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charset="iso-2022-jp" Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-OriginatorOrg: fujitsu.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: OSZPR01MB8798.jpnprd01.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 345e2d40-c618-415f-a0cc-08de541da8a5 X-MS-Exchange-CrossTenant-originalarrivaltime: 15 Jan 2026 10:05:49.3264 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: a19f121d-81e1-4858-a9d8-736e267fd4c7 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: Z2fAWToYh+9loa6kiAzz8gkLmcKenrfDOXoE9NtQDtKWf+eT3mFq2SPSLYUxQGhoLa7+/hZUSRoH6U8OsLe0JP1H7Z5JDlBrliECv4GR1zs= X-MS-Exchange-Transport-CrossTenantHeadersStamped: TYRPR01MB14272 Hello Ben,=0A= =0A= > From: James Morse =0A= > =0A= > resctrl's limbo code needs to be told when the data left in a cache is=0A= > small enough for the partid+pmg value to be re-allocated.=0A= > =0A= > x86 uses the cache size divided by the number of rmid users the cache may= =0A= > have. Do the same, but for the smallest cache, and with the number of=0A= > partid-and-pmg users.=0A= > =0A= > Reviewed-by: Jonathan Cameron =0A= > Signed-off-by: James Morse =0A= > Signed-off-by: Ben Horgan =0A= > ---=0A= > Changes since v2:=0A= > Move waiting for cache info into it's own patch=0A= > ---=0A= > drivers/resctrl/mpam_resctrl.c | 35 ++++++++++++++++++++++++++++++++++= =0A= > 1 file changed, 35 insertions(+)=0A= > =0A= > diff --git a/drivers/resctrl/mpam_resctrl.c b/drivers/resctrl/mpam_resctr= l.c=0A= > index 5adc78f9c96f..a6be3ce84241 100644=0A= > --- a/drivers/resctrl/mpam_resctrl.c=0A= > +++ b/drivers/resctrl/mpam_resctrl.c=0A= > @@ -561,6 +561,38 @@ void resctrl_arch_reset_cntr(struct rdt_resource *r,= struct rdt_mon_domain *d,=0A= > reset_mon_cdp_safe(mon, mon_comp, USE_PRE_ALLOCATED, closid, rmi= d);=0A= > }=0A= > =0A= > +/*=0A= > + * The rmid realloc threshold should be for the smallest cache exposed t= o=0A= > + * resctrl.=0A= > + */=0A= > +static int update_rmid_limits(struct mpam_class *class)=0A= > +{=0A= > + u32 num_unique_pmg =3D resctrl_arch_system_num_rmid_idx();=0A= > + struct mpam_props *cprops =3D &class->props;=0A= > + struct cacheinfo *ci;=0A= > +=0A= > + lockdep_assert_cpus_held();=0A= > +=0A= > + /* Assume cache levels are the same size for all CPUs... */=0A= > + ci =3D get_cpu_cacheinfo_level(smp_processor_id(), class->level);= =0A= > + if (!ci || ci->size =3D=3D 0) {=0A= > + pr_debug("Could not read cache size for class %u\n",=0A= > + class->level);=0A= > + return -EINVAL;=0A= > + }=0A= > +=0A= > + if (!mpam_has_feature(mpam_feat_msmon_csu, cprops))=0A= > + return 0;=0A= =0A= Shouldn't it be return -EOPNOTSUPP;?=0A= =0A= However, before the function update_rmid_limits() is called, there is a che= ck: if (cache_has_usable_csu(class) && topology_matches_l3(class)).=0A= cache_has_usable_csu(class) already contains an identical check. Therefore,= I think it's safe to remove this redundant one.=0A= =0A= Best regards,=0A= Shaopeng TAN=0A= =0A= > + if (!resctrl_rmid_realloc_limit ||=0A= > + ci->size < resctrl_rmid_realloc_limit) {=0A= > + resctrl_rmid_realloc_limit =3D ci->size;=0A= > + resctrl_rmid_realloc_threshold =3D ci->size / num_unique_= pmg;=0A= > + }=0A= > +=0A= > + return 0;=0A= > +}=0A= > +=0A= > static bool cache_has_usable_cpor(struct mpam_class *class)=0A= > {=0A= > struct mpam_props *cprops =3D &class->props;=0A= > @@ -1006,6 +1038,9 @@ static void mpam_resctrl_pick_counters(void)=0A= > /* CSU counters only make sense on a cache. */= =0A= > switch (class->type) {=0A= > case MPAM_CLASS_CACHE:=0A= > + if (update_rmid_limits(class))=0A= > + continue;=0A= > +=0A= > counter_update_class(QOS_L3_OCCUP_EVENT_= ID, class);=0A= > break;=0A= > default:=0A= > --=0A= > 2.43.0=0A=