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Fri, 14 Feb 2020 15:23:18 +0000 (UTC) Date: Fri, 14 Feb 2020 15:23:15 +0000 From: "Dr. David Alan Gilbert" To: Juan Quintela Subject: Re: [PATCH v6 5/8] multifd: Add zlib compression multifd support Message-ID: <20200214152315.GJ3283@work-vm> References: <20200213211709.59065-1-quintela@redhat.com> <20200213211709.59065-6-quintela@redhat.com> MIME-Version: 1.0 In-Reply-To: <20200213211709.59065-6-quintela@redhat.com> User-Agent: Mutt/1.13.3 (2020-01-12) X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-MC-Unique: Ei_vScfaOxKukvVCO7_RBw-1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Content-Disposition: inline X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 205.139.110.120 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Fam Zheng , Laurent Vivier , Thomas Huth , Daniel =?iso-8859-1?Q?P=2E_Berrang=E9?= , Eduardo Habkost , Philippe =?iso-8859-1?Q?Mathieu-Daud=E9?= , qemu-devel@nongnu.org, Markus Armbruster , Paolo Bonzini , Alex =?iso-8859-1?Q?Benn=E9e?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" * Juan Quintela (quintela@redhat.com) wrote: > Signed-off-by: Juan Quintela > Acked-by: Markus Armbruster Reviewed-by: Dr. David Alan Gilbert > --- > hw/core/qdev-properties.c | 2 +- > migration/Makefile.objs | 1 + > migration/multifd-zlib.c | 325 +++++++++++++++++++++++++++++++++++ > migration/multifd.c | 6 + > migration/multifd.h | 4 + > qapi/migration.json | 3 +- > tests/qtest/migration-test.c | 6 + > 7 files changed, 345 insertions(+), 2 deletions(-) > create mode 100644 migration/multifd-zlib.c >=20 > diff --git a/hw/core/qdev-properties.c b/hw/core/qdev-properties.c > index fa7edac020..db2a7abfb2 100644 > --- a/hw/core/qdev-properties.c > +++ b/hw/core/qdev-properties.c > @@ -645,7 +645,7 @@ const PropertyInfo qdev_prop_fdc_drive_type =3D { > const PropertyInfo qdev_prop_multifd_compression =3D { > .name =3D "MultiFDCompression", > .description =3D "multifd_compression values, " > - "none", > + "none/zlib", > .enum_table =3D &MultiFDCompression_lookup, > .get =3D get_enum, > .set =3D set_enum, > diff --git a/migration/Makefile.objs b/migration/Makefile.objs > index d3623d5f9b..0308caa5c5 100644 > --- a/migration/Makefile.objs > +++ b/migration/Makefile.objs > @@ -8,6 +8,7 @@ common-obj-y +=3D xbzrle.o postcopy-ram.o > common-obj-y +=3D qjson.o > common-obj-y +=3D block-dirty-bitmap.o > common-obj-y +=3D multifd.o > +common-obj-y +=3D multifd-zlib.o > =20 > common-obj-$(CONFIG_RDMA) +=3D rdma.o > =20 > diff --git a/migration/multifd-zlib.c b/migration/multifd-zlib.c > new file mode 100644 > index 0000000000..ab4ba75d75 > --- /dev/null > +++ b/migration/multifd-zlib.c > @@ -0,0 +1,325 @@ > +/* > + * Multifd zlib compression implementation > + * > + * Copyright (c) 2020 Red Hat Inc > + * > + * Authors: > + * Juan Quintela > + * > + * This work is licensed under the terms of the GNU GPL, version 2 or la= ter. > + * See the COPYING file in the top-level directory. > + */ > + > +#include "qemu/osdep.h" > +#include > +#include "qemu/rcu.h" > +#include "exec/target_page.h" > +#include "qapi/error.h" > +#include "migration.h" > +#include "trace.h" > +#include "multifd.h" > + > +struct zlib_data { > + /* stream for compression */ > + z_stream zs; > + /* compressed buffer */ > + uint8_t *zbuff; > + /* size of compressed buffer */ > + uint32_t zbuff_len; > +}; > + > +/* Multifd zlib compression */ > + > +/** > + * zlib_send_setup: setup send side > + * > + * Setup each channel with zlib compression. > + * > + * Returns 0 for success or -1 for error > + * > + * @p: Params for the channel that we are using > + * @errp: pointer to an error > + */ > +static int zlib_send_setup(MultiFDSendParams *p, Error **errp) > +{ > + uint32_t page_count =3D MULTIFD_PACKET_SIZE / qemu_target_page_size(= ); > + struct zlib_data *z =3D g_malloc0(sizeof(struct zlib_data)); > + z_stream *zs =3D &z->zs; > + > + zs->zalloc =3D Z_NULL; > + zs->zfree =3D Z_NULL; > + zs->opaque =3D Z_NULL; > + if (deflateInit(zs, migrate_multifd_zlib_level()) !