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Date: Mon, 30 Jan 2017 17:47:31 +0100 From: Vlastimil Babka <vbabka@...e.cz> To: Michal Hocko <mhocko@...nel.org>, Andrew Morton <akpm@...ux-foundation.org> Cc: David Rientjes <rientjes@...gle.com>, Mel Gorman <mgorman@...e.de>, Johannes Weiner <hannes@...xchg.org>, Al Viro <viro@...iv.linux.org.uk>, linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>, Michal Hocko <mhocko@...e.com>, Kent Overstreet <kent.overstreet@...il.com> Subject: Re: [PATCH 8/9] bcache: use kvmalloc On 01/30/2017 10:49 AM, Michal Hocko wrote: > From: Michal Hocko <mhocko@...e.com> > > bcache_device_init uses kmalloc for small requests and vmalloc for those > which are larger than 64 pages. This alone is a strange criterion. > Moreover kmalloc can fallback to vmalloc on the failure. Let's simply > use kvmalloc instead as it knows how to handle the fallback properly I don't see why separate patch, some of the conversions in 5/9 were quite similar (except comparing with PAGE_SIZE, not 64*PAGE_SIZE), but nevermind. > Cc: Kent Overstreet <kent.overstreet@...il.com> > Signed-off-by: Michal Hocko <mhocko@...e.com> Acked-by: Vlastimil Babka <vbabka@...e.cz> > --- > drivers/md/bcache/super.c | 8 ++------ > 1 file changed, 2 insertions(+), 6 deletions(-) > > diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c > index 3a19cbc8b230..4cb6b88a1465 100644 > --- a/drivers/md/bcache/super.c > +++ b/drivers/md/bcache/super.c > @@ -767,16 +767,12 @@ static int bcache_device_init(struct bcache_device *d, unsigned block_size, > } > > n = d->nr_stripes * sizeof(atomic_t); > - d->stripe_sectors_dirty = n < PAGE_SIZE << 6 > - ? kzalloc(n, GFP_KERNEL) > - : vzalloc(n); > + d->stripe_sectors_dirty = kvzalloc(n, GFP_KERNEL); > if (!d->stripe_sectors_dirty) > return -ENOMEM; > > n = BITS_TO_LONGS(d->nr_stripes) * sizeof(unsigned long); > - d->full_dirty_stripes = n < PAGE_SIZE << 6 > - ? kzalloc(n, GFP_KERNEL) > - : vzalloc(n); > + d->full_dirty_stripes = kvzalloc(n, GFP_KERNEL); > if (!d->full_dirty_stripes) > return -ENOMEM; > >
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