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Szmigiero" Subject: [PATCH v3 07/14] migration/multifd: Replace p->pages with an union pointer Date: Thu, 1 Aug 2024 09:35:09 -0300 Message-Id: <20240801123516.4498-8-farosas@suse.de> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20240801123516.4498-1-farosas@suse.de> References: <20240801123516.4498-1-farosas@suse.de> MIME-Version: 1.0 X-Spamd-Result: default: False [-2.60 / 50.00]; BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; MIME_GOOD(-0.10)[text/plain]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; TO_DN_SOME(0.00)[]; MIME_TRACE(0.00)[0:+]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FUZZY_BLOCKED(0.00)[rspamd.com]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; FROM_EQ_ENVFROM(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:email]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[] Received-SPF: pass client-ip=2a07:de40:b251:101:10:150:64:1; envelope-from=farosas@suse.de; helo=smtp-out1.suse.de X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org We want multifd to be able to handle more types of data than just ram pages. To start decoupling multifd from pages, replace p->pages (MultiFDPages_t) with the new type MultiFDSendData that hides the client payload inside an union. The general idea here is to isolate functions that *need* to handle MultiFDPages_t and move them in the future to multifd-ram.c, while multifd.c will stay with only the core functions that handle MultiFDSendData/MultiFDRecvData. Signed-off-by: Fabiano Rosas Reviewed-by: Peter Xu --- migration/multifd-qpl.c | 6 +-- migration/multifd-uadk.c | 2 +- migration/multifd-zero-page.c | 2 +- migration/multifd-zlib.c | 2 +- migration/multifd-zstd.c | 2 +- migration/multifd.c | 85 ++++++++++++++++++++--------------- migration/multifd.h | 7 +-- 7 files changed, 57 insertions(+), 49 deletions(-) diff --git a/migration/multifd-qpl.c b/migration/multifd-qpl.c index db60c05795..21153f1987 100644 --- a/migration/multifd-qpl.c +++ b/migration/multifd-qpl.c @@ -406,7 +406,7 @@ retry: static void multifd_qpl_compress_pages_slow_path(MultiFDSendParams *p) { QplData *qpl = p->compress_data; - MultiFDPages_t *pages = p->pages; + MultiFDPages_t *pages = &p->data->u.ram; uint32_t size = p->page_size; qpl_job *job = qpl->sw_job; uint8_t *zbuf = qpl->zbuf; @@ -437,7 +437,7 @@ static void multifd_qpl_compress_pages_slow_path(MultiFDSendParams *p) static void multifd_qpl_compress_pages(MultiFDSendParams *p) { QplData *qpl = p->compress_data; - MultiFDPages_t *pages = p->pages; + MultiFDPages_t *pages = &p->data->u.ram; uint32_t size = p->page_size; QplHwJob *hw_job; uint8_t *buf; @@ -501,7 +501,7 @@ static void multifd_qpl_compress_pages(MultiFDSendParams *p) static int multifd_qpl_send_prepare(MultiFDSendParams *p, Error **errp) { QplData *qpl = p->compress_data; - MultiFDPages_t *pages = p->pages; + MultiFDPages_t *pages = &p->data->u.ram; uint32_t len = 0; if (!multifd_send_prepare_common(p)) { diff --git a/migration/multifd-uadk.c b/migration/multifd-uadk.c index 1ed1c6afe6..9d99807af5 100644 --- a/migration/multifd-uadk.c +++ b/migration/multifd-uadk.c @@ -177,7 +177,7 @@ static int multifd_uadk_send_prepare(MultiFDSendParams *p, Error **errp) uint32_t page_size = multifd_ram_page_size(); uint8_t *buf = uadk_data->buf; int ret = 0; - MultiFDPages_t *pages = p->pages; + MultiFDPages_t *pages = &p->data->u.ram; if (!multifd_send_prepare_common(p)) { goto out; diff --git a/migration/multifd-zero-page.c b/migration/multifd-zero-page.c index cc624e36b3..6506a4aa89 100644 --- a/migration/multifd-zero-page.c +++ b/migration/multifd-zero-page.c @@ -46,7 +46,7 @@ static void swap_page_offset(ram_addr_t *pages_offset, int a, int b) */ void multifd_send_zero_page_detect(MultiFDSendParams *p) { - MultiFDPages_t *pages = p->pages; + MultiFDPages_t *pages = &p->data->u.ram; RAMBlock *rb = pages->block; int i = 0; int j = pages->num - 1; diff --git a/migration/multifd-zlib.c b/migration/multifd-zlib.c index e47d7f70dc..66517c1067 