=3D Z_OK) { > + g_free(z); > + error_setg(errp, "multifd %d: deflate init failed", p->id); > + return -1; > + } > + /* We will never have more than page_count pages */ > + z->zbuff_len =3D page_count * qemu_target_page_size(); > + z->zbuff_len *=3D 2; > + z->zbuff =3D g_try_malloc(z->zbuff_len); > + if (!z->zbuff) { > + deflateEnd(&z->zs); > + g_free(z); > + error_setg(errp, "multifd %d: out of memory for zbuff", p->id); > + return -1; > + } > + p->data =3D z; > + return 0; > +} > + > +/** > + * zlib_send_cleanup: cleanup send side > + * > + * Close the channel and return memory. > + * > + * @p: Params for the channel that we are using > + */ > +static void zlib_send_cleanup(MultiFDSendParams *p, Error **errp) > +{ > + struct zlib_data *z =3D p->data; > + > + deflateEnd(&z->zs); > + g_free(z->zbuff); > + z->zbuff =3D NULL; > + g_free(p->data); > + p->data =3D NULL; > +} > + > +/** > + * zlib_send_prepare: prepare date to be able to send > + * > + * Create a compressed buffer with all the pages that we are going to > + * send. > + * > + * Returns 0 for success or -1 for error > + * > + * @p: Params for the channel that we are using > + * @used: number of pages used > + */ > +static int zlib_send_prepare(MultiFDSendParams *p, uint32_t used, Error = **errp) > +{ > + struct iovec *iov =3D p->pages->iov; > + struct zlib_data *z =3D p->data; > + z_stream *zs =3D &z->zs; > + uint32_t out_size =3D 0; > + int ret; > + uint32_t i; > + > + for (i =3D 0; i < used; i++) { > + uint32_t available =3D z->zbuff_len - out_size; > + int flush =3D Z_NO_FLUSH; > + > + if (i =3D=3D used - 1) { > + flush =3D Z_SYNC_FLUSH; > + } > + > + zs->avail_in =3D iov[i].iov_len; > + zs->next_in =3D iov[i].iov_base; > + > + zs->avail_out =3D available; > + zs->next_out =3D z->zbuff + out_size; > + > + /* > + * Welcome to deflate semantics > + * > + * We need to loop while: > + * - return is Z_OK > + * - there are stuff to be compressed > + * - there are output space free > + */ > + do { > + ret =3D deflate(zs, flush); > + } while (ret =3D=3D Z_OK && zs->avail_in && zs->avail_out); > + if (ret =3D=3D Z_OK && zs->avail_in) { > + error_setg(errp, "multifd %d: deflate failed to compress all= input", > + p->id); > + return -1; > + } > + if (ret !=3D Z_OK) { > + error_setg(errp, "multifd %d: deflate returned %d instead of= Z_OK", > + p->id, ret); > + return -1; > + } > + out_size +=3D available - zs->avail_out; > + } > + p->next_packet_size =3D out_size; > + p->flags |=3D MULTIFD_FLAG_ZLIB; > + > + return 0; > +} > + > +/** > + * zlib_send_write: do the actual write of the data > + * > + * Do the actual write of the comprresed buffer. > + * > + * Returns 0 for success or -1 for error > + * > + * @p: Params for the channel that we are using > + * @used: number of pages used > + * @errp: pointer to an error > + */ > +static int zlib_send_write(MultiFDSendParams *p, uint32_t used, Error **= errp) > +{ > + struct zlib_data *z =3D p->data; > + > + return qio_channel_write_all(p->c, (void *)z->zbuff, p->next_packet_= size, > + errp); > +} > + > +/** > + * zlib_recv_setup: setup receive side > + * > + * Create the compressed channel and