From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Dan Williams <dan.j.williams@intel.com>,
Erik Kaneda <erik.kaneda@intel.com>,
rafael.j.wysocki@intel.com, Len Brown <lenb@kernel.org>,
Borislav Petkov <bp@alien8.de>, Ira Weiny <ira.weiny@intel.com>,
James Morse <james.morse@arm.com>,
Myron Stowe <myron.stowe@redhat.com>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
linux-nvdimm@lists.01.org, Bob Moore <robert.moore@intel.com>
Subject: Re: [RFT][PATCH 0/3] ACPI: ACPICA / OSL: Avoid unmapping ACPI memory inside of the AML interpreter
Date: Sat, 13 Jun 2020 21:19:28 +0200 [thread overview]
Message-ID: <6131168.ASH3qCSnW2@kreacher> (raw)
In-Reply-To: <318372766.6LKUBsbRXE@kreacher>
On Wednesday, June 10, 2020 2:17:04 PM CEST Rafael J. Wysocki wrote:
> Hi All,
>
> This series is to address the problem with RCU synchronization occurring,
> possibly relatively often, inside of acpi_ex_system_memory_space_handler(),
> when the namespace and interpreter mutexes are held.
>
> The basic idea is to avoid the actual unmapping of memory in
> acpi_ex_system_memory_space_handler() by making it take the advantage of the
> reference counting of memory mappings utilized by the OSL layer in Linux.
>
> The basic assumption in patch [1/3] is that if the special
> ACPI_OS_MAP_MEMORY_FAST_PATH() macro is present, it can be used to increment
> the reference counter of a known-existing memory mapping in the OS layer
> which then is dropped by the subsequent acpi_os_unmap_memory() without
> unmapping the address range at hand. That can be utilized by
> acpi_ex_system_memory_space_handler() to prevent the reference counters of
> all mappings used by it from dropping down to 0 (which also prevents the
> address ranges associated with them from being unmapped) so that they can
> be unmapped later (specifically, at the operation region deactivation time).
>
> Patch [2/3] defers the unmapping even further, until the namespace and
> interpreter mutexes are released, to avoid invoking the RCU synchronization
> under theses mutexes.
>
> Finally, patch [3/3] changes the OS layer in Linux to provide the
> ACPI_OS_MAP_MEMORY_FAST_PATH() macro.
>
> Note that if this macro is not defined, the code works the way it used to.
>
> The series is available from the git branch at
>
> git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git \
> acpica-osl
>
> for easier testing.
Please disregard this patch series, it will be replaced by a new one which
already is there in the acpica-osl branch above.
Thanks!
next prev parent reply other threads:[~2020-06-13 19:19 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-07 23:39 [PATCH v2] ACPI: Drop rcu usage for MMIO mappings Dan Williams
2020-05-13 8:52 ` [ACPI] 5a91d41f89: BUG:sleeping_function_called_from_invalid_context_at_kernel/locking/mutex.c kernel test robot
2020-06-05 13:32 ` [PATCH v2] ACPI: Drop rcu usage for MMIO mappings Rafael J. Wysocki
2020-06-05 16:18 ` Dan Williams
2020-06-05 16:21 ` Rafael J. Wysocki
2020-06-05 16:39 ` Dan Williams
2020-06-05 17:02 ` Rafael J. Wysocki
