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Re: [PATCH v3 0/8] GICv3 LPI and ITS feature implementation
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From: |
Alex Bennée |
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Subject: |
Re: [PATCH v3 0/8] GICv3 LPI and ITS feature implementation |
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Date: |
Tue, 25 May 2021 19:26:09 +0100 |
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User-agent: |
mu4e 1.5.13; emacs 28.0.50 |
Shashi Mallela <shashi.mallela@linaro.org> writes:
> This patchset implements qemu device model for enabling physical
> LPI support and ITS functionality in GIC as per GICv3 specification.
> Both flat table and 2 level tables are implemented.The ITS commands
> for adding/deleting ITS table entries,trigerring LPI interrupts are
> implemented.Translated LPI interrupt ids are processed by redistributor
> to determine priority and set pending state appropriately before
> forwarding the same to cpu interface.
> The ITS feature support has been added to sbsa-ref platform as well as
> virt platform,wherein the emulated functionality co-exists with kvm
> kernel functionality.
So I'm definitely seeing a slow down in one of my testcases but it
doesn't seem to be HW access related. Via:
./qemu-system-aarch64 -cpu max,pauth-impdef=on -machine
type=virt,virtualization=on,gic-version=3 -display none -serial mon:stdio
-kernel ~/lsrc/linux.git/builds/arm64.initramfs/arch/arm64/boot/Image -append
"console=ttyAMA0" -m 4096 -smp 1 -plugin
contrib/plugins/libhwprofile.so,arg=source -d plugin -D before.log
pl011 @ 0xffffffc017043000
pc:ffffffc0103502cc, 1, 4, 0, 0
pc:ffffffc010350308, 1, 4, 0, 0
pc:ffffffc0103a3c14, 1, 11620, 0, 0
pc:ffffffc0103a3c4c, 0, 0, 1, 11688
gicv3_dist @ 0xffffffc018030000
pc:ffffffc01030c258, 1, 2, 0, 0
pc:ffffffc01030c31c, 0, 0, 1, 14
pc:ffffffc01030c348, 0, 0, 1, 56
pc:ffffffc01030c370, 0, 0, 1, 7
pc:ffffffc01030c37c, 0, 0, 1, 7
pc:ffffffc01030cba8, 1, 2, 0, 0
pc:ffffffc01030cc38, 0, 0, 1, 6
pc:ffffffc01030cf3c, 1, 1, 0, 0
pc:ffffffc01030d2b8, 1, 8, 0, 0
pc:ffffffc01030d6e4, 0, 0, 1, 2
pc:ffffffc01086b01c, 1, 1, 0, 0
pc:ffffffc01086b1e0, 1, 1, 0, 0
pc:ffffffc01086b1ec, 1, 1, 0, 0
pc:ffffffc01086b258, 1, 1, 0, 0
pc:ffffffc01086b39c, 0, 0, 1, 1
pc:ffffffc01086b3d4, 0, 0, 1, 7
pc:ffffffc01086b4d4, 0, 0, 1, 1
pc:ffffffc01086b51c, 0, 0, 1, 224
pcie-mmcfg-mmio @ 0xffffffc030000000
pc:ffffffc01031de00, 1, 65, 0, 0
pc:ffffffc01031de1c, 1, 105, 0, 0
pc:ffffffc01031de3c, 1, 77, 0, 0
pc:ffffffc01031de9c, 0, 0, 1, 2
pc:ffffffc01031deb0, 0, 0, 1, 8
pc:ffffffc01031debc, 0, 0, 1, 31
