Hello, Thanks for the report. On Wed, Oct 26, 2016 at 03:06:05PM +0200, Sascha Silbe wrote: > Dear Joonsoo, > > Joonsoo Kim <js1304@xxxxxxxxx> writes: > > > Currently, we store each page's allocation stacktrace on corresponding > > page_ext structure and it requires a lot of memory. This causes the > > problem that memory tight system doesn't work well if page_owner is > > enabled. Moreover, even with this large memory consumption, we cannot get > > full stacktrace because we allocate memory at boot time and just maintain > > 8 stacktrace slots to balance memory consumption. We could increase it to > > more but it would make system unusable or change system behaviour. > [...] > > This patch causes my Wandboard Quad [1] not to boot anymore. I don't get > any kernel output, even with earlycon enabled > (earlycon=ec_imx6q,0x02020000). git bisect pointed towards your patch; > reverting the patch causes the system to boot fine again. Config is > available at [2]; none of the defconfigs I tried (defconfig = > multi_v7_defconfig, imx_v6_v7_defconfig) works for me. > > Haven't looked into this any further so far; hooking up a JTAG adapter > requires some hardware changes as the JTAG header is unpopulated. > > Sascha > > PS: Please CC me on replies; I'm not subscribed to any of the lists. > > [1] http://www.wandboard.org/index.php/details/wandboard > [2] https://sascha.silbe.org/tmp/config-4.8.4-wandboard-28-00003-g9e9b5d6 > -- > Softwareentwicklung Sascha Silbe, Niederhofenstraße 5/1, 71229 Leonberg > https://se-silbe.de/ > USt-IdNr.: DE281696641 I cannot see your config. Link [2] shows "No such file or directory" Anyway, I find that there is an issue in early boot phase in !CONFIG_SPARSEMEM. Could you try following one? (It's an completely untested patch, even I don't try to compile it.) Thanks. ---------->8--------------- diff --git a/include/linux/page_ext.h b/include/linux/page_ext.h index 9298c39..db31f58 100644 --- a/include/linux/page_ext.h +++ b/include/linux/page_ext.h @@ -47,6 +47,7 @@ struct page_ext { }; extern void pgdat_page_ext_init(struct pglist_data *pgdat); +extern void __init invoke_init_callbacks(void); #ifdef CONFIG_SPARSEMEM static inline void page_ext_init_flatmem(void) @@ -57,6 +58,7 @@ static inline void page_ext_init_flatmem(void) extern void page_ext_init_flatmem(void); static inline void page_ext_init(void) { + invoke_init_callbacks(); } #endif diff --git a/mm/page_ext.c b/mm/page_ext.c index 121dcff..a405869 100644 --- a/mm/page_ext.c +++ b/mm/page_ext.c @@ -91,7 +91,7 @@ static bool __init invoke_need_callbacks(void) return need; } -static void __init invoke_init_callbacks(void) +void __init invoke_init_callbacks(void) { int i; int entries = ARRAY_SIZE(page_ext_ops); @@ -190,7 +190,6 @@ void __init page_ext_init_flatmem(void) goto fail; } pr_info("allocated %ld bytes of page_ext\n", total_usage); - invoke_init_callbacks(); return; fail: -- 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>