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crush: merge working data and scratch 

Much like Arlo Guthrie, I decided that one big pile is better than two
little piles.

Reflects ceph.git commit 95c2df6c7e0b22d2ea9d91db500cf8b9441c73ba.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Ilya Dryomov 2017-01-31 15:55:06 +01:00
parent 66a0e2d579
commit 743efcffff
4 changed files with 29 additions and 19 deletions
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3
include/linux/ceph/osdmap.h
View File

@ -173,8 +173,7 @@ struct ceph_osdmap {
* the list of osds that store+replicate them. */
struct crush_map *crush;
struct mutex crush_scratch_mutex;
int crush_scratch_ary[CEPH_PG_MAX_SIZE * 3];
struct mutex crush_workspace_mutex;
void *crush_workspace;
};

14
include/linux/crush/mapper.h
View File

@ -15,7 +15,19 @@ extern int crush_do_rule(const struct crush_map *map,
int ruleno,
int x, int *result, int result_max,
const __u32 *weights, int weight_max,
void *cwin, int *scratch);
void *cwin);
/*
* Returns the exact amount of workspace that will need to be used
* for a given combination of crush_map and result_max. The caller can
* then allocate this much on its own, either on the stack, in a
* per-thread long-lived buffer, or however it likes.
*/
static inline size_t crush_work_size(const struct crush_map *map,
int result_max)
{
return map->working_size + result_max * 3 * sizeof(__u32);
}
void crush_init_workspace(const struct crush_map *map, void *v);

17
net/ceph/crush/mapper.c
View File

@ -855,23 +855,22 @@ void crush_init_workspace(const struct crush_map *map, void *v)
* @result_max: maximum result size
* @weight: weight vector (for map leaves)
* @weight_max: size of weight vector
* @cwin: pointer to at least map->working_size bytes of memory
* @scratch: scratch vector for private use; must be >= 3 * result_max
* @cwin: pointer to at least crush_work_size() bytes of memory
*/
int crush_do_rule(const struct crush_map *map,
int ruleno, int x, int *result, int result_max,
const __u32 *weight, int weight_max,
void *cwin, int *scratch)
void *cwin)
{
int result_len;
struct crush_work *cw = cwin;
int *a = scratch;
int *b = scratch + result_max;
int *c = scratch + result_max*2;
int *a = cwin + map->working_size;
int *b = a + result_max;
int *c = b + result_max;
int *w = a;
int *o = b;
int recurse_to_leaf;
int *w;
int wsize = 0;
int *o;
int osize;
int *tmp;
const struct crush_rule *rule;
@ -902,8 +901,6 @@ int crush_do_rule(const struct crush_map *map,
rule = map->rules[ruleno];
result_len = 0;
w = a;
o = b;
for (step = 0; step < rule->len; step++) {
int firstn = 0;

14
net/ceph/osdmap.c
View File

@ -743,7 +743,7 @@ struct ceph_osdmap *ceph_osdmap_alloc(void)
map->pool_max = -1;
map->pg_temp = RB_ROOT;
map->primary_temp = RB_ROOT;
mutex_init(&map->crush_scratch_mutex);
mutex_init(&map->crush_workspace_mutex);
return map;
}
@ -836,11 +836,14 @@ static int osdmap_set_max_osd(struct ceph_osdmap *map, int max)
static int osdmap_set_crush(struct ceph_osdmap *map, struct crush_map *crush)
{
void *workspace;
size_t work_size;
if (IS_ERR(crush))
return PTR_ERR(crush);
workspace = kmalloc(crush->working_size, GFP_NOIO);
work_size = crush_work_size(crush, CEPH_PG_MAX_SIZE);
dout("%s work_size %zu bytes\n", __func__, work_size);
workspace = kmalloc(work_size, GFP_NOIO);
if (!workspace) {
crush_destroy(crush);
return -ENOMEM;
@ -1974,11 +1977,10 @@ static int do_crush(struct ceph_osdmap *map, int ruleno, int x,
BUG_ON(result_max > CEPH_PG_MAX_SIZE);
mutex_lock(&map->crush_scratch_mutex);
mutex_lock(&map->crush_workspace_mutex);
r = crush_do_rule(map->crush, ruleno, x, result, result_max,
weight, weight_max, map->crush_workspace,
map->crush_scratch_ary);
mutex_unlock(&map->crush_scratch_mutex);
weight, weight_max, map->crush_workspace);
mutex_unlock(&map->crush_workspace_mutex);
return r;
}