The kmem_cache_alloc_bulk return value is weird. It returns the number
of allocated objects, but that must always be 0 or the requested number
based on the implementations and the handling in the callers, but that
assumption is not actually documented anywhere, which confuses automated
review tools.
Fix this by returning a bool if the allocation succeeded and adding a
kerneldoc comment explaining the API.
[[email protected]: fixups in
msm_iommu_pagetable_prealloc_allocate() ]
Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Alexander Lobakin <[email protected]> # skbuff
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Vlastimil Babka (SUSE) <[email protected]>
Use prefilled sheaves instead of bulk allocations. This should speed up
the allocations and the return path of unused allocations.
Remove the push and pop of nodes from the maple state as this is now
handled by the slab layer with sheaves.
Testing has been removed as necessary since the features of the tree
have been reduced.
Signed-off-by: Liam R. Howlett <[email protected]>
Reviewed-by: Suren Baghdasaryan <[email protected]>
Signed-off-by: Vlastimil Babka <[email protected]>
Add the prefilled sheaf structs to the slab header and the associated
functions to the testing/shared/linux.c file.
Signed-off-by: Liam R. Howlett <[email protected]>
Reviewed-by: Suren Baghdasaryan <[email protected]>
Signed-off-by: Vlastimil Babka <[email protected]>
The slab changes for sheaves requires more effort in the testing code.
Unite all the kmem_cache work into the tools/include slab header for
both the vma and maple tree testing.
The vma test code also requires importing more #defines to allow for
seamless use of the shared kmem_cache code.
This adds the pthread header to the slab header in the tools directory
to allow for the pthread_mutex in linux.c.
Signed-off-by: Liam R. Howlett <[email protected]>
Reviewed-by: Suren Baghdasaryan <[email protected]>
Signed-off-by: Vlastimil Babka <[email protected]>
Add new callback fields to the userspace implementation of struct
kmem_cache. This allows for executing callback functions in order to
further test low memory scenarios where node allocation is retried.
This callback can help test race conditions by calling a function when a
low memory event is tested.
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Sidhartha Kumar <[email protected]>
Reviewed-by: Liam R. Howlett <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Christoph Hellwig