From 704f15ddb5fc2a7f25a12eb0913302d8ad9ffab3 Mon Sep 17 00:00:00 2001 From: Jesse Gross Date: Thu, 26 May 2011 16:25:02 -0700 Subject: [PATCH] flex_array: avoid divisions when accessing elements On most architectures division is an expensive operation and accessing an element currently requires four of them. This performance penalty effectively precludes flex arrays from being used on any kind of fast path. However, two of these divisions can be handled at creation time and the others can be replaced by a reciprocal divide, completely avoiding real divisions on access. [eparis@redhat.com: rebase on top of changes to support 0 len elements] [eparis@redhat.com: initialize part_nr when array fits entirely in base] Signed-off-by: Jesse Gross Signed-off-by: Eric Paris Cc: Dave Hansen Cc: David Rientjes Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/flex_array.h | 2 ++ lib/flex_array.c | 51 ++++++++++++++++++++++++++-------------------- 2 files changed, 31 insertions(+), 22 deletions(-) diff --git a/include/linux/flex_array.h b/include/linux/flex_array.h index ebeb2f3..6843cf1 100644 --- a/include/linux/flex_array.h +++ b/include/linux/flex_array.h @@ -21,6 +21,8 @@ struct flex_array { struct { int element_size; int total_nr_elements; + int elems_per_part; + u32 reciprocal_elems; struct flex_array_part *parts[]; }; /* diff --git a/lib/flex_array.c b/lib/flex_array.c index cab7621..9b8b894 100644 --- a/lib/flex_array.c +++ b/lib/flex_array.c @@ -24,6 +24,7 @@ #include #include #include +#include struct flex_array_part { char elements[FLEX_ARRAY_PART_SIZE]; @@ -70,15 +71,15 @@ static inline int elements_fit_in_base(struct flex_array *fa) * Element size | Objects | Objects | * PAGE_SIZE=4k | 32-bit | 64-bit | * ---------------------------------| - * 1 bytes | 4186112 | 2093056 | - * 2 bytes | 2093056 | 1046528 | - * 3 bytes | 1395030 | 697515 | - * 4 bytes | 1046528 | 523264 | - * 32 bytes | 130816 | 65408 | - * 33 bytes | 126728 | 63364 | - * 2048 bytes | 2044 | 1022 | - * 2049 bytes | 1022 | 511 | - * void * | 1046528 | 261632 | + * 1 bytes | 4177920 | 2088960 | + * 2 bytes | 2088960 | 1044480 | + * 3 bytes | 1392300 | 696150 | + * 4 bytes | 1044480 | 522240 | + * 32 bytes | 130560 | 65408 | + * 33 bytes | 126480 | 63240 | + * 2048 bytes | 2040 | 1020 | + * 2049 bytes | 1020 | 510 | + * void * | 1044480 | 261120 | * * Since 64-bit pointers are twice the size, we lose half the * capacity in the base structure. Also note that no effort is made @@ -88,11 +89,15 @@ struct flex_array *flex_array_alloc(int element_size, unsigned int total, gfp_t flags) { struct flex_array *ret; + int elems_per_part = 0; + int reciprocal_elems = 0; int max_size = 0; - if (element_size) - max_size = FLEX_ARRAY_NR_BASE_PTRS * - FLEX_ARRAY_ELEMENTS_PER_PART(element_size); + if (element_size) { + elems_per_part = FLEX_ARRAY_ELEMENTS_PER_PART(element_size); + reciprocal_elems = reciprocal_value(elems_per_part); + max_size = FLEX_ARRAY_NR_BASE_PTRS * elems_per_part; + } /* max_size will end up 0 if element_size > PAGE_SIZE */ if (total > max_size) @@ -102,6 +107,8 @@ struct flex_array *flex_array_alloc(int element_size, unsigned int total, return NULL; ret->element_size = element_size; ret->total_nr_elements = total; + ret->elems_per_part = elems_per_part; + ret->reciprocal_elems = reciprocal_elems; if (elements_fit_in_base(ret) && !(flags & __GFP_ZERO)) memset(&ret->parts[0], FLEX_ARRAY_FREE, FLEX_ARRAY_BASE_BYTES_LEFT); @@ -112,7 +119,7 @@ EXPORT_SYMBOL(flex_array_alloc); static int fa_element_to_part_nr(struct flex_array *fa, unsigned int element_nr) { - return element_nr / FLEX_ARRAY_ELEMENTS_PER_PART(fa->element_size); + return reciprocal_divide(element_nr, fa->reciprocal_elems); } /** @@ -141,12 +148,12 @@ void flex_array_free(struct flex_array *fa) EXPORT_SYMBOL(flex_array_free); static unsigned int index_inside_part(struct flex_array *fa, - unsigned int element_nr) + unsigned int element_nr, + unsigned int part_nr) { unsigned int part_offset; - part_offset = element_nr % - FLEX_ARRAY_ELEMENTS_PER_PART(fa->element_size); + part_offset = element_nr - part_nr * fa->elems_per_part; return part_offset * fa->element_size; } @@ -186,7 +193,7 @@ __fa_get_part(struct flex_array *fa, int part_nr, gfp_t flags) int flex_array_put(struct flex_array *fa, unsigned int element_nr, void *src, gfp_t flags) { - int part_nr; + int part_nr = 0; struct flex_array_part *part; void *dst; @@ -202,7 +209,7 @@ int flex_array_put(struct flex_array *fa, unsigned int element_nr, void *src, if (!part) return -ENOMEM; } - dst = &part->elements[index_inside_part(fa, element_nr)]; + dst = &part->elements[index_inside_part(fa, element_nr, part_nr)]; memcpy(dst, src, fa->element_size); return 0; } @@ -217,7 +224,7 @@ EXPORT_SYMBOL(flex_array_put); */ int flex_array_clear(struct flex_array *fa, unsigned int element_nr) { - int part_nr; + int part_nr = 0; struct flex_array_part *part; void *dst; @@ -233,7 +240,7 @@ int flex_array_clear(struct flex_array *fa, unsigned int element_nr) if (!part) return -EINVAL; } - dst = &part->elements[index_inside_part(fa, element_nr)]; + dst = &part->elements[index_inside_part(fa, element_nr, part_nr)]; memset(dst, FLEX_ARRAY_FREE, fa->element_size); return 0; } @@ -302,7 +309,7 @@ EXPORT_SYMBOL(flex_array_prealloc); */ void *flex_array_get(struct flex_array *fa, unsigned int element_nr) { - int part_nr; + int part_nr = 0; struct flex_array_part *part; if (!fa->element_size) @@ -317,7 +324,7 @@ void *flex_array_get(struct flex_array *fa, unsigned int element_nr) if (!part) return NULL; } - return &part->elements[index_inside_part(fa, element_nr)]; + return &part->elements[index_inside_part(fa, element_nr, part_nr)]; } EXPORT_SYMBOL(flex_array_get); -- 2.7.4