Implement "FAST" mode for GEOM_STRIPE class and turn it on by default.
In this mode you can setup even very small stripe size and you can be sure that only one I/O request will be send to every disks in stripe. It consumes some more memory, but if allocation fails, it will fall back to "ECONOMIC" mode. It is about 10 times faster for small stripe size than "ECONOMIC" mode and other RAID0 implementations. It is even recommended to use this mode and small stripe size, so our requests are always splitted. One can still use "ECONOMIC" mode by setting kern.geom.stripe.fast to 0. It is also possible to setup maximum memory which "FAST" mode can consume, by setting kern.geom.stripe.maxmem from /boot/loader.conf.
This commit is contained in:
parent
539bec4042
commit
4c55f05b89
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=131878
@ -36,17 +36,15 @@ __FBSDID("$FreeBSD$");
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#include <sys/bio.h>
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#include <sys/sysctl.h>
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#include <sys/malloc.h>
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#include <vm/uma.h>
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#include <geom/geom.h>
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#include <geom/stripe/g_stripe.h>
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#define MAX_IO_SIZE (DFLTPHYS * 2)
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static MALLOC_DEFINE(M_STRIPE, "stripe data", "GEOM_STRIPE Data");
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SYSCTL_DECL(_kern_geom);
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SYSCTL_NODE(_kern_geom, OID_AUTO, stripe, CTLFLAG_RW, 0, "GEOM_STRIPE stuff");
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static u_int g_stripe_debug = 0;
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SYSCTL_UINT(_kern_geom_stripe, OID_AUTO, debug, CTLFLAG_RW, &g_stripe_debug, 0,
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"Debug level");
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static uma_zone_t g_stripe_zone;
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static int g_stripe_destroy(struct g_stripe_softc *sc, boolean_t force);
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static int g_stripe_destroy_geom(struct gctl_req *req, struct g_class *mp,
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@ -55,14 +53,42 @@ static int g_stripe_destroy_geom(struct gctl_req *req, struct g_class *mp,
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static g_taste_t g_stripe_taste;
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static g_ctl_req_t g_stripe_config;
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static g_dumpconf_t g_stripe_dumpconf;
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static g_init_t g_stripe_init;
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static g_fini_t g_stripe_fini;
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struct g_class g_stripe_class = {
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.name = G_STRIPE_CLASS_NAME,
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.ctlreq = g_stripe_config,
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.taste = g_stripe_taste,
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.destroy_geom = g_stripe_destroy_geom
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.destroy_geom = g_stripe_destroy_geom,
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.init = g_stripe_init,
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.fini = g_stripe_fini
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};
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SYSCTL_DECL(_kern_geom);
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SYSCTL_NODE(_kern_geom, OID_AUTO, stripe, CTLFLAG_RW, 0, "GEOM_STRIPE stuff");
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static u_int g_stripe_debug = 0;
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SYSCTL_UINT(_kern_geom_stripe, OID_AUTO, debug, CTLFLAG_RW, &g_stripe_debug, 0,
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"Debug level");
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static int g_stripe_fast = 1;
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TUNABLE_INT("kern.geom.stripe.fast", &g_stripe_fast);
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static int
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g_sysctl_stripe_fast(SYSCTL_HANDLER_ARGS)
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{
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int error, fast;
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fast = g_stripe_fast;
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error = sysctl_handle_int(oidp, &fast, sizeof(fast), req);
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if (error == 0 && req->newptr != NULL)
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g_stripe_fast = fast;
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return (error);
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}
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SYSCTL_PROC(_kern_geom_stripe, OID_AUTO, fast, CTLTYPE_INT | CTLFLAG_RW,
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NULL, 0, g_sysctl_stripe_fast, "I", "Fast, but memory-consuming mode");
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static u_int g_stripe_maxmem = MAX_IO_SIZE * 10;
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TUNABLE_INT("kern.geom.stripe.maxmem", &g_stripe_maxmem);
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SYSCTL_UINT(_kern_geom_stripe, OID_AUTO, maxmem, CTLFLAG_RD, &g_stripe_maxmem,
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0, "Maximum memory that could be allocated in \"fast\" mode (in bytes)");
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/*
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* Greatest Common Divisor.
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@ -90,6 +116,23 @@ lcm(u_int a, u_int b)
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return ((a * b) / gcd(a, b));
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}
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static void
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g_stripe_init(struct g_class *mp __unused)
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{
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g_stripe_zone = uma_zcreate("g_stripe_zone", MAX_IO_SIZE, NULL, NULL,
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NULL, NULL, 0, 0);
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g_stripe_maxmem -= g_stripe_maxmem % MAX_IO_SIZE;
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uma_zone_set_max(g_stripe_zone, g_stripe_maxmem / MAX_IO_SIZE);
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}
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static void
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g_stripe_fini(struct g_class *mp __unused)
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{
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uma_zdestroy(g_stripe_zone);
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}
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/*
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* Return the number of valid disks.
