Date: Wed, 20 May 2015 09:28:24 -0700 From: Adrian Chadd <adrian@freebsd.org> To: "freebsd-arch@freebsd.org" <freebsd-arch@freebsd.org>, "freebsd-embedded@freebsd.org" <freebsd-embedded@freebsd.org> Subject: RFC: make UMTX hash table size configurable Message-ID: <CAJ-VmonJ2LuU9kEk4h70JvF3C-uObS0FEY3G0Bemfuq3zYKdeQ@mail.gmail.com>
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Hi, This patch makes the umtx hash table size configurable. It saves ~40k of footprint from embedded images. (I can't seem to get phabricator to create a diff based on a set of files, rather than the whole tree. Sigh.) adrian@lucy-11i386:~/work/freebsd/head-embedded/src % svn diff sys/kern/ sys/conf/options Index: sys/kern/kern_umtx.c =================================================================== --- sys/kern/kern_umtx.c (revision 282934) +++ sys/kern/kern_umtx.c (working copy) @@ -29,7 +29,7 @@ __FBSDID("$FreeBSD$"); #include "opt_compat.h" -#include "opt_umtx_profiling.h" +#include "opt_umtx.h" #include <sys/param.h> #include <sys/kernel.h> @@ -184,7 +184,11 @@ PRI_MAX_TIMESHARE : (td)->td_user_pri) #define GOLDEN_RATIO_PRIME 2654404609U +#ifdef UMTX_NUM_CHAINS +#define UMTX_CHAINS UMTX_NUM_CHAINS +#else #define UMTX_CHAINS 512 +#endif /* UMTX_NUM_CHAINS */ #define UMTX_SHIFTS (__WORD_BIT - 9) #define GET_SHARE(flags) \ Index: sys/conf/options =================================================================== --- sys/conf/options (revision 282934) +++ sys/conf/options (working copy) @@ -209,7 +209,8 @@ SYSVSHM opt_sysvipc.h SW_WATCHDOG opt_watchdog.h TURNSTILE_PROFILING -UMTX_PROFILING +UMTX_PROFILING opt_umtx.h +UMTX_NUM_CHAINS opt_umtx.h VFS_AIO VERBOSE_SYSINIT WLCACHE opt_wavelan.h
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