migration: introduce control_save_page()
Abstract the common function control_save_page() to cleanup the code, no logic is changed Reviewed-by: Peter Xu <peterx@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Xiao Guangrong <xiaoguangrong@tencent.com> Message-Id: <20180330075128.26919-6-xiaoguangrong@tencent.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Xiao Guangrong
Dr. David Alan Gilbert
parent
34ab9e9743
commit
059ff0fb29
174
migration/ram.c
174
migration/ram.c
@ -974,6 +974,44 @@ static void ram_release_pages(const char *rbname, uint64_t offset, int pages)
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ram_discard_range(rbname, offset, pages << TARGET_PAGE_BITS);
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}
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/*
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* @pages: the number of pages written by the control path,
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* < 0 - error
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* > 0 - number of pages written
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*
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* Return true if the pages has been saved, otherwise false is returned.
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*/
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static bool control_save_page(RAMState *rs, RAMBlock *block, ram_addr_t offset,
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int *pages)
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{
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uint64_t bytes_xmit = 0;
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int ret;
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*pages = -1;
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ret = ram_control_save_page(rs->f, block->offset, offset, TARGET_PAGE_SIZE,
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&bytes_xmit);
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if (ret == RAM_SAVE_CONTROL_NOT_SUPP) {
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return false;
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}
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if (bytes_xmit) {
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ram_counters.transferred += bytes_xmit;
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*pages = 1;
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}
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if (ret == RAM_SAVE_CONTROL_DELAYED) {
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return true;
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}
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if (bytes_xmit > 0) {
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ram_counters.normal++;
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} else if (bytes_xmit == 0) {
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ram_counters.duplicate++;
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}
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return true;
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}
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/**
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* ram_save_page: send the given page to the stream
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*
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@ -990,56 +1028,36 @@ static void ram_release_pages(const char *rbname, uint64_t offset, int pages)
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static int ram_save_page(RAMState *rs, PageSearchStatus *pss, bool last_stage)
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{
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int pages = -1;
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uint64_t bytes_xmit;
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ram_addr_t current_addr;
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uint8_t *p;
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int ret;
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bool send_async = true;
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RAMBlock *block = pss->block;
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ram_addr_t offset = pss->page << TARGET_PAGE_BITS;
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ram_addr_t current_addr = block->offset + offset;
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p = block->host + offset;
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trace_ram_save_page(block->idstr, (uint64_t)offset, p);
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/* In doubt sent page as normal */
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bytes_xmit = 0;
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ret = ram_control_save_page(rs->f, block->offset,
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offset, TARGET_PAGE_SIZE, &bytes_xmit);
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if (bytes_xmit) {
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ram_counters.transferred += bytes_xmit;
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pages = 1;
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if (control_save_page(rs, block, offset, &pages)) {
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return pages;
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}
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XBZRLE_cache_lock();
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current_addr = block->offset + offset;
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if (ret != RAM_SAVE_CONTROL_NOT_SUPP) {
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if (ret != RAM_SAVE_CONTROL_DELAYED) {
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if (bytes_xmit > 0) {
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ram_counters.normal++;
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} else if (bytes_xmit == 0) {
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ram_counters.duplicate++;
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}
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}
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} else {
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pages = save_zero_page(rs, block, offset);
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if (pages > 0) {
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/* Must let xbzrle know, otherwise a previous (now 0'd) cached
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* page would be stale
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pages = save_zero_page(rs, block, offset);
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if (pages > 0) {
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/* Must let xbzrle know, otherwise a previous (now 0'd) cached
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* page would be stale
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*/
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xbzrle_cache_zero_page(rs, current_addr);
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ram_release_pages(block->idstr, offset, pages);
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} else if (!rs->ram_bulk_stage &&
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!migration_in_postcopy() && migrate_use_xbzrle()) {
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pages = save_xbzrle_page(rs, &p, current_addr, block,
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offset, last_stage);
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if (!last_stage) {
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/* Can't send this cached data async, since the cache page
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* might get updated before it gets to the wire
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*/
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xbzrle_cache_zero_page(rs, current_addr);
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ram_release_pages(block->idstr, offset, pages);
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} else if (!rs->ram_bulk_stage &&
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!migration_in_postcopy() && migrate_use_xbzrle()) {
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pages = save_xbzrle_page(rs, &p, current_addr, block,
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offset, last_stage);