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*/
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@ -204,20 +247,279 @@ g_stripe_access(struct g_provider *pp, int dr, int dw, int de)
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return (error);
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}
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static void
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g_stripe_copy(struct g_stripe_softc *sc, char *src, char *dst, off_t offset,
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off_t length, int mode)
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{
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u_int stripesize;
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size_t len;
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stripesize = sc->sc_stripesize;
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len = (size_t)(stripesize - (offset & (stripesize - 1)));
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do {
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bcopy(src, dst, len);
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if (mode) {
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dst += len + stripesize * (sc->sc_ndisks - 1);
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src += len;
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} else {
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dst += len;
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src += len + stripesize * (sc->sc_ndisks - 1);
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}
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length -= len;
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KASSERT(length >= 0,
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("Length < 0 (stripesize=%zu, offset=%jd, length=%jd).",
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(size_t)stripesize, (intmax_t)offset, (intmax_t)length));
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if (length > stripesize)
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len = stripesize;
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else
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len = length;
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} while (length > 0);
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}
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static void
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g_stripe_done(struct bio *bp)
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{
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struct g_stripe_softc *sc;
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struct bio *pbp;
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pbp = bp->bio_parent;
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sc = pbp->bio_to->geom->softc;
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if (pbp->bio_error == 0)
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pbp->bio_error = bp->bio_error;
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pbp->bio_completed += bp->bio_completed;
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if (bp->bio_cmd == BIO_READ && bp->bio_driver1 != NULL) {
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g_stripe_copy(sc, bp->bio_data, bp->bio_driver1, bp->bio_offset,
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bp->bio_length, 1);
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bp->bio_data = bp->bio_driver1;
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bp->bio_driver1 = NULL;
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}
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g_destroy_bio(bp);
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pbp->bio_inbed++;
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if (pbp->bio_children == pbp->bio_inbed) {
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if (pbp->bio_caller1 != NULL)
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uma_zfree(g_stripe_zone, pbp->bio_caller1);
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g_io_deliver(pbp, pbp->bio_error);
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}
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}
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static int
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g_stripe_start_fast(struct bio *bp, u_int no, off_t offset, off_t length)
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{
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TAILQ_HEAD(, bio) queue = TAILQ_HEAD_INITIALIZER(queue);
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u_int nparts = 0, stripesize;
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struct g_stripe_softc *sc;
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char *addr, *data = NULL;
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struct bio *cbp;
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int error;
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sc = bp->bio_to->geom->softc;
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addr = bp->bio_data;
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stripesize = sc->sc_stripesize;
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cbp = g_clone_bio(bp);
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if (cbp == NULL) {
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error = ENOMEM;
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goto failure;
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}
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TAILQ_INSERT_TAIL(&queue, cbp, bio_queue);
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nparts++;
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/*
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* Fill in the component buf structure.
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*/
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cbp->bio_done = g_stripe_done;
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cbp->bio_offset = offset;
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cbp->bio_data = addr;
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cbp->bio_driver1 = NULL;
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cbp->bio_length = length;
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cbp->bio_driver2 = sc->sc_disks[no];
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/* offset -= offset % stripesize; */
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offset -= offset & (stripesize - 1);
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addr += length;
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length = bp->bio_length - length;
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for (no++; length > 0; no++, length -= stripesize, addr += stripesize) {
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if (no > sc->sc_ndisks - 1) {
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no = 0;
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offset += stripesize;
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}
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if (nparts >= sc->sc_ndisks) {
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cbp = TAILQ_NEXT(cbp, bio_queue);
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if (cbp == NULL)
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cbp = TAILQ_FIRST(&queue);
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nparts++;
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/*
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* Update bio structure.
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*/
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/*
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* MIN() is in case when
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* (bp->bio_length % sc->sc_stripesize) != 0.
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*/
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cbp->bio_length += MIN(stripesize, length);
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if (cbp->bio_driver1 == NULL) {
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cbp->bio_driver1 = cbp->bio_data;
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cbp->bio_data = NULL;
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if (data == NULL) {
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data = uma_zalloc(g_stripe_zone,
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M_NOWAIT);
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if (data == NULL) {
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error = ENOMEM;
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goto failure;
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}
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}
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}
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} else {
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cbp = g_clone_bio(bp);
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if (cbp == NULL) {
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error = ENOMEM;
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goto failure;
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}
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TAILQ_INSERT_TAIL(&queue, cbp, bio_queue);
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nparts++;
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/*
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* Fill in the component buf structure.
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*/
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cbp->bio_done = g_stripe_done;
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cbp->bio_offset = offset;
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cbp->bio_data = addr;
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cbp->bio_driver1 = NULL;
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/*
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* MIN() is in case when
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* (bp->bio_length % sc->sc_stripesize) != 0.
