Heiko Carstens <heiko.carst...@de.ibm.com> writes: > On Fri, Mar 24, 2017 at 03:19:52PM -0400, Pavel Tatashin wrote: >> If we are using deferred struct page initialization feature, most of >> "struct page"es are getting initialized after other CPUs are started, and >> hence we are benefiting from doing this job in parallel. However, we are >> still zeroing all the memory that is allocated for "struct pages" using the >> boot CPU. This patch solves this problem, by deferring zeroing "struct >> pages" to only when they are initialized. >> >> Signed-off-by: Pavel Tatashin <pasha.tatas...@oracle.com> >> Reviewed-by: Shannon Nelson <shannon.nel...@oracle.com> >> --- >> arch/powerpc/mm/init_64.c | 2 +- >> arch/s390/mm/vmem.c | 2 +- >> arch/sparc/mm/init_64.c | 2 +- >> arch/x86/mm/init_64.c | 2 +- >> 4 files changed, 4 insertions(+), 4 deletions(-) >> >> diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c >> index eb4c270..24faf2d 100644 >> --- a/arch/powerpc/mm/init_64.c >> +++ b/arch/powerpc/mm/init_64.c >> @@ -181,7 +181,7 @@ int __meminit vmemmap_populate(unsigned long start, >> unsigned long end, int node) >> if (vmemmap_populated(start, page_size)) >> continue; >> >> - p = vmemmap_alloc_block(page_size, node, true); >> + p = vmemmap_alloc_block(page_size, node, VMEMMAP_ZERO); >> if (!p) >> return -ENOMEM; >> >> diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c >> index 9c75214..ffe9ba1 100644 >> --- a/arch/s390/mm/vmem.c >> +++ b/arch/s390/mm/vmem.c >> @@ -252,7 +252,7 @@ int __meminit vmemmap_populate(unsigned long start, >> unsigned long end, int node) >> void *new_page; >> >> new_page = vmemmap_alloc_block(PMD_SIZE, node, >> - true); >> + VMEMMAP_ZERO); >> if (!new_page) >> goto out; >> pmd_val(*pm_dir) = __pa(new_page) | sgt_prot; > > s390 has two call sites that need to be converted, like you did in one of > your previous patches. The same seems to be true for powerpc, unless there > is a reason to not convert them? >
vmemmap_list_alloc is not really struct page allocation right ? We are just allocating memory to be used as vmemmmap_backing. But considering we are updating all the three elements of the sturct, we can avoid that memset . But instead of VMEMMAP_ZERO we can just pass false in that case ? -aneesh
