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powerpc/book3s64/mm: Fix DirectMap stats in /proc/meminfo 

On memory unplug reduce DirectMap page count correctly.
root@ubuntu-guest:# grep Direct /proc/meminfo
DirectMap4k:           0 kB
DirectMap64k:           0 kB
DirectMap2M:    115343360 kB
DirectMap1G:           0 kB

Before fix:
root@ubuntu-guest:# ndctl disable-namespace all
disabled 1 namespace
root@ubuntu-guest:# grep Direct /proc/meminfo
DirectMap4k:           0 kB
DirectMap64k:           0 kB
DirectMap2M:    115343360 kB
DirectMap1G:           0 kB

After fix:
root@ubuntu-guest:# ndctl disable-namespace all
disabled 1 namespace
root@ubuntu-guest:# grep Direct /proc/meminfo
DirectMap4k:           0 kB
DirectMap64k:           0 kB
DirectMap2M:    104857600 kB
DirectMap1G:           0 kB

Fixes: a2dc009afa ("powerpc/mm/book3s/radix: Add mapping statistics")
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Tested-by: Sachin Sant <sachinp@linux.ibm.com <mailto:sachinp@linux.ibm.com>>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230616110826.344417-4-aneesh.kumar@linux.ibm.com
This commit is contained in:
Aneesh Kumar K.V 2023-06-16 16:38:13 +05:30 committed by Michael Ellerman
parent 040ec6202b
commit 0da90af431
1 changed files with 22 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
arch/powerpc/mm/book3s64/radix_pgtable.c
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@ -745,9 +745,9 @@ static void free_pud_table(pud_t *pud_start, p4d_t *p4d)
}
static void remove_pte_table(pte_t *pte_start, unsigned long addr,
unsigned long end)
unsigned long end, bool direct)
{
unsigned long next;
unsigned long next, pages = 0;
pte_t *pte;
pte = pte_start + pte_index(addr);
@ -769,13 +769,16 @@ static void remove_pte_table(pte_t *pte_start, unsigned long addr,
}
pte_clear(&init_mm, addr, pte);
pages++;
}
if (direct)
update_page_count(mmu_virtual_psize, -pages);
}
static void __meminit remove_pmd_table(pmd_t *pmd_start, unsigned long addr,
unsigned long end)
unsigned long end, bool direct)
{
unsigned long next;
unsigned long next, pages = 0;
pte_t *pte_base;
pmd_t *pmd;
@ -793,19 +796,22 @@ static void __meminit remove_pmd_table(pmd_t *pmd_start, unsigned long addr,
continue;
}
pte_clear(&init_mm, addr, (pte_t *)pmd);
pages++;
continue;
}
pte_base = (pte_t *)pmd_page_vaddr(*pmd);
remove_pte_table(pte_base, addr, next);
remove_pte_table(pte_base, addr, next, direct);
free_pte_table(pte_base, pmd);
}
if (direct)
update_page_count(MMU_PAGE_2M, -pages);
}
static void __meminit remove_pud_table(pud_t *pud_start, unsigned long addr,
unsigned long end)
unsigned long end, bool direct)
{
unsigned long next;
unsigned long next, pages = 0;
pmd_t *pmd_base;
pud_t *pud;
@ -823,16 +829,20 @@ static void __meminit remove_pud_table(pud_t *pud_start, unsigned long addr,
continue;
}
pte_clear(&init_mm, addr, (pte_t *)pud);
pages++;
continue;
}
pmd_base = pud_pgtable(*pud);
remove_pmd_table(pmd_base, addr, next);
remove_pmd_table(pmd_base, addr, next, direct);
free_pmd_table(pmd_base, pud);
}
if (direct)
update_page_count(MMU_PAGE_1G, -pages);
}
static void __meminit remove_pagetable(unsigned long start, unsigned long end)
static void __meminit remove_pagetable(unsigned long start, unsigned long end,
bool direct)
{
unsigned long addr, next;
pud_t *pud_base;
@ -861,7 +871,7 @@ static void __meminit remove_pagetable(unsigned long start, unsigned long end)
}
pud_base = p4d_pgtable(*p4d);
remove_pud_table(pud_base, addr, next);
remove_pud_table(pud_base, addr, next, direct);
free_pud_table(pud_base, p4d);
}
@ -884,7 +894,7 @@ int __meminit radix__create_section_mapping(unsigned long start,
int __meminit radix__remove_section_mapping(unsigned long start, unsigned long end)
{
remove_pagetable(start, end);
remove_pagetable(start, end, true);
return 0;
}
#endif /* CONFIG_MEMORY_HOTPLUG */
@ -920,7 +930,7 @@ int __meminit radix__vmemmap_create_mapping(unsigned long start,
#ifdef CONFIG_MEMORY_HOTPLUG
void __meminit radix__vmemmap_remove_mapping(unsigned long start, unsigned long page_size)
{
remove_pagetable(start, start + page_size);
remove_pagetable(start, start + page_size, false);
}
#endif
#endif