Author: mjg Date: Thu Jul 23 08:42:16 2020 New Revision: 363444 URL: https://svnweb.freebsd.org/changeset/base/363444
Log: vm: annotate swap_reserved with __exclusive_cache_line The counter keeps being updated all the time and variables read afterwards share the cacheline. Note this still fundamentally does not scale and needs to be replaced, in the meantime gets a bandaid. brk1_processes -t 52 ops/s: before: 8598298 after: 9098080 Modified: head/sys/vm/swap_pager.c Modified: head/sys/vm/swap_pager.c ============================================================================== --- head/sys/vm/swap_pager.c Thu Jul 23 03:25:31 2020 (r363443) +++ head/sys/vm/swap_pager.c Thu Jul 23 08:42:16 2020 (r363444) @@ -152,7 +152,7 @@ static int nswapdev; /* Number of swap devices */ int swap_pager_avail; static struct sx swdev_syscall_lock; /* serialize swap(on|off) */ -static u_long swap_reserved; +static __exclusive_cache_line u_long swap_reserved; static u_long swap_total; static int sysctl_page_shift(SYSCTL_HANDLER_ARGS); _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
