7:50 a.m.
We weren't using cs_base in the hash calculations before. Since the
arm front end moved a chunk of flags in a378206a20 (target/arm: Move
mode specific TB flags to tb->cs_base) they comprise of an important
part of the execution state.
Widen the tb_hash_func to include cs_base and expand to qemu_xxhash8()
to accommodate it.
My initial benchmark shows very little difference in the
runtime.
Before:
armhf
➜ hyperfine -w 2 -m 20 "./arm-softmmu/qemu-system-arm -cpu cortex-a15 -machine
type=virt,highmem=off -display none -m 2048 -serial mon:stdio -netdev
user,id=unet,hostfwd=tcp::2222-:22 -device virtio-net-pci,netdev=unet -device
virtio-scsi-pci -blockdev
driver=raw,node-name=hd,discard=unmap,file.driver=host_device,file.filename=/dev/zen-disk/debian-bullseye-armhf
-device scsi-hd,drive=hd -smp 4 -kernel
/home/alex/lsrc/linux.git/builds/arm/arch/arm/boot/zImage -append 'console=ttyAMA0
root=/dev/sda2 systemd.unit=benchmark.service' -snapshot"
Benchmark 1: ./arm-softmmu/qemu-system-arm -cpu cortex-a15 -machine type=virt,highmem=off
-display none -m 2048 -serial mon:stdio -netdev user,id=unet,hostfwd=tcp::2222-:22 -device
virtio-net-pci,netdev=unet -device virtio-scsi-pci -blockdev
driver=raw,node-name=hd,discard=unmap,file.driver=host_device,file.filename=/dev/zen-disk/debian-bullseye-armhf
-device scsi-hd,drive=hd -smp 4 -kernel
/home/alex/lsrc/linux.git/builds/arm/arch/arm/boot/zImage -append 'console=ttyAMA0
root=/dev/sda2 systemd.unit=benchmark.service' -snapshot
Time (mean ± σ): 24.627 s ± 2.708 s [User: 34.309 s, System: 1.797 s]
Range (min … max): 22.345 s … 29.864 s 20 runs
arm64
➜ hyperfine -w 2 -n 20 "./qemu-system-aarch64 -cpu max,pauth-impdef=on -machine
type=virt,virtualization=on,gic-version=3 -display none -serial mon:stdio -netdev
user,id=unet,hostfwd=tcp::2222-:22,hostfwd=tcp::1234-:1234 -device
virtio-net-pci,netdev=unet -device virtio-scsi-pci -blockdev
driver=raw,node-name=hd,discard=unmap,file.driver=host_device,file.filename=/dev/zen-disk/debian-bullseye-arm64
-device scsi-hd,drive=hd -smp 4 -kernel
~/lsrc/linux.git/builds/arm64/arch/arm64/boot/Image.gz -append 'console=ttyAMA0
root=/dev/sda2 systemd.unit=benchmark-pigz.service' -snapshot"
Benchmark 1: 20
Time (mean ± σ): 62.559 s ± 2.917 s [User: 189.115 s, System: 4.089 s]
Range (min … max): 59.997 s … 70.153 s 10 runs
After:
armhf
Benchmark 1: ./arm-softmmu/qemu-system-arm -cpu cortex-a15 -machine type=virt,highmem=off
-display none -m 2048 -serial mon:stdio -netdev user,id=unet,hostfwd=tcp::2222-:22 -device
virtio-net-pci,netdev=unet -device virtio-scsi-pci -blockdev
driver=raw,node-name=hd,discard=unmap,file.driver=host_device,file.filename=/dev/zen-disk/debian-bullseye-armhf