buffer. > + * > + * Returns 0 for success or -1 for error > + * > + * @p: Params for the channel that we are using > + * @errp: pointer to an error > + */ > +static int zlib_recv_setup(MultiFDRecvParams *p, Error **errp) > +{ > + uint32_t page_count =3D MULTIFD_PACKET_SIZE / qemu_target_page_size(= ); > + struct zlib_data *z =3D g_malloc0(sizeof(struct zlib_data)); > + z_stream *zs =3D &z->zs; > + > + p->data =3D z; > + zs->zalloc =3D Z_NULL; > + zs->zfree =3D Z_NULL; > + zs->opaque =3D Z_NULL; > + zs->avail_in =3D 0; > + zs->next_in =3D Z_NULL; > + if (inflateInit(zs) !=3D Z_OK) { > + error_setg(errp, "multifd %d: inflate init failed", p->id); > + return -1; > + } > + /* We will never have more than page_count pages */ > + z->zbuff_len =3D page_count * qemu_target_page_size(); > + /* We know compression "could" use more space */ > + z->zbuff_len *=3D 2; > + z->zbuff =3D g_try_malloc(z->zbuff_len); > + if (!z->zbuff) { > + inflateEnd(zs); > + error_setg(errp, "multifd %d: out of memory for zbuff", p->id); > + return -1; > + } > + return 0; > +} > + > +/** > + * zlib_recv_cleanup: setup receive side > + * > + * For no compression this function does nothing. > + * > + * @p: Params for the channel that we are using > + */ > +static void zlib_recv_cleanup(MultiFDRecvParams *p) > +{ > + struct zlib_data *z =3D p->data; > + > + inflateEnd(&z->zs); > + g_free(z->zbuff); > + z->zbuff =3D NULL; > + g_free(p->data); > + p->data =3D NULL; > +} > + > +/** > + * zlib_recv_pages: read the data from the channel into actual pages > + * > + * Read the compressed buffer, and uncompress it into the actual > + * pages. > + * > + * Returns 0 for success or -1 for error > + * > + * @p: Params for the channel that we are using > + * @used: number of pages used > + * @errp: pointer to an error > + */ > +static int zlib_recv_pages(MultiFDRecvParams *p, uint32_t used, Error **= errp) > +{ > + struct zlib_data *z =3D p->data; > + z_stream *zs =3D &z->zs; > + uint32_t in_size =3D p->next_packet_size; > + /* we measure the change of total_out */ > + uint32_t out_size =3D zs->total_out; > + uint32_t expected_size =3D used * qemu_target_page_size(); > + uint32_t flags =3D p->flags & MULTIFD_FLAG_COMPRESSION_MASK; > + int ret; > + int i; > + > + if (flags !=3D MULTIFD_FLAG_ZLIB) { > + error_setg(errp, "multifd %d: flags received %x flags expected %= x", > + p->id, flags, MULTIFD_FLAG_ZLIB); > + return -1; > + } > + ret =3D qio_channel_read_all(p->c, (void *)z->zbuff, in_size, errp); > + > + if (ret !=3D 0) { > + return ret; > + } > + > + zs->avail_in =3D in_size; > + zs->next_in =3D z->zbuff; > + > + for (i =3D 0; i < used; i++) { > + struct iovec *iov =3D &p->pages->iov[i]; > + int flush =3D Z_NO_FLUSH; > + unsigned long start =3D zs->total_out; > + > + if (i =3D=3D used - 1) { > + flush =3D Z_SYNC_FLUSH; > + } > + > + zs->avail_out =3D iov->iov_len; > + zs->next_out =3D iov->iov_base; > + > + /* > + * Welcome to inflate semantics > + * > + * We need to loop while: > + * - return is Z_OK > + * - there are input available > + * - we haven't completed a full page > + */ > + do { > + ret =3D inflate(zs, flush); > + } while (ret =3D=3D Z_OK && zs->avail_in > + && (zs->total_out - start) < iov->iov_len); > + if (ret =3D=3D Z_OK && (zs->total_out - start) < iov->iov_len) { > + error_setg(errp, "multifd %d: inflate generated too few outp= ut", > + p->id); > + return -1; > + } > + if (ret !=3D Z_OK) { > + error_setg(errp, "multifd %d: inflate returned %d instead of= Z_OK", > + p->id, ret); > + return -1; > + } > + } > + out_size =3D zs->total_out - out_size; > + if (out_size !