Re: [RFC PATCH 0/2] use gnuhash to speed up device/driver match
On Sat, Mar 04, 2017 at 08:12:41AM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote: > Hi, > > The following patch series use the gnu hash to speedup device/driver > matching. > > String compare is slow so we will calculate at runtime a hash that we > can compare quickly to speed up the match > > in a second step we could speed up this more by calculating the hash > at compile time On a i.MX53 quickstart board this patch reduces startup time from 115.9ms to 115.4ms. On a i.MX35 board the startup time is reduced by 72us. I don't think this is a valuable gain. Do you have any situation where you really spend significant time in strcmp? Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0| Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917- | ___ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox
[RFC PATCH 0/2] use gnuhash to speed up device/driver match
Hi, The following patch series use the gnu hash to speedup device/driver matching. String compare is slow so we will calculate at runtime a hash that we can compare quickly to speed up the match in a second step we could speed up this more by calculating the hash at compile time The following changes since commit d92ed454107b4d6f0d30fa0271da191ae5911d18: Merge branch 'for-next/video' into next (2017-02-27 08:51:08 +0100) are available in the git repository at: git://git.jcrosoft.org/barebox.git delivery/gnuhash for you to fetch changes up to 5ede85afc958bdf488a3c5e56061e7f27c26cbc6: driver: generate hash at runtime to speed up device/driver matching (2017-03-01 03:49:34 +0800) Jean-Christophe PLAGNIOL-VILLARD (2): driver: remove the const of struct platform_device_id *id_table driver: generate hash at runtime to speed up device/driver matching drivers/base/bus.c| 16 ++-- drivers/base/driver.c | 27 ++- include/driver.h | 7 ++- 3 files changed, 42 insertions(+), 8 deletions(-) Best Regards, J. ___ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox