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*/
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cbp->bio_length = MIN(stripesize, length);
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cbp->bio_driver2 = sc->sc_disks[no];
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}
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}
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if (data != NULL)
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bp->bio_caller1 = data;
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/*
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* Fire off all allocated requests!
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*/
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while ((cbp = TAILQ_FIRST(&queue)) != NULL) {
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struct g_consumer *cp;
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TAILQ_REMOVE(&queue, cbp, bio_queue);
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cp = cbp->bio_driver2;
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cbp->bio_driver2 = NULL;
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cbp->bio_to = cp->provider;
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if (cbp->bio_driver1 != NULL) {
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cbp->bio_data = data;
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if (bp->bio_cmd == BIO_WRITE) {
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g_stripe_copy(sc, cbp->bio_driver1, data,
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cbp->bio_offset, cbp->bio_length, 0);
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}
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data += cbp->bio_length;
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}
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G_STRIPE_LOGREQ(cbp, "Sending request.");
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g_io_request(cbp, cp);
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}
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return (0);
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failure:
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if (data != NULL)
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uma_zfree(g_stripe_zone, data);
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while ((cbp = TAILQ_FIRST(&queue)) != NULL) {
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TAILQ_REMOVE(&queue, cbp, bio_queue);
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if (cbp->bio_driver1 != NULL) {
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cbp->bio_data = cbp->bio_driver1;
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cbp->bio_driver1 = NULL;
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}
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g_destroy_bio(cbp);
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}
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return (error);
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}
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static int
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g_stripe_start_economic(struct bio *bp, u_int no, off_t offset, off_t length)
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{
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TAILQ_HEAD(, bio) queue = TAILQ_HEAD_INITIALIZER(queue);
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struct g_stripe_softc *sc;
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uint32_t stripesize;
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struct bio *cbp;
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char *addr;
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int error;
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sc = bp->bio_to->geom->softc;
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addr = bp->bio_data;
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stripesize = sc->sc_stripesize;
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cbp = g_clone_bio(bp);
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if (cbp == NULL) {
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error = ENOMEM;
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goto failure;
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}
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TAILQ_INSERT_TAIL(&queue, cbp, bio_queue);
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/*
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* Fill in the component buf structure.
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*/
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cbp->bio_done = g_std_done;
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cbp->bio_offset = offset;
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cbp->bio_data = addr;
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cbp->bio_length = length;
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cbp->bio_driver2 = sc->sc_disks[no];
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/* offset -= offset % stripesize; */
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offset -= offset & (stripesize - 1);
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addr += length;
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length = bp->bio_length - length;
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for (no++; length > 0; no++, length -= stripesize, addr += stripesize) {
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if (no > sc->sc_ndisks - 1) {
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no = 0;
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offset += stripesize;
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}
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cbp = g_clone_bio(bp);
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if (cbp == NULL) {
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error = ENOMEM;
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goto failure;
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}
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TAILQ_INSERT_TAIL(&queue, cbp, bio_queue);
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/*
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* Fill in the component buf structure.
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*/
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cbp->bio_done = g_std_done;
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cbp->bio_offset = offset;
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cbp->bio_data = addr;
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/*
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* MIN() is in case when
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* (bp->bio_length % sc->sc_stripesize) != 0.
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*/
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cbp->bio_length = MIN(stripesize, length);
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cbp->bio_driver2 = sc->sc_disks[no];
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}
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/*
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* Fire off all allocated requests!
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*/
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while ((cbp = TAILQ_FIRST(&queue)) != NULL) {
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struct g_consumer *cp;
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TAILQ_REMOVE(&queue, cbp, bio_queue);
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cp = cbp->bio_driver2;
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cbp->bio_driver2 = NULL;
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cbp->bio_to = cp->provider;
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G_STRIPE_LOGREQ(cbp, "Sending request.");
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g_io_request(cbp, cp);
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}
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return (0);
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failure:
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while ((cbp = TAILQ_FIRST(&queue)) != NULL) {
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TAILQ_REMOVE(&queue, cbp, bio_queue);
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g_destroy_bio(cbp);
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}
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return (error);
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}
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static void
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g_stripe_start(struct bio *bp)
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{
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struct g_provider *pp;
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off_t offset, start, length, nstripe;
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struct g_stripe_softc *sc;
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off_t off, start, length, nstripe;
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struct bio *cbp;
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u_int sectorsize;
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uint32_t stripesize;
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uint16_t no;
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char *addr;
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u_int no, stripesize;
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int error, fast = 0;
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pp = bp->bio_to;
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sc = pp->geom->softc;
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sc = bp->bio_to->geom->softc;
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/*
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* If sc == NULL, provider's error should be set and g_stripe_start()
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* should not be called at all.
