From 9cef2e2b6589406562bf12a9a633d7d7630340a1 Mon Sep 17 00:00:00 2001 From: Joonsoo Kim Date: Mon, 2 Dec 2013 17:49:39 +0900 Subject: [PATCH] slab: factor out calculate nr objects in cache_estimate This logic is not simple to understand so that making separate function helping readability. Additionally, we can use this change in the following patch which implement for freelist to have another sized index in according to nr objects. Acked-by: Christoph Lameter Signed-off-by: Joonsoo Kim Signed-off-by: Pekka Enberg --- mm/slab.c | 48 +++++++++++++++++++++++++++--------------------- 1 file changed, 27 insertions(+), 21 deletions(-) diff --git a/mm/slab.c b/mm/slab.c index b264214c77ea..f81176dd0a90 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -565,9 +565,31 @@ static inline struct array_cache *cpu_cache_get(struct kmem_cache *cachep) return cachep->array[smp_processor_id()]; } -static size_t slab_mgmt_size(size_t nr_objs, size_t align) +static int calculate_nr_objs(size_t slab_size, size_t buffer_size, + size_t idx_size, size_t align) { - return ALIGN(nr_objs * sizeof(unsigned int), align); + int nr_objs; + size_t freelist_size; + + /* + * Ignore padding for the initial guess. The padding + * is at most @align-1 bytes, and @buffer_size is at + * least @align. In the worst case, this result will + * be one greater than the number of objects that fit + * into the memory allocation when taking the padding + * into account. + */ + nr_objs = slab_size / (buffer_size + idx_size); + + /* + * This calculated number will be either the right + * amount, or one greater than what we want. + */ + freelist_size = slab_size - nr_objs * buffer_size; + if (freelist_size < ALIGN(nr_objs * idx_size, align)) + nr_objs--; + + return nr_objs; } /* @@ -600,25 +622,9 @@ static void cache_estimate(unsigned long gfporder, size_t buffer_size, nr_objs = slab_size / buffer_size; } else { - /* - * Ignore padding for the initial guess. The padding - * is at most @align-1 bytes, and @buffer_size is at - * least @align. In the worst case, this result will - * be one greater than the number of objects that fit - * into the memory allocation when taking the padding - * into account. - */ - nr_objs = (slab_size) / (buffer_size + sizeof(unsigned int)); - - /* - * This calculated number will be either the right - * amount, or one greater than what we want. - */ - if (slab_mgmt_size(nr_objs, align) + nr_objs*buffer_size - > slab_size) - nr_objs--; - - mgmt_size = slab_mgmt_size(nr_objs, align); + nr_objs = calculate_nr_objs(slab_size, buffer_size, + sizeof(unsigned int), align); + mgmt_size = ALIGN(nr_objs * sizeof(unsigned int), align); } *num = nr_objs; *left_over = slab_size - nr_objs*buffer_size - mgmt_size; -- 2.20.1