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memory tiering: introduce folio_use_access_time() check

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If memory tiering mode is on and a folio is not in the top tier memory,
folio's cpupid field is repurposed to store page access time.  Instead of
an open coded check, use a function to encapsulate the check.

Link: https://lkml.kernel.org/r/20240724130115.793641-3-ziy@nvidia.com
Signed-off-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: "Huang, Ying" <ying.huang@intel.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Zi Yan
2024-07-24 09:01:14 -04:00
committed by Andrew Morton
parent 3eb2091c65
commit 2a28713a67
6 changed files with 30 additions and 10 deletions
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6
include/linux/mm.h
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@@ -1745,6 +1745,8 @@ static inline void vma_set_access_pid_bit(struct vm_area_struct *vma)
__set_bit(pid_bit, &vma->numab_state->pids_active[1]);
}
}
bool folio_use_access_time(struct folio *folio);
#else /* !CONFIG_NUMA_BALANCING */
static inline int folio_xchg_last_cpupid(struct folio *folio, int cpupid)
{
@@ -1798,6 +1800,10 @@ static inline bool cpupid_match_pid(struct task_struct *task, int cpupid)
static inline void vma_set_access_pid_bit(struct vm_area_struct *vma)
{
}
static inline bool folio_use_access_time(struct folio *folio)
{
return false;
}
#endif /* CONFIG_NUMA_BALANCING */
#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)