From: "Luck, Tony" <tony.luck@intel.com>
To: Borislav Petkov <bp@alien8.de>
Cc: Fenghua Yu <fenghuay@nvidia.com>,
Reinette Chatre <reinette.chatre@intel.com>,
Maciej Wieczor-Retman <maciej.wieczor-retman@intel.com>,
Peter Newman <peternewman@google.com>,
James Morse <james.morse@arm.com>,
Babu Moger <babu.moger@amd.com>,
"Drew Fustini" <dfustini@baylibre.com>,
Dave Martin <Dave.Martin@arm.com>, Chen Yu <yu.c.chen@intel.com>,
<x86@kernel.org>, <linux-kernel@vger.kernel.org>,
<patches@lists.linux.dev>
Subject: Re: [PATCH v17 13/32] x86,fs/resctrl: Add an architectural hook called for each mount
Date: Mon, 5 Jan 2026 11:39:29 -0800 [thread overview]
Message-ID: <aVwTcX7V_HN2j6SW@agluck-desk3> (raw)
In-Reply-To: <20260105191711.GBaVwON5nZn-uO6Sqg@fat_crate.local>
On Mon, Jan 05, 2026 at 08:17:11PM +0100, Borislav Petkov wrote:
> On Wed, Dec 17, 2025 at 09:21:00AM -0800, Tony Luck wrote:
> > +void resctrl_arch_pre_mount(void)
> > +{
> > + static atomic_t only_once = ATOMIC_INIT(0);
> > + int old = 0;
> > +
> > + if (!atomic_try_cmpxchg(&only_once, &old, 1))
> > + return;
> > +}
>
> There's
>
> #define DO_ONCE(func, ...)
>
> Can't use that?
Learn something new every day. Yes, <linux/once.h> looks possible here.
Though I believe I'll need the DO_ONCE_SLEEPABLE() version since
resctrl_arch_pre_mount() grabs a mutex and various called functions
allocate memory using kmalloc().
-Tony
next prev parent reply other threads:[~2026-01-05 19:39 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-17 17:20 [PATCH v17 00/32] x86,fs/resctrl telemetry monitoring Tony Luck
2025-12-17 17:20 ` [PATCH v17 01/32] x86,fs/resctrl: Improve domain type checking Tony Luck
2025-12-17 17:20 ` [PATCH v17 02/32] x86/resctrl: Move L3 initialization into new helper function Tony Luck
2025-12-17 17:20 ` [PATCH v17 03/32] x86/resctrl: Refactor domain_remove_cpu_mon() ready for new domain types Tony Luck
2025-12-17 17:20 ` [PATCH v17 04/32] x86/resctrl: Clean up domain_remove_cpu_ctrl() Tony Luck
2025-12-17 17:20 ` [PATCH v17 05/32] x86,fs/resctrl: Refactor domain create/remove using struct rdt_domain_hdr Tony Luck
2025-12-17 17:20 ` [PATCH v17 06/32] fs/resctrl: Split L3 dependent parts out of __mon_event_count() Tony Luck
2025-12-17 17:20 ` [PATCH v17 07/32] x86,fs/resctrl: Use struct rdt_domain_hdr when reading counters Tony Luck
2025-12-17 17:20 ` [PATCH v17 08/32] x86,fs/resctrl: Rename struct rdt_mon_domain and rdt_hw_mon_domain Tony Luck
2025-12-17 17:20 ` [PATCH v17 09/32] x86,fs/resctrl: Rename some L3 specific functions Tony Luck
2025-12-17 17:20 ` [PATCH v17 10/32] fs/resctrl: Make event details accessible to functions when reading events Tony Luck
2025-12-17 17:20 ` [PATCH v17 11/32] x86,fs/resctrl: Handle events that can be read from any CPU Tony Luck
2025-12-17 17:20 ` [PATCH v17 12/32] x86,fs/resctrl: Support binary fixed point event counters Tony Luck
2025-12-17 17:21 ` [PATCH v17 13/32] x86,fs/resctrl: Add an architectural hook called for each mount Tony Luck
