On 9/29/19 3:40 PM, John Hubbard wrote:
On 9/27/19 4:39 PM, Leonardo Bras wrote:
...
+config LOCKLESS_PAGE_TABLE_WALK_TRACKING + bool "Tracking (and optimization) of lockless page table walkers" + default n + + help + Maintain a reference count of active lockless page table + walkers. This adds 4 bytes to struct mm size, and two atomic + operations to calls such as get_user_pages_fast(). Some + architectures can optimize page table operations if this + is enabled. + endmenu
Actually, the above should be an internal-only config option (PPC arch can auto-select it), so just: +config LOCKLESS_PAGE_TABLE_WALK_TRACKING + bool ...because it's entirely up to other code (as opposed to other people) as to whether this should be selected. I got carried away. :) thanks, -- John Hubbard NVIDIA
