b37d1c1898
PA-RISC uses a global spinlock to protect pagetable updates in the TLB fault handlers. When multiple cores are taking TLB faults simultaneously, the cache line containing the spinlock becomes a bottleneck. This patch embeds the spinlock in the top level page directory, so that every process has its own lock. It improves performance by 30% when doing parallel compilations. At least on the N class systems, only one PxTLB inter processor broadcast can be active at any one time on the Merced bus. If a Merced bus is found, this patch serializes the TLB flushes with the pa_tlb_flush_lock spinlock. v1: Initial patch by Mikulas v2: Added Merced detection by Helge v3: Revised TLB serialization by Dave & Helge Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: John David Anglin <dave.anglin@bell.net> Signed-off-by: Helge Deller <deller@gmx.de>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.