> On 7 Jun 2018, at 18.15, Marcin Dziegielewski > <[email protected]> wrote: > > Some devices can expose mw_cunits equal to 0, it can cause the creation of > too small write buffer and cause performance to drop on write workloads. > > Additionally, write buffer size must cover openchannel write data > requirements, such as WS_MIN and MW_CUNITS - it must be greater than or equal > to the larger one multipled by number of luns. However, for the performance > reason, we are using WS_OPT value to calculation instead of WS_MIN. > > Because the place where buffer size is calculated was changed, this patch > also removes pgs_in_buffer filed in pblk structure.
Please keep 72 characters on the commit description. scripts/checkpatch.pl should report this. Maybe Matias can format it when picking it up. > > Signed-off-by: Marcin Dziegielewski <[email protected]> > Signed-off-by: Igor Konopko <[email protected]> > --- > drivers/lightnvm/pblk-init.c | 9 +++++---- > drivers/lightnvm/pblk.h | 3 --- > 2 files changed, 5 insertions(+), 7 deletions(-) > > diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c > index a27b28d..2f94832 100644 > --- a/drivers/lightnvm/pblk-init.c > +++ b/drivers/lightnvm/pblk-init.c > @@ -179,11 +179,14 @@ static int pblk_rwb_init(struct pblk *pblk) > struct pblk_rb_entry *entries; > unsigned long nr_entries, buffer_size; > unsigned int power_size, power_seg_sz; > + int pgs_in_buffer; > > - if (write_buffer_size && (write_buffer_size > pblk->pgs_in_buffer)) > + pgs_in_buffer = max(geo->mw_cunits, geo->ws_opt) * geo->all_luns; > + > + if (write_buffer_size && (write_buffer_size > pgs_in_buffer)) > buffer_size = write_buffer_size; > else > - buffer_size = pblk->pgs_in_buffer; > + buffer_size = pgs_in_buffer; > > nr_entries = pblk_rb_calculate_size(buffer_size); > > @@ -366,8 +369,6 @@ static int pblk_core_init(struct pblk *pblk) > atomic64_set(&pblk->nr_flush, 0); > pblk->nr_flush_rst = 0; > > - pblk->pgs_in_buffer = geo->mw_cunits * geo->all_luns; > - > pblk->min_write_pgs = geo->ws_opt * (geo->csecs / PAGE_SIZE); > max_write_ppas = pblk->min_write_pgs * geo->all_luns; > pblk->max_write_pgs = min_t(int, max_write_ppas, NVM_MAX_VLBA); > diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h > index 7fbdfdc..b62fc3e 100644 > --- a/drivers/lightnvm/pblk.h > +++ b/drivers/lightnvm/pblk.h > @@ -608,9 +608,6 @@ struct pblk { > > int min_write_pgs; /* Minimum amount of pages required by controller */ > int max_write_pgs; /* Maximum amount of pages supported by controller */ > - int pgs_in_buffer; /* Number of pages that need to be held in buffer to > - * guarantee successful reads. > - */ > > sector_t capacity; /* Device capacity when bad blocks are subtracted */ > > -- > 1.8.3.1 Otherwise the patch looks good. Reviewed-by: Javier González <[email protected]>
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