From owner-svn-src-all@freebsd.org Tue Nov 20 14:58:42 2018 Return-Path: Delivered-To: svn-src-all@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 2BBD51132177; Tue, 20 Nov 2018 14:58:42 +0000 (UTC) (envelope-from mjg@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id C6C8370A63; Tue, 20 Nov 2018 14:58:41 +0000 (UTC) (envelope-from mjg@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id A4C0912D69; Tue, 20 Nov 2018 14:58:41 +0000 (UTC) (envelope-from mjg@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id wAKEwfPZ033154; Tue, 20 Nov 2018 14:58:41 GMT (envelope-from mjg@FreeBSD.org) Received: (from mjg@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id wAKEwftP033152; Tue, 20 Nov 2018 14:58:41 GMT (envelope-from mjg@FreeBSD.org) Message-Id: <201811201458.wAKEwftP033152@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: mjg set sender to mjg@FreeBSD.org using -f From: Mateusz Guzik Date: Tue, 20 Nov 2018 14:58:41 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r340676 - in head/sys: kern sys X-SVN-Group: head X-SVN-Commit-Author: mjg X-SVN-Commit-Paths: in head/sys: kern sys X-SVN-Commit-Revision: 340676 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: C6C8370A63 X-Spamd-Result: default: False [0.54 / 15.00]; local_wl_from(0.00)[FreeBSD.org]; NEURAL_SPAM_SHORT(0.41)[0.414,0]; NEURAL_HAM_LONG(-0.00)[-0.003,0]; NEURAL_SPAM_MEDIUM(0.13)[0.126,0]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US] X-Rspamd-Server: mx1.freebsd.org X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Nov 2018 14:58:42 -0000 Author: mjg Date: Tue Nov 20 14:58:41 2018 New Revision: 340676 URL: https://svnweb.freebsd.org/changeset/base/340676 Log: Implement unr64 Important users of unr like tmpfs or pipes can get away with just ever-increasing counters, making the overhead of managing the state for 32 bit counters a pessimization. Change it to an atomic variable. This can be further sped up by making the counts variable "allocate" ranges and store them per-cpu. Reviewed by: kib Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D18054 Modified: head/sys/kern/subr_unit.c head/sys/sys/systm.h Modified: head/sys/kern/subr_unit.c ============================================================================== --- head/sys/kern/subr_unit.c Tue Nov 20 14:52:43 2018 (r340675) +++ head/sys/kern/subr_unit.c Tue Nov 20 14:58:41 2018 (r340676) @@ -98,6 +98,19 @@ static struct mtx unitmtx; MTX_SYSINIT(unit, &unitmtx, "unit# allocation", MTX_DEF); +#ifdef UNR64_LOCKED +uint64_t +alloc_unr64(struct unrhdr64 *unr64) +{ + uint64_t item; + + mtx_lock(&unitmtx); + item = unr64->counter++; + mtx_unlock(&unitmtx); + return (item); +} +#endif + #else /* ...USERLAND */ #include Modified: head/sys/sys/systm.h ============================================================================== --- head/sys/sys/systm.h Tue Nov 20 14:52:43 2018 (r340675) +++ head/sys/sys/systm.h Tue Nov 20 14:58:41 2018 (r340676) @@ -523,6 +523,32 @@ int alloc_unr_specific(struct unrhdr *uh, u_int item); int alloc_unrl(struct unrhdr *uh); void free_unr(struct unrhdr *uh, u_int item); +#if defined(__mips__) || defined(__powerpc__) +#define UNR64_LOCKED +#endif + +struct unrhdr64 { + uint64_t counter; +}; + +static __inline void +new_unrhdr64(struct unrhdr64 *unr64, uint64_t low) +{ + + unr64->counter = low; +} + +#ifdef UNR64_LOCKED +uint64_t alloc_unr64(struct unrhdr64 *); +#else +static __inline uint64_t +alloc_unr64(struct unrhdr64 *unr64) +{ + + return (atomic_fetchadd_64(&unr64->counter, 1)); +} +#endif + void intr_prof_stack_use(struct thread *td, struct trapframe *frame); void counted_warning(unsigned *counter, const char *msg);