From: "Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>
To: Reinette Chatre <reinette.chatre@intel.com>
Cc: linux-kselftest@vger.kernel.org,
Fenghua Yu <fenghua.yu@intel.com>, Shuah Khan <shuah@kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Subject: Re: [PATCH v2 17/24] selftests/resctrl: Replace count_bits with count_consecutive_bits()
Date: Tue, 25 Apr 2023 14:41:48 +0300 (EEST) [thread overview]
Message-ID: <7bb3f116-2f4d-b81a-3f49-dae7175e82c1@linux.intel.com> (raw)
In-Reply-To: <455c986a-0d51-0302-d5c3-c6c0f1cc6bad@intel.com>
[-- Attachment #1: Type: text/plain, Size: 973 bytes --]
On Fri, 21 Apr 2023, Reinette Chatre wrote:
> On 4/18/2023 4:44 AM, Ilpo Järvinen wrote:
> > CAT and CMT tests depends on masks being continuous.
>
> The term used in the spec is "contiguous", using it here
> may help to convey the goal.
>
> >
> > Replace count_bits with more appropriate variant that counts
> > consecutive bits.
>
> Could you please elaborate why this is more appropriate and
> why this is necessary? What is wrong with current solution?
>
> Please note that cbm_mask in resctrl will always be contiguous.
Hi,
It's good that you asked this question.
This comes from a change (not by me originally) that also excluded the
shareable bits from the mask the CAT test uses. I assumed (w/o better
knowledge) that those shareable bits could create a hole into the mask.
It could be wrong assumption and the shareable bits are always at one end
of the CBM mask.
Do you happen to know how the shareable bits are positioned within the
mask?
--
i.
next prev parent reply other threads:[~2023-04-25 11:41 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-18 11:44 [PATCH v2 00/24] selftests/resctrl: Fixes, cleanups, and rewritten CAT test Ilpo Järvinen
2023-04-18 11:44 ` [PATCH v2 01/24] selftests/resctrl: Add resctrl.h into build deps Ilpo Järvinen
2023-04-22 0:07 ` Reinette Chatre
2023-04-18 11:44 ` [PATCH v2 02/24] selftests/resctrl: Check also too low values for CBM bits Ilpo Järvinen
2023-04-22 0:08 ` Reinette Chatre
2023-04-24 10:46 ` Ilpo Järvinen
2023-04-18 11:44 ` [PATCH v2 03/24] selftests/resctrl: Move resctrl FS mount/umount to higher level Ilpo Järvinen
2023-04-22 0:09 ` Reinette Chatre
2023-04-24 14:58 ` Ilpo Järvinen
2023-04-18 11:44 ` [PATCH v2 04/24] selftests/resctrl: Remove mum_resctrlfs Ilpo Järvinen
2023-04-22 0:11 ` Reinette Chatre
2023-04-24 14:55 ` Ilpo Järvinen
2023-04-18 11:44 ` [PATCH v2 05/24] selftests/resctrl: Make span unsigned long everywhere Ilpo Järvinen
2023-04-22 0:12 ` Reinette Chatre
2023-04-24 15:05 ` Ilpo Järvinen
2023-04-18 11:44 ` [PATCH v2 06/24] selftests/resctrl: Express span in bytes Ilpo Järvinen
2023-04-22 0:12 ` Reinette Chatre
2023-04-24 15:31 ` Ilpo Järvinen
2023-04-18 11:44 ` [PATCH v2 07/24] selftests/resctrl: Remove duplicated preparation for span arg Ilpo Järvinen
2023-04-22 0:14 ` Reinette Chatre
2023-04-24 15:41 ` Ilpo Järvinen
2023-04-18 11:44 ` [PATCH v2 08/24] selftests/resctrl: Don't use variable argument list for ->setup() Ilpo Järvinen
