Michel Lespinasse <walken@xxxxxxxxxx> wrote: > and looks like it's doable with the x86 rwsem implementation as well in a > way that would only involve changes to the rwsem spinlock-protected slow > paths in lib/rwsem.c . It's not as easy as it seems. Once an XADD-based rwsem is contended, you cannot necessarily tell without looking at the queue whether the rwsem is currently write-locked or read-locked. David -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>