[PATCH v2] ACPI: Drop rcu usage for MMIO mappings

2020-05-07 Thread Dan Williams
Recently a performance problem was reported for a process invoking a non-trival ASL program. The method call in this case ends up repetitively triggering a call path like: acpi_ex_store acpi_ex_store_object_to_node acpi_ex_write_data_to_field acpi_ex_insert_into_field acpi_ex_w

Re: [PATCH] ACPI: Drop rcu usage for MMIO mappings

2020-05-07 Thread Dan Williams
On Thu, May 7, 2020 at 2:25 AM Andy Shevchenko wrote: > > On Thu, May 7, 2020 at 3:21 AM Dan Williams wrote: > > > > Recently a performance problem was reported for a process invoking a > > non-trival ASL program. The method call in this case ends up > > repetitively triggering a call path like:

Re: [PATCH] ACPI: Drop rcu usage for MMIO mappings

2020-05-07 Thread Dan Williams
On Thu, May 7, 2020 at 9:43 AM Rafael J. Wysocki wrote: > > On 5/7/2020 1:39 AM, Dan Williams wrote: > > Recently a performance problem was reported for a process invoking a > > non-trival ASL program. The method call in this case ends up > > repetitively triggering a call path like: > > > >

[PATCH] tools/testing/nvdimm: Replace zero-length array with flexible-array

2020-05-07 Thread Gustavo A. R. Silva
The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member[1][2], introduced in C99: struct foo { int stuff; struct boo array[]; }; By ma

Re: [PATCH] ACPI: Drop rcu usage for MMIO mappings

2020-05-07 Thread Rafael J. Wysocki
On 5/7/2020 1:39 AM, Dan Williams wrote: Recently a performance problem was reported for a process invoking a non-trival ASL program. The method call in this case ends up repetitively triggering a call path like: acpi_ex_store acpi_ex_store_object_to_node acpi_ex_write_data_to_fie

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Re: [PATCH] ACPI: Drop rcu usage for MMIO mappings

2020-05-07 Thread Andy Shevchenko
On Thu, May 7, 2020 at 3:21 AM Dan Williams wrote: > > Recently a performance problem was reported for a process invoking a > non-trival ASL program. The method call in this case ends up > repetitively triggering a call path like: > > acpi_ex_store > acpi_ex_store_object_to_node > acpi

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