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memory: avoid unnecessary coalesced_io_del operations 

Store whether the FlatRange has had any coalesced I/O ranges applied,
and if not avoid calling coalesced_io_del.  This is useful in preparation
for the next patch, which will call coalesced_io_del when rendering
memory regions.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2018-11-28 17:29:45 +01:00
parent 909bf76302
commit 1f7af80429
1 changed files with 11 additions and 0 deletions
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11
memory.c
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@ -217,6 +217,7 @@ struct FlatRange {
bool romd_mode;
bool readonly;
bool nonvolatile;
bool has_coalesced_range;
};
#define FOR_EACH_FLAT_RANGE(var, view) \
@ -650,6 +651,7 @@ static void render_memory_region(FlatView *view,
fr.romd_mode = mr->romd_mode;
fr.readonly = readonly;
fr.nonvolatile = nonvolatile;
fr.has_coalesced_range = false;
/* Render the region itself into any gaps left by the current view. */
for (i = 0; i < view->nr && int128_nz(remain); ++i) {
@ -852,6 +854,10 @@ static void address_space_update_ioeventfds(AddressSpace *as)
static void flat_range_coalesced_io_del(FlatRange *fr, AddressSpace *as)
{
if (!fr->has_coalesced_range) {
return;
}
MEMORY_LISTENER_UPDATE_REGION(fr, as, Reverse, coalesced_io_del,
int128_get64(fr->addr.start),
int128_get64(fr->addr.size));
@ -863,6 +869,11 @@ static void flat_range_coalesced_io_add(FlatRange *fr, AddressSpace *as)
CoalescedMemoryRange *cmr;
AddrRange tmp;
if (QTAILQ_EMPTY(&mr->coalesced)) {
return;
}
fr->has_coalesced_range = true;
QTAILQ_FOREACH(cmr, &mr->coalesced, link) {
tmp = addrrange_shift(cmr->addr,
int128_sub(fr->addr.start,