2020-06-05 14:06 ` [RFT][PATCH] ACPI: OSL: Use rwlock instead of RCU for memory management Rafael J. Wysocki
2020-06-05 17:08 ` Dan Williams
2020-06-06 6:56 ` Rafael J. Wysocki
2020-06-08 15:33 ` Rafael J. Wysocki
2020-06-08 16:29 ` Rafael J. Wysocki
2020-06-05 19:40 ` Andy Shevchenko
2020-06-06 6:48 ` Rafael J. Wysocki
2020-06-10 12:17 ` [RFT][PATCH 0/3] ACPI: ACPICA / OSL: Avoid unmapping ACPI memory inside of the AML interpreter Rafael J. Wysocki
2020-06-10 12:20 ` [RFT][PATCH 1/3] ACPICA: Defer unmapping of memory used in memory opregions Rafael J. Wysocki
2020-06-10 12:21 ` [RFT][PATCH 2/3] ACPICA: Remove unused memory mappings on interpreter exit Rafael J. Wysocki
2020-06-12 0:12 ` Kaneda, Erik
2020-06-12 12:05 ` Rafael J. Wysocki
2020-06-13 19:28 ` Rafael J. Wysocki
2020-06-15 19:06 ` Dan Williams
2020-06-10 12:22 ` [RFT][PATCH 3/3] ACPI: OSL: Define ACPI_OS_MAP_MEMORY_FAST_PATH() Rafael J. Wysocki
2020-06-13 19:19 ` Rafael J. Wysocki [this message]
2020-06-22 13:50 ` [RFT][PATCH v2 0/4] ACPI: ACPICA / OSL: Avoid unmapping ACPI memory inside of the AML interpreter Rafael J. Wysocki
2020-06-22 13:52 ` [RFT][PATCH v2 1/4] ACPICA: Defer unmapping of opregion memory if supported by OS Rafael J. Wysocki
2020-06-22 13:53 ` [RFT][PATCH v2 2/4] ACPI: OSL: Add support for deferred unmapping of ACPI memory Rafael J. Wysocki
2020-06-22 14:56 ` Andy Shevchenko
2020-06-22 15:27 ` Rafael J. Wysocki
2020-06-22 15:46 ` Andy Shevchenko
2020-06-22 14:01 ` [RFT][PATCH v2 3/4] ACPICA: Preserve memory opregion mappings if supported by OS Rafael J. Wysocki
2020-06-26 22:53 ` Kaneda, Erik
2020-06-29 13:02 ` Rafael J. Wysocki
2020-06-22 14:02 ` [RFT][PATCH v2 4/4] ACPI: OSL: Implement acpi_os_map_memory_fast_path() Rafael J. Wysocki
2020-06-26 17:28 ` [RFT][PATCH v3 0/4] ACPI: ACPICA / OSL: Avoid unmapping ACPI memory inside of the AML interpreter Rafael J. Wysocki
2020-06-26 17:31 ` [RFT][PATCH v3 1/4] ACPICA: Take deferred unmapping of memory into account Rafael J. Wysocki
2020-06-26 17:31 ` [RFT][PATCH v3 2/4] ACPI: OSL: Implement deferred unmapping of ACPI memory Rafael J. Wysocki
2020-06-26 17:32 ` [RFT][PATCH v3 3/4] ACPICA: Preserve memory opregion mappings if supported by OS Rafael J. Wysocki
2020-06-26 17:33 ` [RFT][PATCH v3 4/4] ACPI: OSL: Implement acpi_os_map_memory_fast_path() Rafael J. Wysocki
2020-06-26 18:41 ` [RFT][PATCH v3 0/4] ACPI: ACPICA / OSL: Avoid unmapping ACPI memory inside of the AML interpreter Dan Williams
2020-06-28 17:09 ` Rafael J. Wysocki
2020-06-29 20:46 ` Dan Williams
2020-06-30 11:04 ` Rafael J. Wysocki
2020-06-29 16:31 ` [PATCH v4 0/2] " Rafael J. Wysocki
2020-06-29 16:33 ` [PATCH v4 1/2] ACPI: OSL: Implement deferred unmapping of ACPI memory Rafael J. Wysocki
2020-06-29 16:33 ` [PATCH v4 2/2] ACPICA: Preserve memory opregion mappings Rafael J. Wysocki
2020-06-29 20:57 ` Al Stone
2020-06-30 11:44 ` Rafael J. Wysocki
2020-06-30 15:31 ` Al Stone
2020-06-30 15:52 ` Rafael J. Wysocki
2020-06-30 19:57 ` Al Stone
2020-07-16 19:22 ` Verma, Vishal L
2020-07-19 19:14 ` Rafael J. Wysocki
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