Date: Thu, 27 Jan 2011 00:34:12 +0000 (UTC) From: Matthew D Fleming <mdf@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r217916 - in head: share/man/man9 sys/dev/cxgb sys/kern sys/vm Message-ID: <201101270034.p0R0YCMC095345@svn.freebsd.org>
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Author: mdf Date: Thu Jan 27 00:34:12 2011 New Revision: 217916 URL: http://svn.freebsd.org/changeset/base/217916 Log: Explicitly wire the user buffer rather than doing it implicitly in sbuf_new_for_sysctl(9). This allows using an sbuf with a SYSCTL_OUT drain for extremely large amounts of data where the caller knows that appropriate references are held, and sleeping is not an issue. Inspired by: rwatson Modified: head/share/man/man9/sbuf.9 head/sys/dev/cxgb/cxgb_sge.c head/sys/kern/kern_malloc.c head/sys/kern/kern_sysctl.c head/sys/kern/subr_lock.c head/sys/kern/subr_sleepqueue.c head/sys/kern/subr_witness.c head/sys/vm/uma_core.c head/sys/vm/vm_phys.c head/sys/vm/vm_reserv.c Modified: head/share/man/man9/sbuf.9 ============================================================================== --- head/share/man/man9/sbuf.9 Wed Jan 26 22:48:09 2011 (r217915) +++ head/share/man/man9/sbuf.9 Thu Jan 27 00:34:12 2011 (r217916) @@ -177,9 +177,9 @@ The function will set up an sbuf with a drain function to use .Fn SYSCTL_OUT when the internal buffer fills. -The sysctl old buffer will be wired, which allows for doing an -.Fn sbuf_printf -while holding a mutex. +Note that if the various functions which append to an sbuf are used while +a non-sleepable lock is held, the user buffer should be wired using +.Fn sysctl_wire_old_buffer . .Pp The .Fn sbuf_delete Modified: head/sys/dev/cxgb/cxgb_sge.c ============================================================================== --- head/sys/dev/cxgb/cxgb_sge.c Wed Jan 26 22:48:09 2011 (r217915) +++ head/sys/dev/cxgb/cxgb_sge.c Thu Jan 27 00:34:12 2011 (r217916) @@ -3251,7 +3251,9 @@ t3_dump_rspq(SYSCTL_HANDLER_ARGS) err = t3_sge_read_rspq(qs->port->adapter, rspq->cntxt_id, data); if (err) return (err); - + err = sysctl_wire_old_buffer(req, 0); + if (err) + return (err); sb = sbuf_new_for_sysctl(NULL, NULL, QDUMP_SBUF_SIZE, req); sbuf_printf(sb, " \n index=%u size=%u MSI-X/RspQ=%u intr enable=%u intr armed=%u\n", @@ -3316,7 +3318,9 @@ t3_dump_txq_eth(SYSCTL_HANDLER_ARGS) err = t3_sge_read_ecntxt(qs->port->adapter, qs->rspq.cntxt_id, data); if (err) return (err); - + err = sysctl_wire_old_buffer(req, 0); + if (err) + return (err); sb = sbuf_new_for_sysctl(NULL, NULL, QDUMP_SBUF_SIZE, req); sbuf_printf(sb, " \n credits=%u GTS=%u index=%u size=%u rspq#=%u cmdq#=%u\n", @@ -3381,6 +3385,9 @@ t3_dump_txq_ctrl(SYSCTL_HANDLER_ARGS) return (EINVAL); } + err = sysctl_wire_old_buffer(req, 0); + if (err != 0) + return (err); sb = sbuf_new_for_sysctl(NULL, NULL, QDUMP_SBUF_SIZE, req); sbuf_printf(sb, " qid=%d start=%d -> end=%d\n", qs->idx, txq->txq_dump_start, Modified: head/sys/kern/kern_malloc.c ============================================================================== --- head/sys/kern/kern_malloc.c Wed Jan 26 22:48:09 2011 (r217915) +++ head/sys/kern/kern_malloc.c Thu Jan 27 00:34:12 2011 (r217916) @@ -862,6 +862,9 @@ sysctl_kern_malloc_stats(SYSCTL_HANDLER_ int error, i; struct sbuf sbuf; + error = sysctl_wire_old_buffer(req, 0); + if (error != 0) + return (error); sbuf_new_for_sysctl(&sbuf, NULL, 128, req); mtx_lock(&malloc_mtx); @@ -1019,6 +1022,9 @@ sysctl_kern_mprof(SYSCTL_HANDLER_ARGS) waste = 0; mem = 0; + error = sysctl_wire_old_buffer(req, 0); + if (error != 0) + return (error); sbuf_new_for_sysctl(&sbuf, NULL, 128, req); sbuf_printf(&sbuf, "\n Size Requests Real Size\n"); Modified: head/sys/kern/kern_sysctl.c ============================================================================== --- head/sys/kern/kern_sysctl.c Wed Jan 26 22:48:09 2011 (r217915) +++ head/sys/kern/kern_sysctl.c Thu Jan 27 00:34:12 2011 (r217916) @@ -1591,7 +1591,8 @@ userland_sysctl(struct thread *td, int * } /* - * Drain into a sysctl struct. The user buffer must be wired. + * Drain into a sysctl struct. The user buffer should be wired if a page + * fault would cause issue. */ static int sbuf_sysctl_drain(void *arg, const char *data, int len) @@ -1609,9 +1610,6 @@ sbuf_new_for_sysctl(struct sbuf *s, char struct sysctl_req *req) { - /* Wire the user buffer, so we