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8cd3fa428b
Now we will freeze slabs when moving them out of node partial list to cpu partial list, this method needs two cmpxchg_double operations: 1. freeze slab (acquire_slab()) under the node list_lock 2. get_freelist() when pick used in ___slab_alloc() Actually we don't need to freeze when moving slabs out of node partial list, we can delay freezing to when use slab freelist in ___slab_alloc(), so we can save one cmpxchg_double(). And there are other good points: - The moving of slabs between node partial list and cpu partial list becomes simpler, since we don't need to freeze or unfreeze at all. - The node list_lock contention would be less, since we don't need to freeze any slab under the node list_lock. We can achieve this because there is no concurrent path would manipulate the partial slab list except the __slab_free() path, which is now serialized by slab_test_node_partial() under the list_lock. Since the slab returned by get_partial() interfaces is not frozen anymore and no freelist is returned in the partial_context, so we need to use the introduced freeze_slab() to freeze it and get its freelist. Similarly, the slabs on the CPU partial list are not frozen anymore, we need to freeze_slab() on it before use. We can now delete acquire_slab() as it became unused. Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com> Reviewed-by: Vlastimil Babka <vbabka@suse.cz> Tested-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Signed-off-by: Vlastimil Babka <vbabka@suse.cz> |
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| 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 | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .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 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.