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lightnvm: pblk: add possibility to set write buffer size manually 

In some cases, users can want set write buffer size manually, e.g. to
adjust it to specific workload. This patch provides the possibility
to set write buffer size via module parameter feature.

Signed-off-by: Marcin Dziegielewski <marcin.dziegielewski@intel.com>
Signed-off-by: Igor Konopko <igor.j.konopko@intel.com>
Signed-off-by: Matias Bjørling <mb@lightnvm.io>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Marcin Dziegielewski 2018-06-01 16:41:10 +02:00 committed by Jens Axboe
parent fbadca7396
commit 4a828884c6
1 changed files with 12 additions and 2 deletions
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14
drivers/lightnvm/pblk-init.c
View File

@ -20,6 +20,11 @@
#include "pblk.h"
unsigned int write_buffer_size;
module_param(write_buffer_size, uint, 0644);
MODULE_PARM_DESC(write_buffer_size, "number of entries in a write buffer");
static struct kmem_cache *pblk_ws_cache, *pblk_rec_cache, *pblk_g_rq_cache,
*pblk_w_rq_cache;
static DECLARE_RWSEM(pblk_lock);
@ -172,10 +177,15 @@ static int pblk_rwb_init(struct pblk *pblk)
struct nvm_tgt_dev *dev = pblk->dev;
struct nvm_geo *geo = &dev->geo;
struct pblk_rb_entry *entries;
unsigned long nr_entries;
unsigned long nr_entries, buffer_size;
unsigned int power_size, power_seg_sz;
nr_entries = pblk_rb_calculate_size(pblk->pgs_in_buffer);
if (write_buffer_size && (write_buffer_size > pblk->pgs_in_buffer))
buffer_size = write_buffer_size;
else
buffer_size = pblk->pgs_in_buffer;
nr_entries = pblk_rb_calculate_size(buffer_size);
entries = vzalloc(nr_entries * sizeof(struct pblk_rb_entry));
if (!entries)