc/pressure/(cpu,disk,io) introduced in kernel 4.20.

This give more granular informations than loadaverage.

Signed-off-by: Alexandre Derumier <aderumier@odiso.com>
---
 src/PVE/ProcFSTools.pm | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/src/PVE/ProcFSTools.pm b/src/PVE/ProcFSTools.pm
index 7cf1472..7687c13 100644
--- a/src/PVE/ProcFSTools.pm
+++ b/src/PVE/ProcFSTools.pm
@@ -132,6 +132,24 @@ sub read_loadavg {
     return wantarray ? (0, 0, 0) : 0;
 }
 
+sub read_pressure {
+
+    my $res = {};
+    foreach my $type (qw(cpu memory io)) {
+	if (my $fh = IO::File->new ("/proc/pressure/$type", "r")) {
+	    while (defined (my $line = <$fh>)) {
+		if ($line =~ /^(some|full)\s+avg10\=(\d+\.\d+)\s+avg60\=(\d+\.\d+)\s+avg300\=(\d+\.\d+)\s+total\=(\d+)/) {
+		    $res->{$type}->{$1}->{avg10} = $2;
+		    $res->{$type}->{$1}->{avg60} = $3;
+		    $res->{$type}->{$1}->{avg300} = $4;
+	        }
+	    }
+	    $fh->close;
+	}
+    }
+    return $res;
+}
+
 my $last_proc_stat;
 
 sub read_proc_stat {
-- 
2.20.1