2026-01-05 19:17 ` Borislav Petkov
2026-01-05 19:39 ` Luck, Tony [this message]
2026-01-05 20:04 ` Borislav Petkov
2026-01-05 20:15 ` Luck, Tony
2026-01-07 17:29 ` Reinette Chatre
2026-01-07 18:05 ` Luck, Tony
2026-01-07 19:33 ` Reinette Chatre
2026-01-07 20:25 ` Luck, Tony
2026-01-07 22:09 ` Reinette Chatre
2026-01-07 22:27 ` Luck, Tony
2026-01-07 23:09 ` Reinette Chatre
2026-01-08 0:16 ` Luck, Tony
2026-01-08 2:42 ` Reinette Chatre
2025-12-17 17:21 ` [PATCH v17 14/32] x86,fs/resctrl: Add and initialize a resource for package scope monitoring Tony Luck
2025-12-17 17:21 ` [PATCH v17 15/32] fs/resctrl: Emphasize that L3 monitoring resource is required for summing domains Tony Luck
2025-12-17 17:21 ` [PATCH v17 16/32] x86/resctrl: Discover hardware telemetry events Tony Luck
2025-12-17 17:21 ` [PATCH v17 17/32] x86,fs/resctrl: Fill in details of events for guid 0x26696143 and 0x26557651 Tony Luck
2025-12-17 17:21 ` [PATCH v17 18/32] x86,fs/resctrl: Add architectural event pointer Tony Luck
2025-12-17 17:21 ` [PATCH v17 19/32] x86/resctrl: Find and enable usable telemetry events Tony Luck
2026-01-09 12:16 ` Borislav Petkov
2026-01-09 16:17 ` Reinette Chatre
2026-01-09 16:53 ` Luck, Tony
2026-01-09 22:01 ` Borislav Petkov
2025-12-17 17:21 ` [PATCH v17 20/32] x86/resctrl: Read " Tony Luck
2025-12-17 17:21 ` [PATCH v17 21/32] fs/resctrl: Refactor mkdir_mondata_subdir() Tony Luck
2025-12-17 17:21 ` [PATCH v17 22/32] fs/resctrl: Refactor rmdir_mondata_subdir_allrdtgrp() Tony Luck
2025-12-17 17:21 ` [PATCH v17 23/32] x86,fs/resctrl: Handle domain creation/deletion for RDT_RESOURCE_PERF_PKG Tony Luck
2025-12-17 17:21 ` [PATCH v17 24/32] x86/resctrl: Add energy/perf choices to rdt boot option Tony Luck
2026-01-09 22:16 ` Borislav Petkov
2026-01-09 22:20 ` Luck, Tony
2025-12-17 17:21 ` [PATCH v17 25/32] x86/resctrl: Handle number of RMIDs supported by RDT_RESOURCE_PERF_PKG Tony Luck
2025-12-17 17:21 ` [PATCH v17 26/32] fs/resctrl: Move allocation/free of closid_num_dirty_rmid[] Tony Luck
2025-12-17 17:21 ` [PATCH v17 27/32] x86,fs/resctrl: Compute number of RMIDs as minimum across resources Tony Luck
2025-12-17 17:21 ` [PATCH v17 28/32] fs/resctrl: Move RMID initialization to first mount Tony Luck
2025-12-17 17:21 ` [PATCH v17 29/32] x86/resctrl: Enable RDT_RESOURCE_PERF_PKG Tony Luck
2025-12-17 17:21 ` [PATCH v17 30/32] fs/resctrl: Provide interface to create architecture specific debugfs area Tony Luck
2026-01-10 10:57 ` Borislav Petkov
2026-01-10 19:13 ` Luck, Tony
2026-01-10 19:42 ` Borislav Petkov
2026-01-10 23:29 ` Luck, Tony
2025-12-17 17:21 ` [PATCH v17 31/32] x86/resctrl: Add debugfs files to show telemetry aggregator status Tony Luck
2025-12-17 17:21 ` [PATCH v17 32/32] x86,fs/resctrl: Update documentation for telemetry events Tony Luck
2025-12-17 22:16 ` [PATCH v17 00/32] x86,fs/resctrl telemetry monitoring Reinette Chatre
2026-01-04 6:14 ` Borislav Petkov
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