[PATCH 4.19 054/346] x86/resctrl: Fix incorrect local bandwidth when mba_sc is enabled

Greg Kroah-Hartman
2020-12-28T16:11:45Z

From: Xiaochen Shen <xiaochen.shen@intel.com>

commit 06c5fe9b12dde1b62821f302f177c972bb1c81f9 upstream

The MBA software controller (mba_sc) is a feedback loop which
periodically reads MBM counters and tries to restrict the bandwidth
below a user-specified value. It tags along the MBM counter overflow
handler to do the updates with 1s interval in mbm_update() and
update_mba_bw().

The purpose of mbm_update() is to periodically read the MBM counters to
make sure that the hardware counter doesn't wrap around more than once
between user samplings. mbm_update() calls __mon_event_count() for local
bandwidth updating when mba_sc is not enabled, but calls mbm_bw_count()
instead when mba_sc is enabled. __mon_event_count() will not be called
for local bandwidth updating in MBM counter overflow handler, but it is
still called when reading MBM local bandwidth counter file
'mbm_local_bytes', the call path is as below:

rdtgroup_mondata_show()
mon_event_read()
mon_event_count()
__mon_event_count()

In __mon_event_count(), m->chunks is updated by delta chunks which is
calculated from previous MSR value (m->prev_msr) and current MSR value.
When mba_sc is enabled, m->chunks is also updated in mbm_update() by
mistake by the delta chunks which is calculated from m->prev_bw_msr
instead of m->prev_msr. But m->chunks is not used in update_mba_bw() in
the mba_sc feedback loop.

When reading MBM local bandwidth counter file, m->chunks was changed
unexpectedly by mbm_bw_count(). As a result, the incorrect local
bandwidth counter which calculated from incorrect m->chunks is shown to
the user.

Fix this by removing incorrect m->chunks updating in mbm_bw_count() in
MBM counter overflow handler, and always calling __mon_event_count() in
mbm_update() to make sure that the hardware local bandwidth counter
doesn't wrap around.

Test steps:
# Run workload with aggressive memory bandwidth (e.g., 10 GB/s)
git clone https://github.com/intel/intel-cmt-cat && cd intel-cmt-cat
&& make
./tools/membw/membw -c 0 -b 10000 --read

# Enable MBA software controller
mount -t resctrl resctrl -o mba_MBps /sys/fs/resctrl

# Create control group c1
mkdir /sys/fs/resctrl/c1

# Set MB throttle to 6 GB/s
echo "MB:0=6000;1=6000" > /sys/fs/resctrl/c1/schemata

# Write PID of the workload to tasks file
echo `pidof membw` > /sys/fs/resctrl/c1/tasks

# Read local bytes counters twice with 1s interval, the calculated
# local bandwidth is not as expected (approaching to 6 GB/s):
local_1=`cat /sys/fs/resctrl/c1/mon_data/mon_L3_00/mbm_local_bytes`
sleep 1
local_2=`cat /sys/fs/resctrl/c1/mon_data/mon_L3_00/mbm_local_bytes`
echo "local b/w (bytes/s):" `expr $local_2 - $local_1`

Before fix:
local b/w (bytes/s): 11076796416

After fix:
local b/w (bytes/s): 5465014272

Fixes: ba0f26d8529c (x86/intel_rdt/mba_sc: Prepare for feedback loop)
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Cc: <stable@vger.kernel.org>
Link: https://lkml.kernel.org/r/1607063279-19437-1-git-send-email-xiaochen.shen@intel.com
[sudip: manual backport to file at old path]
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/x86/kernel/cpu/intel_rdt_monitor.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)

--- a/arch/x86/kernel/cpu/intel_rdt_monitor.c
+++ b/arch/x86/kernel/cpu/intel_rdt_monitor.c
@@ -290,7 +290,6 @@ static void mbm_bw_count(u32 rmid, struc
return;

chunks = mbm_overflow_count(m->prev_bw_msr, tval);
- m->chunks += chunks;
cur_bw = (chunks * r->mon_scale) >> 20;

if (m->delta_comp)
@@ -460,15 +459,14 @@ static void mbm_update(struct rdt_domain
}
if (is_mbm_local_enabled()) {
rr.evtid = QOS_L3_MBM_LOCAL_EVENT_ID;
+ __mon_event_count(rmid, &rr);

/*
* Call the MBA software controller only for the
* control groups and when user has enabled
* the software controller explicitly.
*/
- if (!is_mba_sc(NULL))
- __mon_event_count(rmid, &rr);
- else
+ if (is_mba_sc(NULL))
mbm_bw_count(rmid, &rr);
}
}