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X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Jun 2026 18:43:56.4712 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: X1+O8iOUPyG8AlG4CT2Ha/BIKT0d/KzdcrAy9D2tOsaT4XPdcPBzFAl7FEo/SI7Li5vE/5VK17BR0AUuoFhIdXbNt/vDXWSQUMRFgqAH78I= X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY1PR11MB7981 X-OriginatorOrg: intel.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260605_114406_708400_C2E200E1 X-CRM114-Status: GOOD ( 20.75 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Ben, On 5/15/26 7:06 AM, Ben Horgan wrote: > From: Dave Martin > > The control value parser for the MB resource currently coerces the > memory bandwidth percentage value from userspace to be an exact > multiple of the rdt_resource::resctrl_membw::bw_gran parameter. > > On MPAM systems, this results in somewhat worse-than-worst-case > rounding, since the bandwidth granularity advertised to resctrl by the > MPAM driver is in general only an approximation to the actual hardware > granularity on these systems, and the hardware bandwidth allocation > control value is not natively a percentage -- necessitating a further > conversion in the resctrl_arch_update_domains() path, regardless of the > conversion done at parse time. > > For MPAM and x86 use their custom pre-prepared parse-time conversion, > resctrl_arch_preconvert_bw(). This will avoid accumulated error > from rounding the value twice on MPAM systems. For x86 systems there > is no functional change. > > Clarify the documentation, but avoid overly exact promises. > > Clamping to bw_min and bw_max still feels generic: leave it in the core > code, for now. Same comment as v2: please use max line length available. Some more context here: When resctrl patches are formatted as above the x86 maintainers end up reformatting them if they can afford to spend the time doing so. Having changelog formatted correctly from beginning avoids this extra churn. You can find related comment from Boris at https://lore.kernel.org/lkml/20250916105447.GCaMlB976WLxHHeNMD@fat_crate.local/ ... > diff --git a/fs/resctrl/ctrlmondata.c b/fs/resctrl/ctrlmondata.c > index 9a7dfc48cb2e..934e12f5d145 100644 > --- a/fs/resctrl/ctrlmondata.c > +++ b/fs/resctrl/ctrlmondata.c > @@ -37,8 +37,8 @@ typedef int (ctrlval_parser_t)(struct rdt_parse_data *data, > /* > * Check whether MBA bandwidth percentage value is correct. The value is > * checked against the minimum and max bandwidth values specified by the > - * hardware. The allocated bandwidth percentage is rounded to the next > - * control step available on the hardware. > + * hardware. The allocated bandwidth percentage is converted as > + * appropriate for consumption by the specific hardware driver. Same comment as v2: Adjusting right margin mid-paragraph looks awkward. > */ > static bool bw_validate(char *buf, u32 *data, struct rdt_resource *r) > { > @@ -71,7 +71,7 @@ static bool bw_validate(char *buf, u32 *data, struct rdt_resource *r) > return false; > } > > - *data = roundup(bw, (unsigned long)r->membw.bw_gran); > + *data = resctrl_arch_preconvert_bw(bw, r); > return true; > } > With line lengths adjusted (and rebased on patch #1 proposed changes): | Reviewed-by: Reinette Chatre Reinette