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author | Kent Overstreet <kent.overstreet@gmail.com> | 2019-03-11 23:31:26 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-03-12 10:04:03 -0700 |
commit | 586187d7de71b4da7956ba588ae42253b9ff6482 (patch) | |
tree | 58be71a6007246608c5d8c1b91efc9a432cc18c1 /Documentation/flexible-arrays.txt | |
parent | 2075e50caf5ea28be3cba0d01b3058bb5c3b0168 (diff) | |
download | linux-586187d7de71b4da7956ba588ae42253b9ff6482.tar.bz2 |
Drop flex_arrays
All existing users have been converted to generic radix trees
Link: http://lkml.kernel.org/r/20181217131929.11727-8-kent.overstreet@gmail.com
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Acked-by: Dave Hansen <dave.hansen@intel.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Eric Paris <eparis@parisplace.org>
Cc: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: Paul Moore <paul@paul-moore.com>
Cc: Pravin B Shelar <pshelar@ovn.org>
Cc: Shaohua Li <shli@kernel.org>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Cc: Vlad Yasevich <vyasevich@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/flexible-arrays.txt')
-rw-r--r-- | Documentation/flexible-arrays.txt | 123 |
1 files changed, 0 insertions, 123 deletions
diff --git a/Documentation/flexible-arrays.txt b/Documentation/flexible-arrays.txt deleted file mode 100644 index a0f2989dd804..000000000000 --- a/Documentation/flexible-arrays.txt +++ /dev/null @@ -1,123 +0,0 @@ -=================================== -Using flexible arrays in the kernel -=================================== - -:Updated: Last updated for 2.6.32 -:Author: Jonathan Corbet <corbet@lwn.net> - -Large contiguous memory allocations can be unreliable in the Linux kernel. -Kernel programmers will sometimes respond to this problem by allocating -pages with vmalloc(). This solution not ideal, though. On 32-bit systems, -memory from vmalloc() must be mapped into a relatively small address space; -it's easy to run out. On SMP systems, the page table changes required by -vmalloc() allocations can require expensive cross-processor interrupts on -all CPUs. And, on all systems, use of space in the vmalloc() range -increases pressure on the translation lookaside buffer (TLB), reducing the -performance of the system. - -In many cases, the need for memory from vmalloc() can be eliminated by -piecing together an array from smaller parts; the flexible array library -exists to make this task easier. - -A flexible array holds an arbitrary (within limits) number of fixed-sized -objects, accessed via an integer index. Sparse arrays are handled -reasonably well. Only single-page allocations are made, so memory -allocation failures should be relatively rare. The down sides are that the -arrays cannot be indexed directly, individual object size cannot exceed the -system page size, and putting data into a flexible array requires a copy -operation. It's also worth noting that flexible arrays do no internal -locking at all; if concurrent access to an array is possible, then the -caller must arrange for appropriate mutual exclusion. - -The creation of a flexible array is done with:: - - #include <linux/flex_array.h> - - struct flex_array *flex_array_alloc(int element_size, - unsigned int total, - gfp_t flags); - -The individual object size is provided by element_size, while total is the -maximum number of objects which can be stored in the array. The flags -argument is passed directly to the internal memory allocation calls. With -the current code, using flags to ask for high memory is likely to lead to -notably unpleasant side effects. - -It is also possible to define flexible arrays at compile time with:: - - DEFINE_FLEX_ARRAY(name, element_size, total); - -This macro will result in a definition of an array with the given name; the -element size and total will be checked for validity at compile time. - -Storing data into a flexible array is accomplished with a call to:: - - int flex_array_put(struct flex_array *array, unsigned int element_nr, - void *src, gfp_t flags); - -This call will copy the data from src into the array, in the position -indicated by element_nr (which must be less than the maximum specified when -the array was created). If any memory allocations must be performed, flags -will be used. The return value is zero on success, a negative error code -otherwise. - -There might possibly be a need to store data into a flexible array while -running in some sort of atomic context; in this situation, sleeping in the -memory allocator would be a bad thing. That can be avoided by using -GFP_ATOMIC for the flags value, but, often, there is a better way. The -trick is to ensure that any needed memory allocations are done before -entering atomic context, using:: - - int flex_array_prealloc(struct flex_array *array, unsigned int start, - unsigned int nr_elements, gfp_t flags); - -This function will ensure that memory for the elements indexed in the range -defined by start and nr_elements has been allocated. Thereafter, a -flex_array_put() call on an element in that range is guaranteed not to -block. - -Getting data back out of the array is done with:: - - void *flex_array_get(struct flex_array *fa, unsigned int element_nr); - -The return value is a pointer to the data element, or NULL if that -particular element has never been allocated. - -Note that it is possible to get back a valid pointer for an element which -has never been stored in the array. Memory for array elements is allocated -one page at a time; a single allocation could provide memory for several -adjacent elements. Flexible array elements are normally initialized to the -value FLEX_ARRAY_FREE (defined as 0x6c in <linux/poison.h>), so errors -involving that number probably result from use of unstored array entries. -Note that, if array elements are allocated with __GFP_ZERO, they will be -initialized to zero and this poisoning will not happen. - -Individual elements in the array can be cleared with:: - - int flex_array_clear(struct flex_array *array, unsigned int element_nr); - -This function will set the given element to FLEX_ARRAY_FREE and return -zero. If storage for the indicated element is not allocated for the array, -flex_array_clear() will return -EINVAL instead. Note that clearing an -element does not release the storage associated with it; to reduce the -allocated size of an array, call:: - - int flex_array_shrink(struct flex_array *array); - -The return value will be the number of pages of memory actually freed. -This function works by scanning the array for pages containing nothing but -FLEX_ARRAY_FREE bytes, so (1) it can be expensive, and (2) it will not work -if the array's pages are allocated with __GFP_ZERO. - -It is possible to remove all elements of an array with a call to:: - - void flex_array_free_parts(struct flex_array *array); - -This call frees all elements, but leaves the array itself in place. -Freeing the entire array is done with:: - - void flex_array_free(struct flex_array *array); - -As of this writing, there are no users of flexible arrays in the mainline -kernel. The functions described here are also not exported to modules; -that will probably be fixed when somebody comes up with a need for it. |