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1431d9de00
Ashmem uses a single big mutex lock for all synchronization, and even uses it when no synchronization issues are present. The contention from using a single lock results in all-around poor performance. Rewrite to use fine-grained locks and atomic constructions to eliminate the big mutex lock, thereby improving performance greatly. In places where locks are needed for a one-time operation, we speculatively check if locking is needed while avoiding data races. The optional name fields are removed as well. Note that because asma->unpinned_list never has anything added to it, we can remove any code using it to clean up the driver a lot and reduce synchronization requirements. This also means that ashmem_lru_list never gets anything added to it either, so all code using it is dead code as well, which we can remove. Signed-off-by: Sultan Alsawaf <sultan@kerneltoast.com> Signed-off-by: Forenche <prahul2003@gmail.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.