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if (!last_stage) {
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/* Can't send this cached data async, since the cache page
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* might get updated before it gets to the wire
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*/
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send_async = false;
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}
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send_async = false;
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}
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}
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@ -1174,63 +1192,49 @@ static int ram_save_compressed_page(RAMState *rs, PageSearchStatus *pss,
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bool last_stage)
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{
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int pages = -1;
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uint64_t bytes_xmit = 0;
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uint8_t *p;
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int ret;
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RAMBlock *block = pss->block;
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ram_addr_t offset = pss->page << TARGET_PAGE_BITS;
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p = block->host + offset;
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ret = ram_control_save_page(rs->f, block->offset,
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offset, TARGET_PAGE_SIZE, &bytes_xmit);
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if (bytes_xmit) {
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ram_counters.transferred += bytes_xmit;
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pages = 1;
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if (control_save_page(rs, block, offset, &pages)) {
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return pages;
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}
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if (ret != RAM_SAVE_CONTROL_NOT_SUPP) {
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if (ret != RAM_SAVE_CONTROL_DELAYED) {
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if (bytes_xmit > 0) {
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ram_counters.normal++;
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} else if (bytes_xmit == 0) {
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ram_counters.duplicate++;
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}
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/* When starting the process of a new block, the first page of
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* the block should be sent out before other pages in the same
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* block, and all the pages in last block should have been sent
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* out, keeping this order is important, because the 'cont' flag
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* is used to avoid resending the block name.
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*/
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if (block != rs->last_sent_block) {
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flush_compressed_data(rs);
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pages = save_zero_page(rs, block, offset);
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if (pages > 0) {
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ram_release_pages(block->idstr, offset, pages);
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} else {
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/*
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* Make sure the first page is sent out before other pages.
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*
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* we post it as normal page as compression will take much
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* CPU resource.
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*/
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ram_counters.transferred += save_page_header(rs, rs->f, block,
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offset | RAM_SAVE_FLAG_PAGE);
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qemu_put_buffer_async(rs->f, p, TARGET_PAGE_SIZE,
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migrate_release_ram() &
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migration_in_postcopy());
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ram_counters.transferred += TARGET_PAGE_SIZE;
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ram_counters.normal++;
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pages = 1;
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}
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} else {
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/* When starting the process of a new block, the first page of
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* the block should be sent out before other pages in the same
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* block, and all the pages in last block should have been sent
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* out, keeping this order is important, because the 'cont' flag
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* is used to avoid resending the block name.
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*/
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if (block != rs->last_sent_block) {
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flush_compressed_data(rs);
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pages = save_zero_page(rs, block, offset);
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if (pages > 0) {
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ram_release_pages(block->idstr, offset, pages);
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} else {
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/*
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* Make sure the first page is sent out before other pages.
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*
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* we post it as normal page as compression will take much
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* CPU resource.
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*/
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ram_counters.transferred += save_page_header(rs, rs->f, block,
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offset | RAM_SAVE_FLAG_PAGE);
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qemu_put_buffer_async(rs->f, p, TARGET_PAGE_SIZE,
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migrate_release_ram() &
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migration_in_postcopy());
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ram_counters.transferred += TARGET_PAGE_SIZE;
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ram_counters.normal++;
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pages = 1;
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}
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pages = save_zero_page(rs, block, offset);
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if (pages == -1) {
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pages = compress_page_with_multi_thread(rs, block, offset);
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} else {
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pages = save_zero_page(rs, block, offset);
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if (pages == -1) {
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pages = compress_page_with_multi_thread(rs, block, offset);
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} else {
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ram_release_pages(block->idstr, offset, pages);
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}
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ram_release_pages(block->idstr, offset, pages);
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}
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}
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