2197bb60f8
Patch series "vma_start_write_killable"", v2. When we added the VMA lock, we made a major oversight in not adding a killable variant. That can run us into trouble where a thread takes the VMA lock for read (eg handling a page fault) and then goes out to lunch for an hour (eg doing reclaim). Another thread tries to modify the VMA, taking the mmap_lock for write, then attempts to lock the VMA for write. That blocks on the first thread, and ensures that every other page fault now tries to take the mmap_lock for read. Because everything's in an uninterruptible sleep, we can't kill the task, which makes me angry. This patchset just adds vma_start_write_killable() and converts one caller to use it. Most users are somewhat tricky to convert, so expect follow-up individual patches per call-site which need careful analysis to make sure we've done proper cleanup. This patch (of 2): The vma can be held read-locked for a substantial period of time, eg if memory allocation needs to go into reclaim. It's useful to be able to send fatal signals to threads which are waiting for the write lock. Link: https://lkml.kernel.org/r/20251110203204.1454057-1-willy@infradead.org Link: https://lkml.kernel.org/r/20251110203204.1454057-2-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Suren Baghdasaryan <surenb@google.com> Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com> Reviewed-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Chris Li <chriscli@google.com> Cc: Jann Horn <jannh@google.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Shakeel Butt <shakeel.butt@linux.dev> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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 reStructuredText 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.