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Fri, 26 May 2023 09:54:08 -0700 (PDT) From: =?UTF-8?q?Alex=20Benn=C3=A9e?= To: qemu-devel@nongnu.org, Stefan Hajnoczi Subject: [PATCH v6 11/11] accel/tcg: include cs_base in our hash calculations Date: Fri, 26 May 2023 17:54:01 +0100 Message-Id: <20230526165401.574474-12-alex.bennee@linaro.org> In-Reply-To: <20230526165401.574474-1-alex.bennee@linaro.org> References: <20230526165401.574474-1-alex.bennee@linaro.org> MIME-Version: 1.0 X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 3.1 on 10.11.54.7 X-BeenThere: libvir-list@redhat.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: Development discussions about the libvirt library & tools List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Eduardo Habkost , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , =?UTF-8?q?Alex=20Benn=C3=A9e?= , libvir-list@redhat.com, Kyle Evans , Riku Voipio , Richard Henderson , Markus Armbruster , Greg Kurz , Yanan Wang , Marcel Apfelbaum , Michael Roth , Paolo Bonzini , Christian Schoenebeck , Eric Blake , Warner Losh Errors-To: libvir-list-bounces@redhat.com Sender: "libvir-list" X-Scanned-By: MIMEDefang 3.1 on 10.11.54.10 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: linaro.org Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1685120065234100001 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 =E2=9E=9C hyperfine -w 2 -m 20 "./arm-softmmu/qemu-system-arm -cpu cortex-= a15 -machine type=3Dvirt,highmem=3Doff -display none -m 2048 -serial mon:st= dio -netdev user,id=3Dunet,hostfwd=3Dtcp::2222-:22 -device virtio-net-pci,n= etdev=3Dunet -device virtio-scsi-pci -blockdev driver=3Draw,node-name=3Dhd,= discard=3Dunmap,file.driver=3Dhost_device,file.filename=3D/dev/zen-disk/deb= ian-bullseye-armhf -device scsi-hd,drive=3Dhd -smp 4 -kernel /home/alex/lsr= c/linux.git/builds/arm/arch/arm/boot/zImage -append 'console=3DttyAMA0 root= =3D/dev/sda2 systemd.unit=3Dbenchmark.service' -snapshot" Benchmark 1: ./arm-softmmu/qemu-system-arm -cpu cortex-a15 -machine type=3D= virt,highmem=3Doff -display none -m 2048 -serial mon:stdio -netdev user,id= =3Dunet,hostfwd=3Dtcp::2222-:22 -device virtio-net-pci,netdev=3Dunet -devic= e virtio-scsi-pci -blockdev driver=3Draw,node-name=3Dhd,discard=3Dunmap,fil= e.driver=3Dhost_device,file.filename=3D/dev/zen-disk/debian-bullseye-armhf = -device scsi-hd,drive=3Dhd -smp 4 -kernel /home/alex/lsrc/linux.git/builds/= arm/arch/arm/boot/zImage -append 'console=3DttyAMA0 root=3D/dev/sda2 system= d.unit=3Dbenchmark.service' -snapshot Time (mean =C2=B1 =CF=83): 24.627 s =C2=B1 2.708 s [User: 34.309 = s, System: 1.797 s] Range (min =E2=80=A6 max): 22.345 s =E2=80=A6 29.864 s 20 runs arm64 =E2=9E=9C hyperfine -w 2 -n 20 "./qemu-system-aarch64 -cpu max,pauth-impde= f=3Don -machine type=3Dvirt,virtualization=3Don,gic-version=3D3 -display no= ne -serial mon:stdio -netdev user,id=3Dunet,hostfwd=3Dtcp::2222-:22,hostfwd= =3Dtcp::1234-:1234 -device virtio-net-pci,netdev=3Dunet -device virtio-scsi= -pci -blockdev driver=3Draw,node-name=3Dhd,discard=3Dunmap,file.driver=3Dho= st_device,file.filename=3D/dev/zen-disk/debian-bullseye-arm64 -device scsi-= hd,drive=3Dhd -smp 4 -kernel ~/lsrc/linux.git/builds/arm64/arch/arm64/boot/= Image.gz -append 'console=3DttyAMA0 root=3D/dev/sda2 systemd.unit=3Dbenchma= rk-pigz.service' -snapshot" Benchmark 1: 20 Time (mean =C2=B1 =CF=83): 62.559 s =C2=B1 2.917 s [User: 189.115= s, System: 4.089 s] Range (min =E2=80=A6 max): 59.997 s =E2=80=A6 70.153 s 10 runs After: armhf Benchmark 1: ./arm-softmmu/qemu-system-arm -cpu cortex-a15 -machine type=3D= virt,highmem=3Doff -display none -m 2048 -serial mon:stdio -netdev user,id= =3Dunet,hostfwd=3Dtcp::2222-:22 -device virtio-net-pci,netdev=3Dunet -devic= e virtio-scsi-pci -blockdev driver=3Draw,node-name=3Dhd,discard=3Dunmap,fil= e.driver=3Dhost_device,file.filename=3D/dev/zen-disk/debian-bullseye-armhf = -device scsi-hd,drive=3Dhd -smp 4 -kernel /home/alex/lsrc/linux.git/builds/= arm/arch/arm/boot/zImage -append 'console=3DttyAMA0 root=3D/dev/sda2 system= d.unit=3Dbenchmark.service' -snapshot Time (mean =C2=B1 =CF=83): 24.223 s =C2=B1 2.151 s [User: 34.284 = s, System: 1.906 s] Range (min =E2=80=A6 max): 22.000 s =E2=80=A6 28.476 s 20 runs arm64 hyperfine -w 2 -n 20 "./qemu-system-aarch64 -cpu max,pauth-impdef=3Don -mac= hine type=3Dvirt,virtualization=3Don,gic-version=3D3 -display none -serial = mon:stdio -netdev user,id=3Dunet,hostfwd=3Dtcp::2222-:22,hostfwd=3Dtcp::123= 4-:1234 -device virtio-net-pci,netdev=3Dunet -device virtio-scsi-pci -block= dev driver=3Draw,node-name=3Dhd,discard=3Dunmap,file.driver=3Dhost_device,f= ile.filename=3D/dev/zen-disk/debian-bullseye-arm64 -device scsi-hd,drive=3D= hd -smp 4 -kernel ~/lsrc/linux.git/builds/arm64/arch/arm64/boot/Image.gz -a= ppend 'console=3DttyAMA0 root=3D/dev/sda2 systemd.unit=3Dbenchmark-pigz.ser= vice' -snapshot" Benchmark 1: 20 Time (mean =C2=B1 =CF=83): 62.769 s =C2=B1 1.978 s [User: 188.431= s, System: 5.269 s] Range (min =E2=80=A6 max): 60.285 s =E2=80=A6 66.868 s 10 runs Signed-off-by: Alex Benn=C3=A9e Reviewed-by: Richard Henderson Message-Id: <20230524133952.3971948-11-alex.bennee@linaro.org> --- 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) =20 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); } =20 #endif diff --git a/include/qemu/xxhash.h b/include/qemu/xxhash.h index c2dcccadbf..0259bbef18 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 =3D QEMU_XXHASH_SEED + PRIME32_1 + PRIME32_2; uint32_t v2 =3D 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 =3D ab >> 32; uint32_t c =3D cd; uint32_t d =3D cd >> 32; + uint32_t e =3D ef; + uint32_t f =3D ef >> 32; uint32_t h32; =20 v1 +=3D 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 +=3D g * PRIME32_3; h32 =3D rol32(h32, 17) * PRIME32_4; =20 + h32 +=3D h * PRIME32_3; + h32 =3D rol32(h32, 17) * PRIME32_4; + h32 ^=3D h32 >> 15; h32 *=3D PRIME32_2; h32 ^=3D h32 >> 13; @@ -100,23 +105,29 @@ qemu_xxhash7(uint64_t ab, uint64_t cd, uint32_t e, ui= nt32_t f, uint32_t g) =20 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); } =20 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); } =20 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, 0, e, 0); } =20 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, 0, e, f); +} + +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); } =20 /* diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c index 4a1dce98ff..60ca9e229e 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 =3D phys_pc; h =3D 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); } =20 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 =3D tb_page_addr0(tb); h =3D 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, =20 /* add in the hash table */ h =3D 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); =20 /* 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 *callsi= te, uint64_t ab) uint32_t e =3D callsite->line; uint32_t f =3D callsite->type; =20 - return qemu_xxhash6(ab, cd, e, f); + return qemu_xxhash8(ab, cd, 0, e, f); } =20 static inline --=20 2.39.2