mirror of
https://github.com/torvalds/linux.git
synced 2026-11-10 17:11:02 +01:00
Linux kernel source tree
e21d451a82
While developing a 9P server (https://github.com/Barre/ZeroFS) and testing it under high-load, I was running into allocation failures. The failures occur even with plenty of free memory available because kmalloc requires contiguous physical memory. This results in errors like: ls: page allocation failure: order:7, mode:0x40c40(GFP_NOFS|__GFP_COMP) This patch introduces a transport capability flag (supports_vmalloc) that indicates whether a transport can work with vmalloc'd buffers (non-physically contiguous memory). Transports requiring DMA should leave this flag as false. The fd-based transports (tcp, unix, fd) set this flag to true, and p9_fcall_init will use kvmalloc instead of kmalloc for these transports. This allows the allocator to fall back to vmalloc when contiguous physical memory is not available. Additionally, if kmem_cache_alloc fails, the code falls back to kvmalloc for transports that support it. Signed-off-by: Pierre Barre <pierre@barre.sh> Reviewed-by: Christian Schoenebeck <linux_oss@crudebyte.com> Message-ID: <d2017c29-11fb-44a5-bd0f-4204329bbefb@app.fastmail.com> Signed-off-by: Dominique Martinet <asmadeus@codewreck.org> |
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .pylintrc | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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.