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Revert commit8014c46ad9("slub: use alloc_pages_node() in alloc_slab_page()"). The patch disabled the numa policy support in the slab allocator. It did not consider that alloc_pages() uses memory policies but alloc_pages_node() does not. As a result of this patch slab memory allocations are no longer spread via interleave policy across all available NUMA nodes on bootup. Instead all slab memory is allocated close to the boot processor. This leads to an imbalance of memory accesses on NUMA systems. Also applications using MPOL_INTERLEAVE as a memory policy will no longer spread slab allocations over all nodes in the interleave set but allocate memory locally. This may also result in unbalanced allocations on a single numa node. SLUB does not apply memory policies to individual object allocations. However, it relies on the page allocators support of memory policies through alloc_pages() to do the NUMA memory allocations on a per folio or page level. SLUB also applies memory policies when retrieving partial allocated slab pages from the partial list. Fixes:8014c46ad9("slub: use alloc_pages_node() in alloc_slab_page()") Signed-off-by: Christoph Lameter <cl@gentwo.org> Reviewed-by: Yang Shi <shy828301@gmail.com> Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
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.