From 6394f0e8abe7ca3132faa1321c97c53d0994aecc Mon Sep 17 00:00:00 2001 From: "Ritesh Harjani (IBM)" Date: Thu, 30 Oct 2025 20:27:33 +0530 Subject: [PATCH] powerpc/64s/pgtable: Enable directMap counters in meminfo for Hash This patch enables the directMap counters to be printed in proc/meminfo for Hash mmu. With this patch on a system with 8G of DRAM we can see the entire RAM mapped with 16M pagesize: cat /proc/meminfo |grep -i direct DirectMap4k: 0 kB DirectMap64k: 0 kB DirectMap16M: 8388608 kB DirectMap16G: 0 kB Tested with devdax too: root@buildroot:/# ndctl create-namespace -r region0 -m devdax -s 2G { "dev":"namespace0.0", "mode":"devdax", "map":"dev", "size":"2032.00 MiB (2130.71 MB)", "uuid":"aa383ded-cd99-43a0-979f-5225467cfb40", "daxregion":{ "id":0, "size":"2032.00 MiB (2130.71 MB)", "align":16777216, "devices":[ { "chardev":"dax0.0", "size":"2032.00 MiB (2130.71 MB)", "target_node":0, "align":"16.00 MiB (16.78 MB)", "mode":"devdax" } ] }, "align":16777216 } root@buildroot:/# cat /proc/meminfo |grep -i direct DirectMap4k: 0 kB DirectMap64k: 0 kB DirectMap16M: 10485760 kB DirectMap16G: 0 kB root@buildroot:/# ndctl destroy-namespace -f all destroyed 1 namespace root@buildroot:/# cat /proc/meminfo |grep -i direct DirectMap4k: 0 kB DirectMap64k: 0 kB DirectMap16M: 8388608 kB DirectMap16G: 0 kB Signed-off-by: Ritesh Harjani (IBM) Signed-off-by: Madhavan Srinivasan Link: https://patch.msgid.link/ffe47912e17075649b6ce5b2ee5d7f3eb5352e0b.1761834163.git.ritesh.list@gmail.com --- arch/powerpc/mm/book3s64/pgtable.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c index c9431ae7f78a0..e3485db7de027 100644 --- a/arch/powerpc/mm/book3s64/pgtable.c +++ b/arch/powerpc/mm/book3s64/pgtable.c @@ -510,20 +510,21 @@ atomic_long_t direct_pages_count[MMU_PAGE_COUNT]; void arch_report_meminfo(struct seq_file *m) { - /* - * Hash maps the memory with one size mmu_linear_psize. - * So don't bother to print these on hash - */ - if (!radix_enabled()) - return; seq_printf(m, "DirectMap4k: %8lu kB\n", atomic_long_read(&direct_pages_count[MMU_PAGE_4K]) << 2); - seq_printf(m, "DirectMap64k: %8lu kB\n", + seq_printf(m, "DirectMap64k: %8lu kB\n", atomic_long_read(&direct_pages_count[MMU_PAGE_64K]) << 6); - seq_printf(m, "DirectMap2M: %8lu kB\n", - atomic_long_read(&direct_pages_count[MMU_PAGE_2M]) << 11); - seq_printf(m, "DirectMap1G: %8lu kB\n", - atomic_long_read(&direct_pages_count[MMU_PAGE_1G]) << 20); + if (radix_enabled()) { + seq_printf(m, "DirectMap2M: %8lu kB\n", + atomic_long_read(&direct_pages_count[MMU_PAGE_2M]) << 11); + seq_printf(m, "DirectMap1G: %8lu kB\n", + atomic_long_read(&direct_pages_count[MMU_PAGE_1G]) << 20); + } else { + seq_printf(m, "DirectMap16M: %8lu kB\n", + atomic_long_read(&direct_pages_count[MMU_PAGE_16M]) << 14); + seq_printf(m, "DirectMap16G: %8lu kB\n", + atomic_long_read(&direct_pages_count[MMU_PAGE_16G]) << 24); + } } #endif /* CONFIG_PROC_FS */ -- 2.47.3