search for: wait_on_bit

...semaphore to the fat node structures to keep the current behaviour, and merged a patch from Jan Kara to remove the i_alloc_sem abuse from ext4. changes from v1: - update the fat patch description - replace my ext4 truncate_lock patch with Jan''s rewrite of ext4_page_mkwrite - do not use wait_on_bit, but replace it with an opencoded hashed waitqueue - rename inode_dio_wake to inode_dio_done - add kerneldoc comments for inode_dio_wait and inode_dio_done - simplify the blockdev_direct_IO prototype - move the i_dio_count decrement into the ->end_io handler if present to make i_dio_count...

...signed long map_hva) +{ + struct page_db *pdb; + int result; + + spin_lock(&fdb->lock); + + pdb = client_db_hva_search(fdb, map_hva); + if (likely(pdb != NULL)) + refcount_inc(&pdb->refcnt); + + spin_unlock(&fdb->lock); + + if (pdb == NULL) + return NULL; + +retry: + result = wait_on_bit((unsigned long *)&pdb->flags, BUSY_BIT, + TASK_KILLABLE); + /* non-zero if interrupted by a signal */ + if (unlikely(result != 0)) + return ERR_PTR(-EINTR); + + /* try set bit & spin if failed */ + if (test_and_set_bit(BUSY_BIT, (unsigned long *)&pdb->flags)) + goto retry...

The KVM introspection subsystem provides a facility for applications running on the host or in a separate VM, to control the execution of other VM-s (pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.), alter the page access bits in the shadow page tables (only for the hardware backed ones, eg. Intel's EPT) and receive notifications when events of interest have taken place

The KVM introspection subsystem provides a facility for applications running on the host or in a separate VM, to control the execution of other VM-s (pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.), alter the page access bits in the shadow page tables (only for the hardware backed ones, eg. Intel's EPT) and receive notifications when events of interest have taken place