Messages in this thread Patch in this message |  | | From | Xavier <> | | Subject | [PATCH v1] mm/contpte: Optimize loop to reduce redundant operations | | Date | Mon, 7 Apr 2025 17:22:43 +0800 |
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This commit optimizes the contpte_ptep_get function by adding early termination logic. It checks if the dirty and young bits of orig_pte are already set and skips redundant bit-setting operations during the loop. This reduces unnecessary iterations and improves performance.
Signed-off-by: Xavier <xavier_qy@163.com> --- arch/arm64/mm/contpte.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/mm/contpte.c b/arch/arm64/mm/contpte.c index bcac4f55f9c1..ca15d8f52d14 100644 --- a/arch/arm64/mm/contpte.c +++ b/arch/arm64/mm/contpte.c @@ -163,17 +163,26 @@ pte_t contpte_ptep_get(pte_t *ptep, pte_t orig_pte) pte_t pte; int i; + bool dirty = false; + bool young = false; ptep = contpte_align_down(ptep); for (i = 0; i < CONT_PTES; i++, ptep++) { pte = __ptep_get(ptep); - if (pte_dirty(pte)) + if (!dirty && pte_dirty(pte)) { + dirty = true; orig_pte = pte_mkdirty(orig_pte); + } - if (pte_young(pte)) + if (!young && pte_young(pte)) { + young = true; orig_pte = pte_mkyoung(orig_pte); + } + + if (dirty && young) + break; } return orig_pte; -- 2.34.1
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