Messages in this thread | | | Date | Thu, 27 Apr 2023 16:51:59 -0600 | Subject | Re: [PATCH] nvmet: Reorder fields in 'struct nvmet_ns' | From | Jens Axboe <> |
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On 4/27/23 1:47 PM, Christophe JAILLET wrote: > Group some variables based on their sizes to reduce holes. > On x86_64, this shrinks the size of 'struct nvmet_ns' from 520 to 512 > bytes. > > When such a structure is allocated in nvmet_ns_alloc(), because of the way > memory allocation works, when 520 bytes were requested, 1024 bytes were > allocated. > > So, on x86_64, this change saves 512 bytes per allocation. > > Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> > --- > More aggressive grouping could be done to be more future proof, but the > way the struct nvmet_ns is written suggest that some fields should be > kept together. So keep grouping as-is.
I think you did the right thing, that move doesn't matter and it brings it to pow-of-2 or less and that is really what matters. So looks fine to me:
Reviewed-by: Jens Axboe <axboe@kernel.dk>
-- Jens Axboe
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