-device scsi-hd,drive=hd -smp 4 -kernel
/home/alex/lsrc/linux.git/builds/arm/arch/arm/boot/zImage -append 'console=ttyAMA0
root=/dev/sda2 systemd.unit=benchmark.service' -snapshot
Time (mean ± σ): 24.223 s ± 2.151 s [User: 34.284 s, System: 1.906 s]
Range (min … max): 22.000 s … 28.476 s 20 runs
arm64
hyperfine -w 2 -n 20 "./qemu-system-aarch64 -cpu max,pauth-impdef=on -machine
type=virt,virtualization=on,gic-version=3 -display none -serial mon:stdio -netdev
user,id=unet,hostfwd=tcp::2222-:22,hostfwd=tcp::1234-:1234 -device
virtio-net-pci,netdev=unet -device virtio-scsi-pci -blockdev
driver=raw,node-name=hd,discard=unmap,file.driver=host_device,file.filename=/dev/zen-disk/debian-bullseye-arm64
-device scsi-hd,drive=hd -smp 4 -kernel
~/lsrc/linux.git/builds/arm64/arch/arm64/boot/Image.gz -append 'console=ttyAMA0
root=/dev/sda2 systemd.unit=benchmark-pigz.service' -snapshot"
Benchmark 1: 20
Time (mean ± σ): 62.769 s ± 1.978 s [User: 188.431 s, System: 5.269 s]
Range (min … max): 60.285 s … 66.868 s 10 runs
Signed-off-by: Alex Bennée <alex.bennee(a)linaro.org>
---
v4
- use an additional 64 bit argument, shuffle qsp usage
---
accel/tcg/tb-hash.h | 4 ++--
include/qemu/xxhash.h | 23 +++++++++++++++++------
accel/tcg/cpu-exec.c | 2 +-
accel/tcg/tb-maint.c | 4 ++--
util/qsp.c | 2 +-
5 files changed, 23 insertions(+), 12 deletions(-)
diff --git a/accel/tcg/tb-hash.h b/accel/tcg/tb-hash.h
index 1d19c69caa..2ba2193731 100644
--- a/accel/tcg/tb-hash.h
+++ b/accel/tcg/tb-hash.h
@@ -62,9 +62,9 @@ static inline unsigned int tb_jmp_cache_hash_func(target_ulong pc)
static inline
uint32_t tb_hash_func(tb_page_addr_t phys_pc, target_ulong pc,
- uint32_t flags, uint32_t cf_mask)
+ uint32_t flags, uint64_t flags2, uint32_t cf_mask)
{
- return qemu_xxhash6(phys_pc, pc, flags, cf_mask);
+ return qemu_xxhash8(phys_pc, pc, flags2, flags, cf_mask);
}
#endif
diff --git a/include/qemu/xxhash.h b/include/qemu/xxhash.h
index c2dcccadbf..8a5ad1f1f3 100644
--- a/include/qemu/xxhash.h
+++ b/include/qemu/xxhash.h
@@ -48,8 +48,8 @@
* xxhash32, customized for input variables that are not guaranteed to be
* contiguous in memory.
*/
-static inline uint32_t
-qemu_xxhash7(uint64_t ab, uint64_t cd, uint32_t e, uint32_t f, uint32_t g)
+static inline uint32_t qemu_xxhash8(uint64_t ab, uint64_t cd, uint64_t ef,
+ uint32_t g, uint32_t h)
{
uint32_t v1 = QEMU_XXHASH_SEED + PRIME32_1 + PRIME32_2;
uint32_t v2 = QEMU_XXHASH_SEED + PRIME32_2;
@@ -59,6 +59,8 @@ qemu_xxhash7(uint64_t ab, uint64_t cd, uint32_t e, uint32_t f, uint32_t
g)
uint32_t b = ab >> 32;
uint32_t c = cd;
uint32_t d = cd >> 32;
+ uint32_t e = ef;
+ uint32_t f = ef >> 32;
uint32_t h32;
v1 += a * PRIME32_2;
@@ -89,6 +91,9 @@ qemu_xxhash7(uint64_t ab, uint64_t cd, uint32_t e, uint32_t f, uint32_t
