From: Christophe Leroy <christophe.leroy@c-s.fr>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2] powerpc/32s: Don't flush all TLBs when flushing one page
Date: Sat, 1 Feb 2020 08:04:31 +0000 (UTC) [thread overview]
Message-ID: <b30b2eae6960502eaf0d9e36c60820b839693c33.1580542939.git.christophe.leroy@c-s.fr> (raw)
When flushing any memory range, the flushing function
flushes all TLBs.
When (start) and (end - 1) are in the same memory page,
flush that page instead.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
v2: Reworked the test as the previous one was always false (end - start was PAGE_SIZE - 1 for a single page)
---
arch/powerpc/mm/book3s32/tlb.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/mm/book3s32/tlb.c b/arch/powerpc/mm/book3s32/tlb.c
index 2fcd321040ff..724c0490fb17 100644
--- a/arch/powerpc/mm/book3s32/tlb.c
+++ b/arch/powerpc/mm/book3s32/tlb.c
@@ -79,11 +79,14 @@ static void flush_range(struct mm_struct *mm, unsigned long start,
int count;
unsigned int ctx = mm->context.id;
+ start &= PAGE_MASK;
if (!Hash) {
- _tlbia();
+ if (end - start <= PAGE_SIZE)
+ _tlbie(start);
+ else
+ _tlbia();
return;
}
- start &= PAGE_MASK;
if (start >= end)
return;
end = (end - 1) | ~PAGE_MASK;
--
2.25.0
next reply other threads:[~2020-02-01 8:06 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-01 8:04 Christophe Leroy [this message]
2020-02-01 16:27 ` [PATCH v2] powerpc/32s: Don't flush all TLBs when flushing one page Christophe Leroy
2020-03-06 0:27 ` Michael Ellerman
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