On Mon, 24 Nov 2014 17:15:21 +0900 Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> wrote: > Now, we have prepared to avoid using debug-pagealloc in boottime. So > introduce new kernel-parameter to disable debug-pagealloc in boottime, > and makes related functions to be disabled in this case. > > Only non-intuitive part is change of guard page functions. Because > guard page is effective only if debug-pagealloc is enabled, turning off > according to debug-pagealloc is reasonable thing to do. > > ... > > --- a/Documentation/kernel-parameters.txt > +++ b/Documentation/kernel-parameters.txt > @@ -858,6 +858,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted. > causing system reset or hang due to sending > INIT from AP to BSP. > > + disable_debug_pagealloc > + [KNL] When CONFIG_DEBUG_PAGEALLOC is set, this > + parameter allows user to disable it at boot time. > + With this parameter, we can avoid allocating huge > + chunk of memory for debug pagealloc and then > + the system will work mostly same with the kernel > + built without CONFIG_DEBUG_PAGEALLOC. > + Weren't we going to make this default to "off", require a boot option to turn debug_pagealloc on? -- 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/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>