=3D expected_size) { > + error_setg(errp, "multifd %d: packet size received %d size expec= ted %d", > + p->id, out_size, expected_size); > + return -1; > + } > + return 0; > +} > + > +static MultiFDMethods multifd_zlib_ops =3D { > + .send_setup =3D zlib_send_setup, > + .send_cleanup =3D zlib_send_cleanup, > + .send_prepare =3D zlib_send_prepare, > + .send_write =3D zlib_send_write, > + .recv_setup =3D zlib_recv_setup, > + .recv_cleanup =3D zlib_recv_cleanup, > + .recv_pages =3D zlib_recv_pages > +}; > + > +static void multifd_zlib_register(void) > +{ > + multifd_register_ops(MULTIFD_COMPRESSION_ZLIB, &multifd_zlib_ops); > +} > + > +migration_init(multifd_zlib_register); > diff --git a/migration/multifd.c b/migration/multifd.c > index 97433e5135..cb6a4a3ab8 100644 > --- a/migration/multifd.c > +++ b/migration/multifd.c > @@ -166,6 +166,12 @@ static MultiFDMethods *multifd_ops[MULTIFD_COMPRESSI= ON__MAX] =3D { > [MULTIFD_COMPRESSION_NONE] =3D &multifd_nocomp_ops, > }; > =20 > +void multifd_register_ops(int method, MultiFDMethods *ops) > +{ > + assert(0 < method && method < MULTIFD_COMPRESSION__MAX); > + multifd_ops[method] =3D ops; > +} > + > static int multifd_send_initial_packet(MultiFDSendParams *p, Error **err= p) > { > MultiFDInit_t msg =3D {}; > diff --git a/migration/multifd.h b/migration/multifd.h > index 54075ffa7d..c6dad7b990 100644 > --- a/migration/multifd.h > +++ b/migration/multifd.h > @@ -23,12 +23,14 @@ void multifd_recv_sync_main(void); > void multifd_send_sync_main(QEMUFile *f); > int multifd_queue_page(QEMUFile *f, RAMBlock *block, ram_addr_t offset); > =20 > +/* Multifd Compression flags */ > #define MULTIFD_FLAG_SYNC (1 << 0) > =20 > /* We reserve 3 bits for compression methods */ > #define MULTIFD_FLAG_COMPRESSION_MASK (7 << 1) > /* we need to be compatible. Before compression value was 0 */ > #define MULTIFD_FLAG_NOCOMP (0 << 1) > +#define MULTIFD_FLAG_ZLIB (1 << 1) > =20 > /* This value needs to be a multiple of qemu_target_page_size() */ > #define MULTIFD_PACKET_SIZE (512 * 1024) > @@ -161,5 +163,7 @@ typedef struct { > int (*recv_pages)(MultiFDRecvParams *p, uint32_t used, Error **errp)= ; > } MultiFDMethods; > =20 > +void multifd_register_ops(int method, MultiFDMethods *ops); > + > #endif > =20 > diff --git a/qapi/migration.json b/qapi/migration.json > index 0845d926f2..860609231b 100644 > --- a/qapi/migration.json > +++ b/qapi/migration.json > @@ -494,12 +494,13 @@ > # An enumeration of multifd compression methods. > # > # @none: no compression. > +# @zlib: use zlib compression method. > # > # Since: 5.0 > # > ## > { 'enum': 'MultiFDCompression', > - 'data': [ 'none' ] } > + 'data': [ 'none', 'zlib' ] } > =20 > ## > # @MigrationParameter: > diff --git a/tests/qtest/migration-test.c b/tests/qtest/migration-test.c > index f84c157285..90c26e879f 100644 > --- a/tests/qtest/migration-test.c > +++ b/tests/qtest/migration-test.c > @@ -1323,6 +1323,11 @@ static void test_multifd_tcp_none(void) > test_multifd_tcp("none"); > } > =20 > +static void test_multifd_tcp_zlib(void) > +{ > + test_multifd_tcp("zlib"); > +} > + > /* > * This test does: > * source target > @@ -1486,6 +1491,7 @@ int main(int argc, char **argv) > qtest_add_func("/migration/auto_converge", test_migrate_auto_converg= e); > qtest_add_func("/migration/multifd/tcp/none", test_multifd_tcp_none)= ; > qtest_add_func("/migration/multifd/tcp/cancel", test_multifd_tcp_can= cel); > + qtest_add_func("/migration/multifd/tcp/zlib", test_multifd_tcp_zlib)= ; > =20 > ret =3D g_test_run(); > =20 > --=20 > 2.24.1 >=20 -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK