9debe341d5
Extend filemap_fault() to handle speculative faults. In the speculative case, we will only be fishing existing pages out of the page cache. The logic we use mirrors what is done in the non-speculative case, assuming that pages are found in the page cache, are up to date and not already locked, and that readahead is not necessary at this time. In all other cases, the fault is aborted to be handled non-speculatively. Signed-off-by: Michel Lespinasse <michel@lespinasse.org> Link: https://lore.kernel.org/all/20210407014502.24091-26-michel@lespinasse.org/ Conflicts: mm/filemap.c 1. Added back file_ra_state variable used by SPF path. 2. Updated comment for filemap_fault to reflect SPF locking rules. Bug: 161210518 Signed-off-by: Suren Baghdasaryan <surenb@google.com> Change-Id: I82eba7fcfc81876245c2e65bc5ae3d33ddfcc368 Git-commit: 59d4d125b7d0108b54860ea8584679d514ef07b0 Git-repo: https://android.googlesource.com/kernel/common/ [quic_c_spathi@quicinc.com: resolve trivial merge conflicts] Signed-off-by: Srinivasarao Pathipati <quic_c_spathi@quicinc.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.