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@ -243,12 +545,10 @@ g_stripe_start(struct bio *bp)
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return;
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}
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addr = bp->bio_data;
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sectorsize = sc->sc_provider->sectorsize;
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stripesize = sc->sc_stripesize;
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/*
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* Calcucations are quite messy, but fast I hope.
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* Calculations are quite messy, but fast I hope.
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*/
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/* Stripe number. */
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@ -260,76 +560,41 @@ g_stripe_start(struct bio *bp)
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/* start = bp->bio_offset % stripesize; */
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start = bp->bio_offset & (stripesize - 1);
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/* Start position in disk. */
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/* off = (nstripe / sc->sc_ndisks) * stripesize + start; */
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off = ((nstripe / sc->sc_ndisks) << sc->sc_stripebits) + start;
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/* offset = (nstripe / sc->sc_ndisks) * stripesize + start; */
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offset = ((nstripe / sc->sc_ndisks) << sc->sc_stripebits) + start;
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/* Length of data to operate. */
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length = MIN(bp->bio_length, stripesize - start);
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cbp = g_clone_bio(bp);
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if (cbp == NULL) {
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/*
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* Deny all request. This is pointless
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* to split rest of the request, bacause
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* we're setting bio_error here, so all
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* request will be denied, anyway.
|
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*/
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bp->bio_completed = bp->bio_length;
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if (bp->bio_error == 0)
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bp->bio_error = ENOMEM;
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g_io_deliver(bp, bp->bio_error);
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return;
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}
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/*
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* Fill in the component buf structure.
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* Do use "fast" mode when:
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* 1. "Fast" mode is ON.
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* and
|
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* 2. Request size is less than or equal to MAX_IO_SIZE (128kB),
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* which should always be true.
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* and
|
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* 3. Request size is bigger than stripesize * ndisks. If it isn't,
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* there will be no need to send more than one I/O request to
|
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* a provider, so there is nothing to optmize.
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*/
|
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cbp->bio_done = g_std_done;
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cbp->bio_offset = off;
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cbp->bio_data = addr;
|
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cbp->bio_length = length;
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cbp->bio_to = sc->sc_disks[no]->provider;
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G_STRIPE_LOGREQ(cbp, "Sending request.");
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g_io_request(cbp, sc->sc_disks[no]);
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/* off -= off % stripesize; */
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off -= off & (stripesize - 1);
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addr += length;
|
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length = bp->bio_length - length;
|
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for (no++; length > 0; no++, length -= stripesize, addr += stripesize) {
|
||||
if (no > sc->sc_ndisks - 1) {
|
||||
no = 0;
|
||||
off += stripesize;
|
||||
}
|
||||
cbp = g_clone_bio(bp);
|
||||
if (cbp == NULL) {
|
||||
/*
|
||||
* Deny remaining part. This is pointless
|
||||
* to split rest of the request, bacause
|
||||
* we're setting bio_error here, so all
|
||||
* request will be denied, anyway.
|
||||
*/
|
||||
bp->bio_completed += length;
|
||||
if (bp->bio_error == 0)
|
||||
bp->bio_error = ENOMEM;
|
||||
if (bp->bio_completed == bp->bio_length)
|
||||
g_io_deliver(bp, bp->bio_error);
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* Fill in the component buf structure.
|
||||
*/
|
||||
cbp->bio_done = g_std_done;
|
||||
cbp->bio_offset = off;
|
||||
cbp->bio_data = addr;
|
||||
/*
|
||||
* MIN() is in case when
|
||||
* (bp->bio_length % sc->sc_stripesize) != 0.
|
||||
*/
|
||||
cbp->bio_length = MIN(stripesize, length);
|
||||
|
||||
cbp->bio_to = sc->sc_disks[no]->provider;
|
||||
G_STRIPE_LOGREQ(cbp, "Sending request.");
|
||||
g_io_request(cbp, sc->sc_disks[no]);
|
||||
if (g_stripe_fast && bp->bio_length <= MAX_IO_SIZE &&
|
||||
bp->bio_length >= stripesize * sc->sc_ndisks) {
|
||||
fast = 1;
|
||||
}
|
||||
error = 0;
|
||||
if (fast)
|
||||
error = g_stripe_start_fast(bp, no, offset, length);
|
||||
/*
|
||||
* Do use "economic" when:
|
||||
* 1. "Economic" mode is ON.
|
||||
* or
|
||||
* 2. "Fast" mode failed. It can only failed if there is no memory.
|
||||
*/
|
||||
if (!fast || error != 0)
|
||||
error = g_stripe_start_economic(bp, no, offset, length);
|
||||
if (error != 0) {
|
||||
if (bp->bio_error == 0)
|
||||
bp->bio_error = error;
|
||||
g_io_deliver(bp, bp->bio_error);
|
||||
}
|
||||
}
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user