100644 --- a/migration/multifd-zlib.c +++ b/migration/multifd-zlib.c @@ -123,7 +123,7 @@ static void zlib_send_cleanup(MultiFDSendParams *p, Error **errp) */ static int zlib_send_prepare(MultiFDSendParams *p, Error **errp) { - MultiFDPages_t *pages = p->pages; + MultiFDPages_t *pages = &p->data->u.ram; struct zlib_data *z = p->compress_data; z_stream *zs = &z->zs; uint32_t out_size = 0; diff --git a/migration/multifd-zstd.c b/migration/multifd-zstd.c index 1812fd1b48..04ac711cf4 100644 --- a/migration/multifd-zstd.c +++ b/migration/multifd-zstd.c @@ -119,7 +119,7 @@ static void zstd_send_cleanup(MultiFDSendParams *p, Error **errp) */ static int zstd_send_prepare(MultiFDSendParams *p, Error **errp) { - MultiFDPages_t *pages = p->pages; + MultiFDPages_t *pages = &p->data->u.ram; struct zstd_data *z = p->compress_data; int ret; uint32_t i; diff --git a/migration/multifd.c b/migration/multifd.c index 64503604cf..8771cda734 100644 --- a/migration/multifd.c +++ b/migration/multifd.c @@ -49,8 +49,7 @@ typedef struct { struct { MultiFDSendParams *params; - /* array of pages to sent */ - MultiFDPages_t *pages; + MultiFDSendData *data; /* * Global number of generated multifd packets. * @@ -109,6 +108,28 @@ static size_t multifd_ram_payload_size(void) return sizeof(MultiFDPages_t) + n * sizeof(ram_addr_t); } +static MultiFDSendData *multifd_send_data_alloc(void) +{ + size_t max_payload_size, size_minus_payload; + + /* + * MultiFDPages_t has a flexible array at the end, account for it + * when allocating MultiFDSendData. Use max() in case other types + * added to the union in the future are larger than + * (MultiFDPages_t + flex array). + */ + max_payload_size = MAX(multifd_ram_payload_size(), sizeof(MultiFDPayload)); + + /* + * Account for any holes the compiler might insert. We can't pack + * the structure because that misaligns the members and triggers + * Waddress-of-packed-member. + */ + size_minus_payload = sizeof(MultiFDSendData) - sizeof(MultiFDPayload); + + return g_malloc0(size_minus_payload + max_payload_size); +} + static bool multifd_use_packets(void) { return !migrate_mapped_ram(); @@ -121,7 +142,7 @@ void multifd_send_channel_created(void) static void multifd_set_file_bitmap(MultiFDSendParams *p) { - MultiFDPages_t *pages = p->pages; + MultiFDPages_t *pages = &p->data->u.ram; assert(pages->block); @@ -177,7 +198,7 @@ static void nocomp_send_cleanup(MultiFDSendParams *p, Error **errp) static void multifd_send_prepare_iovs(MultiFDSendParams *p) { - MultiFDPages_t *pages = p->pages; + MultiFDPages_t *pages = &p->data->u.ram; uint32_t page_size = multifd_ram_page_size(); for (int i = 0; i < pages->normal_num; i++) { @@ -403,23 +424,10 @@ static int multifd_recv_initial_packet(QIOChannel *c, Error **errp) return msg.id; } -static MultiFDPages_t *multifd_pages_init(uint32_t n) -{ - MultiFDPages_t *pages = g_malloc0(multifd_ram_payload_size()); - - return pages; -} - -static void multifd_pages_clear(MultiFDPages_t *pages) -{ - multifd_pages_reset(pages); - g_free(pages); -} - void multifd_send_fill_packet(MultiFDSendParams *p) { MultiFDPacket_t *packet = p->packet; - MultiFDPages_t *pages = p->pages; + MultiFDPages_t *pages = &p->data->u.ram; uint64_t packet_num; uint32_t zero_num = pages->num - pages->normal_num; int i; @@ -601,7 +609,7 @@ static bool multifd_send_pages(void) int i; static int next_channel; MultiFDSendParams *p = NULL; /* make happy gcc */ - MultiFDPages_t *pages = multifd_send_state->pages; + MultiFDSendData *tmp; if (multifd_send_should_exit()) { return false; @@ -636,11 +644,14 @@ static bool multifd_send_pages(void) * qatomic_store_release() in multifd_send_thread(). */ smp_mb_acquire(); - assert(!p->pages->num); - multifd_send_state->pages = p->pages; - p->pages = pages; + + assert(!p->data->u.ram.num); + + tmp = multifd_send_state->data; + multifd_send_state->data = p->data; + p->data = tmp; /* - * Making sure p->pages is setup before marking pending_job=true. Pairs + * Making sure p->data is setup before marking pending_job=true. Pairs * with the qatomic_load_acquire() in multifd_send_thread(). */ qatomic_store_release(&p->pending_job, true); @@ -670,7 +681,7 @@ bool multifd_queue_page(RAMBlock *block, ram_addr_t offset) MultiFDPages_t *pages; retry: - pages = multifd_send_state->pages; + pages = &multifd_send_state->data->u.ram; /* If the queue is empty, we can already enqueue now */ if (multifd_queue_empty(pages)) { @@ -800,8 +811,8 @@ static bool multifd_send_cleanup_channel(MultiFDSendParams *p, Error **errp) qemu_sem_destroy(&p->sem_sync); g_free(p->name); p->name = NULL; - multifd_pages_clear(p->pages); - p->pages = NULL; + g_free(p->data); + p->data = NULL; p->packet_len = 0; g_free(p->packet); p->packet = NULL; @@ -818,8 +829,8 @@ static void multifd_send_cleanup_state(void) qemu_sem_destroy(&multifd_send_state->channels_ready); g_free(multifd_send_state->params); multifd_send_state->params = NULL; - multifd_pages_clear(multifd_send_state->pages); - multifd_send_state->pages = NULL; + g_free(multifd_send_state->data); + multifd_send_state->data = NULL; g_free(multifd_send_state); multifd_send_state = NULL; } @@ -868,11 +879,13 @@ int multifd_send_sync_main(void) { int i; bool flush_zero_copy; + MultiFDPages_t *pages; if (!migrate_multifd()) { return 0; } - if (multifd_send_state->pages->num) { + pages = &multifd_send_state->data->u.ram; + if (pages->num) { if (!multifd_send_pages()) { error_report("%s: multifd_send_pages fail", __func__); return -1; @@ -947,11 +960,11 @@ static void *multifd_send_thread(void *opaque) } /* - * Read pending_job flag before p->pages. Pairs with the + * Read pending_job flag before p->data. Pairs with the * qatomic_store_release() in multifd_send_pages(). */ if (qatomic_load_acquire(&p->pending_job)) { - MultiFDPages_t *pages = p->pages; + MultiFDPages_t *pages = &p->data->u.ram; p->iovs_num = 0; assert(pages->num); @@ -963,7 +976,7 @@ static void *multifd_send_thread(void *opaque) if (migrate_mapped_ram()) { ret = file_write_ramblock_iov(p->c, p->iov, p->iovs_num, - pages, &local_err); + &p->data->u.ram, &local_err); } else { ret = qio_channel_writev_full_all(p->c, p->iov, p->iovs_num, NULL, 0, p->write_flags, @@ -983,7 +996,7 @@ static void *multifd_send_thread(void *opaque) p->next_packet_size = 0; /* - * Making sure p->pages is published before saying "we're + * Making sure p->data is published before saying "we're * free". Pairs with the smp_mb_acquire() in * multifd_send_pages(). */ @@ -1179,7 +1192,7 @@ bool multifd_send_setup(void) thread_count = migrate_multifd_channels(); multifd_send_state = g_malloc0(sizeof(*multifd_send_state)); multifd_send_state->params = g_new0(MultiFDSendParams, thread_count); - multifd_send_state->pages = multifd_pages_init(page_count); + multifd_send_state->data = multifd_send_data_alloc(); qemu_sem_init(&multifd_send_state->channels_created, 0); qemu_sem_init(&multifd_send_state->channels_ready, 0); qatomic_set(&multifd_send_state->exiting, 0); @@ -1191,7 +1204,7 @@ bool multifd_send_setup(void) qemu_sem_init(&p->sem, 0); qemu_sem_init(&p->sem_sync, 0); p->id = i; - p->pages = multifd_pages_init(page_count); + p->data = multifd_send_data_alloc(); if (use_packets) { p->packet_len = sizeof(MultiFDPacket_t) + sizeof(uint64_t) * page_count; @@ -1689,7 +1702,7 @@ void multifd_recv_new_channel(QIOChannel *ioc, Error **errp) bool multifd_send_prepare_common(MultiFDSendParams *p) { - MultiFDPages_t *pages = p->pages; + MultiFDPages_t *pages = &p->data->u.ram; multifd_send_zero_page_detect(p); if (!pages->normal_num) { diff --git a/migration/multifd.h b/migration/multifd.h index a7fdd97f70..c2ba4cad13 100644 --- a/migration/multifd.h +++ b/migration/multifd.h @@ -152,12 +152,7 @@ typedef struct { */ bool pending_job; bool pending_sync; - /* array of pages to sent. - * The owner of 'pages' depends of 'pending_job' value: - * pending_job == 0 -> migration_thread can use it. - * pending_job != 0 -> multifd_channel can use it. - */ - MultiFDPages_t *pages; + MultiFDSendData *data; /* thread local variables. No locking required */