g)
h32 += g * PRIME32_3;
h32 = rol32(h32, 17) * PRIME32_4;
+ h32 += h * PRIME32_3;
+ h32 = rol32(h32, 17) * PRIME32_4;
+
h32 ^= h32 >> 15;
h32 *= PRIME32_2;
h32 ^= h32 >> 13;
@@ -100,23 +105,29 @@ qemu_xxhash7(uint64_t ab, uint64_t cd, uint32_t e, uint32_t f,
uint32_t g)
static inline uint32_t qemu_xxhash2(uint64_t ab)
{
- return qemu_xxhash7(ab, 0, 0, 0, 0);
+ return qemu_xxhash8(ab, 0, 0, 0, 0);
}
static inline uint32_t qemu_xxhash4(uint64_t ab, uint64_t cd)
{
- return qemu_xxhash7(ab, cd, 0, 0, 0);
+ return qemu_xxhash8(ab, cd, 0, 0, 0);
}
static inline uint32_t qemu_xxhash5(uint64_t ab, uint64_t cd, uint32_t e)
{
- return qemu_xxhash7(ab, cd, e, 0, 0);
+ return qemu_xxhash8(ab, cd, e, 0, 0);
}
static inline uint32_t qemu_xxhash6(uint64_t ab, uint64_t cd, uint32_t e,
uint32_t f)
{
- return qemu_xxhash7(ab, cd, e, f, 0);
+ return qemu_xxhash8(ab, cd, e, f, 0);
+}
+
+static inline uint32_t qemu_xxhash7(uint64_t ab, uint64_t cd, uint64_t ef,
+ uint32_t g)
+{
+ return qemu_xxhash8(ab, cd, ef, g, 0);
}
/*
diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c
index 973da2a434..8d67198e56 100644
--- a/accel/tcg/cpu-exec.c
+++ b/accel/tcg/cpu-exec.c
@@ -233,7 +233,7 @@ static TranslationBlock *tb_htable_lookup(CPUState *cpu, target_ulong
pc,
}
desc.page_addr0 = phys_pc;
h = tb_hash_func(phys_pc, (cflags & CF_PCREL ? 0 : pc),
- flags, cflags);
+ flags, cs_base, cflags);
return qht_lookup_custom(&tb_ctx.htable, &desc, h, tb_lookup_cmp);
}
diff --git a/accel/tcg/tb-maint.c b/accel/tcg/tb-maint.c
index bc1961ea55..892eecda2d 100644
--- a/accel/tcg/tb-maint.c
+++ b/accel/tcg/tb-maint.c
@@ -887,7 +887,7 @@ static void do_tb_phys_invalidate(TranslationBlock *tb, bool
rm_from_page_list)
/* remove the TB from the hash list */
phys_pc = tb_page_addr0(tb);
h = tb_hash_func(phys_pc, (orig_cflags & CF_PCREL ? 0 : tb->pc),
- tb->flags, orig_cflags);
+ tb->flags, tb->cs_base, orig_cflags);
if (!qht_remove(&tb_ctx.htable, tb, h)) {
return;
}
@@ -968,7 +968,7 @@ TranslationBlock *tb_link_page(TranslationBlock *tb, tb_page_addr_t
phys_pc,
/* add in the hash table */
h = tb_hash_func(phys_pc, (tb->cflags & CF_PCREL ? 0 : tb->pc),
- tb->flags, tb->cflags);
+ tb->flags, tb->cs_base, tb->cflags);
qht_insert(&tb_ctx.htable, tb, h, &existing_tb);
/* remove TB from the page(s) if we couldn't insert it */
diff --git a/util/qsp.c b/util/qsp.c
index 8562b14a87..2fe3764906 100644
--- a/util/qsp.c
+++ b/util/qsp.c
@@ -144,7 +144,7 @@ uint32_t do_qsp_callsite_hash(const QSPCallSite *callsite, uint64_t
ab)
uint32_t e = callsite->line;
uint32_t f = callsite->type;
- return qemu_xxhash6(ab, cd, e, f);
+ return qemu_xxhash8(ab, cd, 0, e, f);
}
static inline
--
2.39.2