# Buffers & SLRU (The Page Nudges)
These are the most common LWLocks. They occur when two elephants are trying to look at the same **[[Structures/Page|Page]]** in the Shared Buffer brain at the same time.
![[BtreeVacuum]]
![[BufferContent]]
![[BufferMapping]]
![[CommitTs]]
![[CommitTsBuffer]]
![[CommitTsSLRU]]
![[ControlFile]]
![[LogicalRepWorker]]
![[RelationMapping]]
![[RelCacheInit]]
![[SerialBuffer]]
![[SerialSLRU]]
![[SharedTidBitmap]]
![[SharedTupleStore]]
![[SubtransBuffer]]
![[SubtransSLRU]]
![[XactBuffer]]
![[XactSLRU]]
![[XactTruncation]]