Date: Mon, 28 Jul 2025 13:31:39 GMT From: Olivier Certner <olce@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: cc604213b597 - stable/14 - sched_4bsd: ESTCPULIM(): Allow any value in the timeshare range Message-ID: <202507281331.56SDVdpS082151@gitrepo.freebsd.org>
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The branch stable/14 has been updated by olce: URL: https://cgit.FreeBSD.org/src/commit/?id=cc604213b59777b33c413e2d2c70f63d4c3665bf commit cc604213b59777b33c413e2d2c70f63d4c3665bf Author: Olivier Certner <olce@FreeBSD.org> AuthorDate: 2024-05-21 12:55:43 +0000 Commit: Olivier Certner <olce@FreeBSD.org> CommitDate: 2025-07-28 13:28:42 +0000 sched_4bsd: ESTCPULIM(): Allow any value in the timeshare range The current formula wastes queues and degrades usage estimation precision, since any increase of ticks that goes over 40 priorities (so, 8 * 40) is clamped to the last of these 40 levels (the nice value is subsequently added to that number to get the final priority level). Allow 'ts_estcpu' to grow up to a value corresponding to the greatest (i.e., lowest) priority of the timeshare range. MFC after: 1 month Event: Kitchener-Waterloo Hackathon 202506 Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D45392 (cherry picked from commit eebc148f25c3012b943083b48fbfc13494e9c77f) --- sys/kern/sched_4bsd.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/sys/kern/sched_4bsd.c b/sys/kern/sched_4bsd.c index e9d180fde303..0e7ac9feb686 100644 --- a/sys/kern/sched_4bsd.c +++ b/sys/kern/sched_4bsd.c @@ -80,7 +80,9 @@ dtrace_vtime_switch_func_t dtrace_vtime_switch_func; #endif #define NICE_WEIGHT 1 /* Priorities per nice level. */ #define ESTCPULIM(e) \ - min((e), INVERSE_ESTCPU_WEIGHT * (NICE_WEIGHT * (PRIO_MAX - PRIO_MIN)) \ + min((e), INVERSE_ESTCPU_WEIGHT * \ + (NICE_WEIGHT * (PRIO_MAX - PRIO_MIN) + \ + PRI_MAX_TIMESHARE - PRI_MIN_TIMESHARE) \ + INVERSE_ESTCPU_WEIGHT - 1) #define TS_NAME_LEN (MAXCOMLEN + sizeof(" td ") + sizeof(__XSTRING(UINT_MAX)))
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