On Mon, 2012-04-16 at 01:44 +0200, Oleg Nesterov wrote: > No. Please note that if is_swbp_at_addr_fast() sets is_swbp == 0 we > restart this insn. Ah, see I was missing something.. Hmm ok, let me think about this a little more though.. but at least I think I'm now (finally!) seeing what you propose. > And. I have another reason for down_write() in register/unregister. > I am still not sure this is possible (I had no time to try to > implement), but it seems to me we can kill the uprobe counter in > mm_struct. You mean by making register/unregister down_write, you're exclusive with munmap() and thus we can rely on is_swbp_at_addr_fast() to inspect the address to see if there's a breakpoint or not and avoid the rest of the work that way? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href