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authorKoen Kooi <koen@openembedded.org>2009-09-04 11:41:31 +0200
committerKoen Kooi <koen@openembedded.org>2009-09-04 11:41:31 +0200
commit00705178d3fae14a7cf2e2bb817745ad9b41b8b7 (patch)
treebdf5573ef9b9bfc1da5d08f7048b161360b77844 /recipes/linux/linux-omap-2.6.31/cache/copy-page-tweak.patch
parentc26fc5db90702b035bd545cff3ee7575a0f9b70f (diff)
linux-omap git: add dss2 and cache patches
Diffstat (limited to 'recipes/linux/linux-omap-2.6.31/cache/copy-page-tweak.patch')
-rw-r--r--recipes/linux/linux-omap-2.6.31/cache/copy-page-tweak.patch169
1 files changed, 169 insertions, 0 deletions
diff --git a/recipes/linux/linux-omap-2.6.31/cache/copy-page-tweak.patch b/recipes/linux/linux-omap-2.6.31/cache/copy-page-tweak.patch
new file mode 100644
index 0000000000..9da374041c
--- /dev/null
+++ b/recipes/linux/linux-omap-2.6.31/cache/copy-page-tweak.patch
@@ -0,0 +1,169 @@
+Path: news.gmane.org!not-for-mail
+From: "Kirill A. Shutemov" <kirill@shutemov.name>
+Newsgroups: gmane.linux.ports.arm.kernel
+Subject: [PATCH] ARM: copy_page.S: take into account the size of the cache line
+Date: Wed, 2 Sep 2009 20:19:58 +0300
+Lines: 92
+Approved: news@gmane.org
+Message-ID: <1251911998-3112-1-git-send-email-kirill__11898.5180197798$1251901300$gmane$org@shutemov.name>
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+NNTP-Posting-Date: Wed, 2 Sep 2009 14:21:40 +0000 (UTC)
+Cc: Bityutskiy Artem <Artem.Bityutskiy@nokia.com>,
+ "Kirill A. Shutemov" <kirill@shutemov.name>,
+ Siarhei Siamashka <siarhei.siamashka@nokia.com>,
+ Moiseichuk Leonid <leonid.moiseichuk@nokia.com>,
+ Koskinen Aaro <aaro.koskinen@nokia.com>
+To: linux-arm-kernel@lists.infradead.org,
+ linux-kernel@vger.kernel.org
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+Archived-At: <http://permalink.gmane.org/gmane.linux.ports.arm.kernel/65025>
+
+Optimized version of copy_page() was written with assumption that cache
+line size is 32 bytes. On Cortex-A8 cache line size is 64 bytes.
+
+This patch tries to generalize copy_page() to work with any cache line
+size if cache line size is multiple of 16 and page size is multiple of
+two cache line size.
+
+After this optimization we've got ~25% speedup on OMAP3(tested in
+userspace).
+
+There is test for kernelspace which trigger copy-on-write after fork():
+
+ #include <stdlib.h>
+ #include <string.h>
+ #include <unistd.h>
+
+ #define BUF_SIZE (10000*4096)
+ #define NFORK 200
+
+ int main(int argc, char **argv)
+ {
+ char *buf = malloc(BUF_SIZE);
+ int i;
+
+ memset(buf, 0, BUF_SIZE);
+
+ for(i = 0; i < NFORK; i++) {
+ if (fork()) {
+ wait(NULL);
+ } else {
+ int j;
+
+ for(j = 0; j < BUF_SIZE; j+= 4096)
+ buf[j] = (j & 0xFF) + 1;
+ break;
+ }
+ }
+
+ free(buf);
+ return 0;
+ }
+
+Before optimization this test takes ~66 seconds, after optimization
+takes ~56 seconds.
+
+Signed-off-by: Siarhei Siamashka <siarhei.siamashka@nokia.com>
+Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
+---
+ arch/arm/lib/copy_page.S | 16 ++++++++--------
+ 1 files changed, 8 insertions(+), 8 deletions(-)
+
+diff --git a/arch/arm/lib/copy_page.S b/arch/arm/lib/copy_page.S
+index 6ae04db..6ee2f67 100644
+--- a/arch/arm/lib/copy_page.S
++++ b/arch/arm/lib/copy_page.S
+@@ -12,8 +12,9 @@
+ #include <linux/linkage.h>
+ #include <asm/assembler.h>
+ #include <asm/asm-offsets.h>
++#include <asm/cache.h>
+
+-#define COPY_COUNT (PAGE_SZ/64 PLD( -1 ))
++#define COPY_COUNT (PAGE_SZ / (2 * L1_CACHE_BYTES) PLD( -1 ))
+
+ .text
+ .align 5
+@@ -26,17 +27,16 @@
+ ENTRY(copy_page)
+ stmfd sp!, {r4, lr} @ 2
+ PLD( pld [r1, #0] )
+- PLD( pld [r1, #32] )
++ PLD( pld [r1, #L1_CACHE_BYTES] )
+ mov r2, #COPY_COUNT @ 1
+ ldmia r1!, {r3, r4, ip, lr} @ 4+1
+-1: PLD( pld [r1, #64] )
+- PLD( pld [r1, #96] )
+-2: stmia r0!, {r3, r4, ip, lr} @ 4
+- ldmia r1!, {r3, r4, ip, lr} @ 4+1
+- stmia r0!, {r3, r4, ip, lr} @ 4
+- ldmia r1!, {r3, r4, ip, lr} @ 4+1
++1: PLD( pld [r1, #2 * L1_CACHE_BYTES])
++ PLD( pld [r1, #3 * L1_CACHE_BYTES])
++2:
++ .rept (2 * L1_CACHE_BYTES / 16 - 1)
+ stmia r0!, {r3, r4, ip, lr} @ 4
+ ldmia r1!, {r3, r4, ip, lr} @ 4
++ .endr
+ subs r2, r2, #1 @ 1
+ stmia r0!, {r3, r4, ip, lr} @ 4
+ ldmgtia r1!, {r3, r4, ip, lr} @ 4
+--
+1.6.4.2