can write without blocking. */ - sysctl_wire_old_buffer(req, 0); - s = sbuf_new(s, buf, length, SBUF_FIXEDLEN); sbuf_set_drain(s, sbuf_sysctl_drain, req); return (s); Modified: head/sys/kern/subr_lock.c ============================================================================== --- head/sys/kern/subr_lock.c Wed Jan 26 22:48:09 2011 (r217915) +++ head/sys/kern/subr_lock.c Thu Jan 27 00:34:12 2011 (r217916) @@ -393,6 +393,9 @@ dump_lock_prof_stats(SYSCTL_HANDLER_ARGS int error, cpu, t; int enabled; + error = sysctl_wire_old_buffer(req, 0); + if (error != 0) + return (error); sb = sbuf_new_for_sysctl(NULL, NULL, LPROF_SBUF_SIZE, req); sbuf_printf(sb, "\n%8s %9s %11s %11s %11s %6s %6s %2s %6s %s\n", "max", "wait_max", "total", "wait_total", "count", "avg", "wait_avg", "cnt_hold", "cnt_lock", "name"); Modified: head/sys/kern/subr_sleepqueue.c ============================================================================== --- head/sys/kern/subr_sleepqueue.c Wed Jan 26 22:48:09 2011 (r217915) +++ head/sys/kern/subr_sleepqueue.c Thu Jan 27 00:34:12 2011 (r217916) @@ -1130,6 +1130,9 @@ dump_sleepq_prof_stats(SYSCTL_HANDLER_AR int error; int i; + error = sysctl_wire_old_buffer(req, 0); + if (error != 0) + return (error); sb = sbuf_new_for_sysctl(NULL, NULL, SLEEPQ_SBUFSIZE, req); sbuf_printf(sb, "\nwmesg\tcount\n"); enabled = prof_enabled; Modified: head/sys/kern/subr_witness.c ============================================================================== --- head/sys/kern/subr_witness.c Wed Jan 26 22:48:09 2011 (r217915) +++ head/sys/kern/subr_witness.c Thu Jan 27 00:34:12 2011 (r217916) @@ -2544,6 +2544,10 @@ sysctl_debug_witness_fullgraph(SYSCTL_HA return (error); } error = 0; + + error = sysctl_wire_old_buffer(req, 0); + if (error != 0) + return (error); sb = sbuf_new_for_sysctl(NULL, NULL, FULLGRAPH_SBUF_SIZE, req); if (sb == NULL) return (ENOMEM); Modified: head/sys/vm/uma_core.c ============================================================================== --- head/sys/vm/uma_core.c Wed Jan 26 22:48:09 2011 (r217915) +++ head/sys/vm/uma_core.c Thu Jan 27 00:34:12 2011 (r217916) @@ -3224,6 +3224,9 @@ sysctl_vm_zone_stats(SYSCTL_HANDLER_ARGS uma_keg_t k; int count, error, i; + error = sysctl_wire_old_buffer(req, 0); + if (error != 0) + return (error); sbuf_new_for_sysctl(&sbuf, NULL, 128, req); count = 0; Modified: head/sys/vm/vm_phys.c ============================================================================== --- head/sys/vm/vm_phys.c Wed Jan 26 22:48:09 2011 (r217915) +++ head/sys/vm/vm_phys.c Thu Jan 27 00:34:12 2011 (r217916) @@ -125,6 +125,9 @@ sysctl_vm_phys_free(SYSCTL_HANDLER_ARGS) struct vm_freelist *fl; int error, flind, oind, pind; + error = sysctl_wire_old_buffer(req, 0); + if (error != 0) + return (error); sbuf_new_for_sysctl(&sbuf, NULL, 128, req); for (flind = 0; flind < vm_nfreelists; flind++) { sbuf_printf(&sbuf, "\nFREE LIST %d:\n" @@ -161,6 +164,9 @@ sysctl_vm_phys_segs(SYSCTL_HANDLER_ARGS) struct vm_phys_seg *seg; int error, segind; + error = sysctl_wire_old_buffer(req, 0); + if (error != 0) + return (error); sbuf_new_for_sysctl(&sbuf, NULL, 128, req); for (segind = 0; segind < vm_phys_nsegs; segind++) { sbuf_printf(&sbuf, "\nSEGMENT %d:\n\n", segind); @@ -187,8 +193,11 @@ sysctl_vm_phys_lookup_lists(SYSCTL_HANDL struct sbuf sbuf; int domain, error, flind, ndomains; - ndomains = vm_nfreelists - VM_NFREELIST + 1; + error = sysctl_wire_old_buffer(req, 0); + if (error != 0) + return (error); sbuf_new_for_sysctl(&sbuf, NULL, 128, req); + ndomains = vm_nfreelists - VM_NFREELIST + 1; for (domain = 0; domain < ndomains; domain++) { sbuf_printf(&sbuf, "\nDOMAIN %d:\n\n", domain); for (flind = 0; flind < vm_nfreelists; flind++) Modified: head/sys/vm/vm_reserv.c ============================================================================== --- head/sys/vm/vm_reserv.c Wed Jan 26 22:48:09 2011 (r217915) +++ head/sys/vm/vm_reserv.c Thu Jan 27 00:34:12 2011 (r217916) @@ -182,6 +182,9 @@ sysctl_vm_reserv_partpopq(SYSCTL_HANDLER vm_reserv_t rv; int counter, error, level, unused_pages; + error = sysctl_wire_old_buffer(req, 0); + if (error != 0) + return (error); sbuf_new_for_sysctl(&sbuf, NULL, 128, req); sbuf_printf(&sbuf, "\nLEVEL SIZE NUMBER\n\n"); for (level = -1; level <= VM_NRESERVLEVEL - 2; level++) {
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