2023-04-18 11:44 ` [PATCH v2 09/24] selftests/resctrl: Remove "malloc_and_init_memory" param from run_fill_buf() Ilpo Järvinen
2023-04-18 11:44 ` [PATCH v2 10/24] selftests/resctrl: Split run_fill_buf() to alloc, work, and dealloc helpers Ilpo Järvinen
2023-04-22 0:16 ` Reinette Chatre
2023-04-24 16:01 ` Ilpo Järvinen
2023-04-24 16:32 ` Reinette Chatre
2023-04-18 11:44 ` [PATCH v2 11/24] selftests/resctrl: Remove start_buf local variable from buffer alloc func Ilpo Järvinen
2023-04-22 0:16 ` Reinette Chatre
2023-04-18 11:44 ` [PATCH v2 12/24] selftests/resctrl: Don't pass test name to fill_buf Ilpo Järvinen
2023-04-18 11:44 ` [PATCH v2 13/24] selftests/resctrl: Add flush_buffer() " Ilpo Järvinen
2023-04-22 0:16 ` Reinette Chatre
2023-04-18 11:44 ` [PATCH v2 14/24] selftests/resctrl: Remove test type checks from cat_val() Ilpo Järvinen
2023-04-18 11:44 ` [PATCH v2 15/24] selftests/resctrl: Refactor get_cbm_mask() Ilpo Järvinen
2023-04-22 0:17 ` Reinette Chatre
2023-05-31 6:03 ` Shaopeng Tan (Fujitsu)
2023-05-31 9:24 ` Ilpo Järvinen
2023-04-18 11:44 ` [PATCH v2 16/24] selftests/resctrl: Create cache_alloc_size() helper Ilpo Järvinen
2023-04-22 0:19 ` Reinette Chatre
2023-04-24 16:28 ` Ilpo Järvinen
2023-04-24 16:45 ` Reinette Chatre
2023-04-18 11:44 ` [PATCH v2 17/24] selftests/resctrl: Replace count_bits with count_consecutive_bits() Ilpo Järvinen
2023-04-22 0:20 ` Reinette Chatre
2023-04-25 11:41 ` Ilpo Järvinen [this message]
2023-04-25 14:28 ` Reinette Chatre
2023-05-31 7:25 ` Shaopeng Tan (Fujitsu)
2023-05-31 9:35 ` Ilpo Järvinen
2023-06-01 6:20 ` Shaopeng Tan (Fujitsu)
2023-04-18 11:45 ` [PATCH v2 18/24] selftests/resctrl: Exclude shareable bits from schemata in CAT test Ilpo Järvinen
2023-04-18 11:45 ` [PATCH v2 19/24] selftests/resctrl: Pass the real number of tests to show_cache_info() Ilpo Järvinen
2023-04-22 0:20 ` Reinette Chatre
2023-04-18 11:45 ` [PATCH v2 20/24] selftests/resctrl: Move CAT/CMT test global vars to func they are used Ilpo Järvinen
2023-04-22 0:20 ` Reinette Chatre
2023-04-18 11:45 ` [PATCH v2 21/24] selftests/resctrl: Read in less obvious order to defeat prefetch optimizations Ilpo Järvinen
2023-05-31 5:33 ` Shaopeng Tan (Fujitsu)
2023-05-31 9:17 ` Ilpo Järvinen
2023-06-01 6:15 ` Shaopeng Tan (Fujitsu)
2023-06-02 13:51 ` Ilpo Järvinen
2023-06-02 14:39 ` Reinette Chatre
2023-06-14 13:02 ` Ilpo Järvinen
2023-06-16 5:30 ` Shaopeng Tan (Fujitsu)
2023-06-16 6:44 ` Ilpo Järvinen
2023-04-18 11:45 ` [PATCH v2 22/24] selftests/resctrl: Split measure_cache_vals() function Ilpo Järvinen
2023-04-22 0:21 ` Reinette Chatre
2023-04-18 11:45 ` [PATCH v2 23/24] selftests/resctrl: Split show_cache_info() to test specific and generic parts Ilpo Järvinen
2023-04-22 0:22 ` Reinette Chatre
2023-04-18 11:45 ` [PATCH v2 24/24] selftests/resctrl: Rewrite Cache Allocation Technology (CAT) test Ilpo Järvinen
2023-04-22 0:32 ` Reinette Chatre
2023-04-26 13:58 ` Ilpo Järvinen
2023-04-26 23:35 ` Reinette Chatre
2023-04-27 8:04 ` Ilpo Järvinen
2023-04-27 15:15 ` Reinette Chatre
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