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Commit 4a828884 authored by Marcin Dziegielewski's avatar Marcin Dziegielewski Committed by Jens Axboe
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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: default avatarMarcin Dziegielewski <marcin.dziegielewski@intel.com>
Signed-off-by: default avatarIgor Konopko <igor.j.konopko@intel.com>
Signed-off-by: default avatarMatias Bjørling <mb@lightnvm.io>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent fbadca73

drivers/lightnvm/pblk-init.c

+12 −2
Original line number Diff line number Diff line
@@ -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)