From: Seth Jennings <sjenning@linux.vnet.ibm.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Seth Jennings <sjenning@linux.vnet.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Dan Magenheimer <dan.magenheimer@oracle.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Nitin Gupta <ngupta@vflare.org>, Minchan Kim <minchan@kernel.org>,
Robert Jennings <rcj@linux.vnet.ibm.com>,
linux-mm@kvack.org, devel@driverdev.osuosl.org,
linux-kernel@vger.kernel.org
Subject: [PATCH 3/3] x86: add local_tlb_flush_kernel_range()
Date: Mon, 25 Jun 2012 11:14:38 -0500 [thread overview]
Message-ID: <1340640878-27536-4-git-send-email-sjenning@linux.vnet.ibm.com> (raw)
In-Reply-To: <1340640878-27536-1-git-send-email-sjenning@linux.vnet.ibm.com>
This patch adds support for a local_tlb_flush_kernel_range()
function for the x86 arch. This function allows for CPU-local
TLB flushing, potentially using invlpg for single entry flushing,
using an arch independent function name.
Signed-off-by: Seth Jennings <sjenning@linux.vnet.ibm.com>
---
arch/x86/include/asm/tlbflush.h | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h
index 36a1a2a..92a280b 100644
--- a/arch/x86/include/asm/tlbflush.h
+++ b/arch/x86/include/asm/tlbflush.h
@@ -168,4 +168,25 @@ static inline void flush_tlb_kernel_range(unsigned long start,
flush_tlb_all();
}
+#define __HAVE_LOCAL_FLUSH_TLB_KERNEL_RANGE
+/*
+ * INVLPG_BREAK_EVEN_PAGES is the number of pages after which single tlb
+ * flushing becomes more costly than just doing a complete tlb flush.
+ * While this break even point varies among x86 hardware, tests have shown
+ * that 8 is a good generic value.
+*/
+#define INVLPG_BREAK_EVEN_PAGES 8
+static inline void local_flush_tlb_kernel_range(unsigned long start,
+ unsigned long end)
+{
+ if (cpu_has_invlpg &&
+ (end - start)/PAGE_SIZE <= INVLPG_BREAK_EVEN_PAGES) {
+ while (start < end) {
+ __flush_tlb_single(start);
+ start += PAGE_SIZE;
+ }
+ } else
+ local_flush_tlb();
+}
+
#endif /* _ASM_X86_TLBFLUSH_H */
--
1.7.9.5
next prev parent reply other threads:[~2012-06-25 16:42 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-25 16:14 [PATCH 0/3] zsmalloc: remove x86 dependency Seth Jennings
2012-06-25 16:14 ` [PATCH 1/3] zram/zcache: swtich Kconfig dependency from X86 to ZSMALLOC Seth Jennings
2012-06-27 2:37 ` Minchan Kim
2012-06-27 2:43 ` Greg Kroah-Hartman
2012-06-27 2:49 ` Minchan Kim
2012-06-27 3:21 ` Greg Kroah-Hartman
2012-06-27 15:40 ` Konrad Rzeszutek Wilk
2012-06-27 18:55 ` Greg Kroah-Hartman
2012-06-27 18:52 ` Konrad Rzeszutek Wilk
2012-06-27 19:29 ` Greg Kroah-Hartman
2012-06-25 16:14 ` [PATCH 2/3] zsmalloc: add generic path and remove x86 dependency Seth Jennings
2012-06-25 16:59 ` Greg Kroah-Hartman
2012-06-25 17:10 ` Seth Jennings
2012-06-25 17:19 ` Greg Kroah-Hartman
2012-06-25 18:24 ` Seth Jennings
2012-06-25 23:37 ` Greg Kroah-Hartman
2012-06-27 5:28 ` Minchan Kim
2012-06-27 19:09 ` Seth Jennings
2012-06-28 0:20 ` Minchan Kim
2012-06-25 16:14 ` Seth Jennings [this message]
2012-06-25 23:01 ` [PATCH 3/3] x86: add local_tlb_flush_kernel_range() Konrad Rzeszutek Wilk
2012-06-26 13:39 ` Seth Jennings
2012-06-27 5:53 ` Minchan Kim
2012-06-27 6:14 ` Alex Shi
2012-06-27 6:26 ` Minchan Kim
2012-06-27 15:12 ` Dan Magenheimer
2012-06-27 15:39 ` Konrad Rzeszutek Wilk
2012-06-27 18:35 ` Seth Jennings
2012-06-27 18:33 ` Seth Jennings
2012-06-27 21:15 ` Dan Magenheimer
2012-06-27 21:41 ` Seth Jennings
2012-06-28 2:03 ` Alex Shi
2012-06-28 15:21 ` Seth Jennings
2012-06-29 0:19 ` Alex Shi
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