The patch titled
kprobes: increase kprobe_hash_table size
has been removed from the -mm tree. Its filename was
kprobe-increase-kprobe_hash_table-size.patch
This patch was dropped because it was withdrawn
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: kprobes: increase kprobe_hash_table size
From: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Increase the size of kprobe hash table to 512. It's useful when hundreds
of kprobes were used in the kernel because current size is just 64.
When probing enters and exits of syscall-related functions, we need more
than 500 probes. In that case, each hlist would have 8 elements in
average. With this patch, the hlist would have 1 element in average.
akpm: bloat alert:
text data bss dec hex filename
7036 744 9380 17160 4308 kernel/kprobes.o
7048 744 73892 81684 13f14 kernel/kprobes.o
That's 64 kbytes more memory. It is due to kretprobe_table_locks[], which
uses ____cacheline_aligned.
Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Acked-by: Ananth N Mavinakayanahalli <ananth@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/kprobes.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN kernel/kprobes.c~kprobe-increase-kprobe_hash_table-size kernel/kprobes.c
--- a/kernel/kprobes.c~kprobe-increase-kprobe_hash_table-size
+++ a/kernel/kprobes.c
@@ -49,7 +49,7 @@
#include <asm/errno.h>
#include <asm/uaccess.h>
-#define KPROBE_HASH_BITS 6
+#define KPROBE_HASH_BITS 9
#define KPROBE_TABLE_SIZE (1 << KPROBE_HASH_BITS)
_
Patches currently in -mm which might be from mhiramat@xxxxxxxxxx are
kprobes-disable-preempt-for-module_text_address-and-kernel_text_address.patch
kprobe-increase-kprobe_hash_table-size.patch
kprobes-bugfix-try_module_get-even-if-calling_mod-is-null.patch
kprobes-indirectly-call-kprobe_target.patch
kprobes-add-tests-for-register_kprobes.patch
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