arch/x86/resctrl.rst

272 	# echo L3:0=f7 > schemata
287 resource (see "schemata" below). The root and these additional top level
343 "schemata":
348 	Mirrors the display of the "schemata" file to display the size in
358 	pseudo-locked region's schemata to the resource group's "schemata"
393 1) If the task is a member of a non-default group, then the schemata
397    CPU that is assigned to some specific group, then the schemata for the
400 3) Otherwise the schemata for the default group is used.
569 By default, the schemata would take the bandwidth percentage values
571 a mount option 'mba_MBps'. The schemata format is specified in the below
574 L3 schemata file details (code and data prioritization disabled)
576 With CDP disabled the L3 schemata format is::
580 L3 schemata file details (CDP enabled via mount option to resctrl)
588 L2 schemata file details
590 CDP is supported at L2 using the 'cdpl2' mount option. The schemata
630 The bandwidth domain for slow memory is L3 cache. Its schemata file
636 Reading/writing the schemata file
638 Reading the schemata file will show the state of all resources
643   # cat schemata
646   # echo "L3DATA:2=3c0;" > schemata
647   # cat schemata
651 Reading/writing the schemata file (on AMD systems)
653 Reading the schemata file will show the current bandwidth limit on all
662   # cat schemata
666   # echo "MB:1=16" > schemata
667   # cat schemata
671 Reading/writing the schemata file (on AMD systems) with SMBA feature
673 Reading and writing the schemata file is the same as without SMBA in
680   # cat schemata
685   # echo "SMBA:1=64" > schemata
686   # cat schemata
704 from the user to do so that is accompanied by a schemata of the region
707 - Create a CAT allocation CLOSNEW with a CBM matching the schemata
760 3) Write the schemata of the pseudo-locked region to the "schemata" file. All
761    bits within the schemata should be "unused" according to the "bit_usage"
885   # echo "L3:0=3;1=c\nMB:0=50;1=50" > /sys/fs/resctrl/p0/schemata
886   # echo "L3:0=3;1=3\nMB:0=50;1=50" > /sys/fs/resctrl/p1/schemata
889 of all caches (its schemata file reads "L3:0=f;1=f").
907   # echo "L3:0=3;1=c\nMB:0=1024;1=500" > /sys/fs/resctrl/p0/schemata
908   # echo "L3:0=3;1=3\nMB:0=1024;1=500" > /sys/fs/resctrl/p1/schemata
926 First we reset the schemata for the default group so that the "upper"
930   # echo "L3:0=3ff;1=fffff\nMB:0=50;1=100" > schemata
937   # echo "L3:0=f8000;1=fffff" > p0/schemata
951   # echo "L3:0=7c00;1=fffff" > p1/schemata
956 schemata would look like(Assume min_bandwidth 10 and bandwidth_gran is
962   # echo -e "L3:0=f8000;1=fffff\nMB:0=20;1=100" > p0/schemata
968   # echo -e "L3:0=f8000;1=fffff\nMB:0=20;1=100" > p0/schemata
982 First we reset the schemata for the default group so that the "upper"
986   # echo "L3:0=3ff\nMB:0=50" > schemata
994   # echo "L3:0=ffc00\nMB:0=50" > p0/schemata
1023   # cat schemata
1027 fail because of the overlap with the schemata of the default group::
1030   # echo 'L2:0=0x3;1=0x3' > p0/schemata
1036   schemata overlaps
1039 resource group's schemata has to change, making it possible for the new
1043   # echo 'L2:0=0xfc;1=0xfc' > schemata
1048   p0/schemata:L2:0=03;1=03
1058   p1/schemata:L2:0=fc;1=fc
1068   # echo 'L2:0=0x1;1=0x1' > p1/schemata
1085 removed from the default resource group's schemata::
1089   # echo 'L2:1=0xfc' > schemata
1099   # echo 'L2:1=0x3' > newlock/schemata
1191   4. Set the bits found in step 2 to the new directory "schemata" file
1226   echo mask > /sys/fs/resctrl/newres/schemata
1310   # echo "L3:0=3;1=c" > /sys/fs/resctrl/p0/schemata
1311   # echo "L3:0=3;1=3" > /sys/fs/resctrl/p1/schemata
1316 of all caches (its schemata file reads "L3:0=f;1=f").