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Track why we're evicting from caches (#10829)

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So we can see distinguish between "evicting because the cache is too big" and "evicting because the cache entries haven't been recently used".
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David Robertson 2021-09-22 10:59:52 +01:00 • committed by GitHub
parent 51e2db3598
commit a2d7195e01
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4 changed files with 31 additions and 15 deletions
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synapse/util/caches/expiringcache.py
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@ -22,7 +22,7 @@ from typing_extensions import Literal
from synapse.config import cache as cache_config
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.util import Clock
from synapse.util.caches import register_cache
from synapse.util.caches import EvictionReason, register_cache
logger = logging.getLogger(__name__)
@ -98,9 +98,9 @@ class ExpiringCache(Generic[KT, VT]):
while self._max_size and len(self) > self._max_size:
_key, value = self._cache.popitem(last=False)
if self.iterable:
self.metrics.inc_evictions(len(value.value))
self.metrics.inc_evictions(EvictionReason.size, len(value.value))
else:
self.metrics.inc_evictions()
self.metrics.inc_evictions(EvictionReason.size)
def __getitem__(self, key: KT) -> VT:
try:
@ -175,9 +175,9 @@ class ExpiringCache(Generic[KT, VT]):
for k in keys_to_delete:
value = self._cache.pop(k)
if self.iterable:
self.metrics.inc_evictions(len(value.value))
self.metrics.inc_evictions(EvictionReason.time, len(value.value))
else:
self.metrics.inc_evictions()
self.metrics.inc_evictions(EvictionReason.time)
logger.debug(
"[%s] _prune_cache before: %d, after len: %d",