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rdma: introduce ram_handle_compressed() 

This gives RDMA shared access to madvise() on the destination side
when an entire chunk is found to be zero.

Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Chegu Vinod <chegu_vinod@hp.com>
Tested-by: Chegu Vinod <chegu_vinod@hp.com>
Tested-by: Michael R. Hines <mrhines@us.ibm.com>
Signed-off-by: Michael R. Hines <mrhines@us.ibm.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Michael R. Hines 2013-07-22 10:01:53 -04:00 committed by Juan Quintela
parent de7b685c9e
commit 44c3b58cf9
2 changed files with 21 additions and 10 deletions
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29
arch_init.c
View File

@ -808,6 +808,24 @@ static inline void *host_from_stream_offset(QEMUFile *f,
return NULL;
}
/*
* If a page (or a whole RDMA chunk) has been
* determined to be zero, then zap it.
*/
void ram_handle_compressed(void *host, uint8_t ch, uint64_t size)
{
if (ch != 0 || !is_zero_page(host)) {
memset(host, ch, size);
#ifndef _WIN32
if (ch == 0 &&
(!kvm_enabled() || kvm_has_sync_mmu()) &&
getpagesize() <= TARGET_PAGE_SIZE) {
qemu_madvise(host, TARGET_PAGE_SIZE, QEMU_MADV_DONTNEED);
}
#endif
}
}
static int ram_load(QEMUFile *f, void *opaque, int version_id)
{
ram_addr_t addr;
@ -879,16 +897,7 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id)
}
ch = qemu_get_byte(f);
if (ch != 0 || !is_zero_page(host)) {
memset(host, ch, TARGET_PAGE_SIZE);
#ifndef _WIN32
if (ch == 0 &&
(!kvm_enabled() || kvm_has_sync_mmu()) &&
getpagesize() <= TARGET_PAGE_SIZE) {
qemu_madvise(host, TARGET_PAGE_SIZE, QEMU_MADV_DONTNEED);
}
#endif
}
ram_handle_compressed(host, ch, TARGET_PAGE_SIZE);
} else if (flags & RAM_SAVE_FLAG_PAGE) {
void *host;

2
include/migration/migration.h
View File

@ -109,6 +109,8 @@ uint64_t xbzrle_mig_pages_transferred(void);
uint64_t xbzrle_mig_pages_overflow(void);
uint64_t xbzrle_mig_pages_cache_miss(void);
void ram_handle_compressed(void *host, uint8_t ch, uint64_t size);
/**
* @migrate_add_blocker - prevent migration from proceeding
*