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Try harder to free memory

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Former-commit-id: 48f7c34c91c51ef06d9a1f4e8bc5f1f5cd88cfaa
This commit is contained in:
John Sully 2019-12-14 19:46:39 -05:00
parent fce67c145f
commit 31d42faf27
1 changed files with 24 additions and 23 deletions
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39
src/evict.cpp
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@ -481,7 +481,6 @@ int freeMemoryIfNeeded(void) {
size_t mem_reported, mem_tofree, mem_freed;
mstime_t latency, eviction_latency;
long long delta;
int numtries = 0;
int slaves = listLength(g_pserver->slaves);
/* When clients are paused the dataset should be static not just from the
@ -493,6 +492,14 @@ int freeMemoryIfNeeded(void) {
mem_freed = 0;
size_t maxKeys = 0;
size_t totalKeysFreed = 0;
for (int i = 0; i < cserver.dbnum; ++i)
maxKeys += g_pserver->db[i]->size();
// A random search is n log n, so if we run longer than this we know we're not going to terminate
maxKeys = static_cast<size_t>(maxKeys * (log2(maxKeys)));
if (g_pserver->maxmemory_policy == MAXMEMORY_NO_EVICTION)
goto cant_free; /* We need to free memory, but policy forbids. */
@ -573,19 +580,12 @@ int freeMemoryIfNeeded(void) {
if (g_pserver->maxmemory_policy == MAXMEMORY_ALLKEYS_RANDOM)
{
if (db->size() != 0) {
for (int i = 0; i < 16; ++i)
{
auto itr = db->random_threadsafe();
if (itr.val() != nullptr)
{
bestkey = itr.key();
bestdbid = j;
break;
}
}
break;
}
}
else
{
if (db->expireSize())
@ -606,8 +606,7 @@ int freeMemoryIfNeeded(void) {
{
// This key is in the storage so we only need to free the object
delta = (long long) zmalloc_used_memory();
if (!db->removeCachedValue(bestkey))
keys_freed--; // didn't actuall free this one (we inc below)
db->removeCachedValue(bestkey);
delta -= (long long) zmalloc_used_memory();
mem_freed += delta;
}
@ -640,8 +639,8 @@ int freeMemoryIfNeeded(void) {
decrRefCount(keyobj);
}
if (delta != 0) // delta can be zero if a snapshot has a ref
keys_freed++;
totalKeysFreed++;
/* When the memory to free starts to be big enough, we may
* start spending so much time here that is impossible to
@ -663,16 +662,18 @@ int freeMemoryIfNeeded(void) {
}
}
}
++numtries;
// When using FLASH we're not actually evicting and we leave around the key
// its possible we tried to evict the whole database and failed to free enough memory
// quit if this happens
if (totalKeysFreed >= maxKeys)
{
latencyEndMonitor(latency);
latencyAddSampleIfNeeded("eviction-cycle",latency);
goto cant_free;
}
if (keys_freed <= 0) {
if (g_pserver->m_pstorageFactory != nullptr)
{
// If we have external storage failure to evict doesn't mean there are no
// keys to free
if (bestkey != nullptr && numtries < 16)
continue;
}
latencyEndMonitor(latency);
latencyAddSampleIfNeeded("eviction-cycle",latency);
goto cant_free; /* nothing to free... */