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powerpc/64s/pgtable: Enable directMap counters in meminfo for Hash

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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) <ritesh.list@gmail.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/ffe47912e17075649b6ce5b2ee5d7f3eb5352e0b.1761834163.git.ritesh.list@gmail.com
This commit is contained in:
Ritesh Harjani (IBM)
2025-10-30 20:27:33 +05:30
committed by Madhavan Srinivasan
parent b296fda58d
commit 6394f0e8ab
1 changed files with 12 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
arch/powerpc/mm/book3s64/pgtable.c
View File

@@ -510,20 +510,21 @@ atomic_long_t direct_pages_count[MMU_PAGE_COUNT];
void arch_report_meminfo(struct seq_file *m) 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", seq_printf(m, "DirectMap4k: %8lu kB\n",
atomic_long_read(&direct_pages_count[MMU_PAGE_4K]) << 2); 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); atomic_long_read(&direct_pages_count[MMU_PAGE_64K]) << 6);
seq_printf(m, "DirectMap2M: %8lu kB\n", if (radix_enabled()) {
atomic_long_read(&direct_pages_count[MMU_PAGE_2M]) << 11); seq_printf(m, "DirectMap2M: %8lu kB\n",
seq_printf(m, "DirectMap1G: %8lu kB\n", atomic_long_read(&direct_pages_count[MMU_PAGE_2M]) << 11);
atomic_long_read(&direct_pages_count[MMU_PAGE_1G]) << 20); 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 */ #endif /* CONFIG_PROC_FS */