virtio-pci-common-virtio-net @ 0xffffffc0202d5000
pc:ffffffc01035d348, 1, 9, 0, 0
pc:ffffffc01035d368, 1, 12, 0, 0
pc:ffffffc01035d388, 1, 2, 0, 0
pc:ffffffc01035d3bc, 0, 0, 1, 1
pc:ffffffc01035d3dc, 0, 0, 1, 1
pc:ffffffc01035d54c, 0, 0, 1, 1
pc:ffffffc01035d560, 0, 0, 1, 1
pc:ffffffc01035d574, 0, 0, 1, 1
pc:ffffffc01035d588, 0, 0, 1, 1
pc:ffffffc01035d5bc, 0, 0, 1, 4
pc:ffffffc01035d780, 0, 0, 1, 3
pc:ffffffc01035d790, 0, 0, 1, 3
pc:ffffffc01035d7d0, 0, 0, 1, 1
pc:ffffffc01035db18, 0, 0, 1, 3
pc:ffffffc01035dbc0, 0, 0, 1, 3
pc:ffffffc01035dbd4, 0, 0, 1, 3
pc:ffffffc01035dbe4, 0, 0, 1, 3
pc:ffffffc01035dbf8, 0, 0, 1, 3
pc:ffffffc01035dc08, 0, 0, 1, 3
pc:ffffffc01035dc1c, 0, 0, 1, 3
pc:ffffffc01035dc2c, 0, 0, 1, 3
gicv3_redist_region[0] @ 0xffffffc018f60000
pc:ffffffc01030c258, 1, 10, 0, 0
pc:ffffffc01030c3cc, 0, 0, 1, 1
pc:ffffffc01030c3d8, 0, 0, 1, 1
pc:ffffffc01030c410, 0, 0, 1, 8
pc:ffffffc01030c428, 0, 0, 1, 1
pc:ffffffc01030c8f4, 1, 4, 0, 0
pc:ffffffc01030cc38, 0, 0, 1, 5
pc:ffffffc01030d164, 1, 2, 0, 0
pc:ffffffc01030d2b8, 1, 6, 0, 0
pc:ffffffc01030d360, 1, 1, 0, 0
pc:ffffffc01030d374, 0, 0, 1, 1
pc:ffffffc01030d388, 1, 1, 0, 0
pc:ffffffc01030e0c8, 0, 0, 1, 1
virtio-pci-notify-virtio-net @ 0xffffffc0202e2000
pc:ffffffc01035e554, 0, 0, 1, 29
But with your series applied the serial output is still the biggest hit:
pl011 @ 0xffffffc017043000
pc:ffffffc0103502cc, 1, 4, 0, 0
pc:ffffffc010350308, 1, 4, 0, 0
pc:ffffffc0103a3c14, 1, 11899, 0, 0
pc:ffffffc0103a3c4c, 0, 0, 1, 11938
gicv3_dist @ 0xffffffc018030000
pc:ffffffc01030c258, 1, 1, 0, 0
pc:ffffffc01030c31c, 0, 0, 1, 14
pc:ffffffc01030c348, 0, 0, 1, 56
pc:ffffffc01030c370, 0, 0, 1, 7
pc:ffffffc01030c37c, 0, 0, 1, 7
pc:ffffffc01030cba8, 1, 1, 0, 0
pc:ffffffc01030cc38, 0, 0, 1, 3
pc:ffffffc01030cf3c, 1, 4, 0, 0
pc:ffffffc01030d2b8, 1, 5, 0, 0
pc:ffffffc01030d6e4, 0, 0, 1, 1
pc:ffffffc01086b01c, 1, 1, 0, 0
pc:ffffffc01086b1e0, 1, 1, 0, 0
pc:ffffffc01086b1ec, 1, 1, 0, 0
pc:ffffffc01086b258, 1, 1, 0, 0
pc:ffffffc01086b39c, 0, 0, 1, 1
pc:ffffffc01086b3d4, 0, 0, 1, 7
pc:ffffffc01086b4d4, 0, 0, 1, 1
pc:ffffffc01086b51c, 0, 0, 1, 224
pcie-mmcfg-mmio @ 0xffffffc030000000
pc:ffffffc01031de00, 1, 65, 0, 0
pc:ffffffc01031de1c, 1, 122, 0, 0
pc:ffffffc01031de3c, 1, 79, 0, 0
pc:ffffffc01031de9c, 0, 0, 1, 2
pc:ffffffc01031deb0, 0, 0, 1, 13
pc:ffffffc01031debc, 0, 0, 1, 32
control @ 0xffffffc020050000
pc:ffffffc01030e6c4, 1, 21, 0, 0
pc:ffffffc01030eb00, 0, 0, 1, 5
pc:ffffffc01030ec94, 1, 1, 0, 0
pc:ffffffc01030eec8, 1, 16, 0, 0
pc:ffffffc01030ef6c, 1, 9, 0, 0
pc:ffffffc010310cb8, 1, 9, 0, 0
pc:ffffffc010310cc8, 0, 0, 1, 9
pc:ffffffc01086ba88, 1, 1, 0, 0
pc:ffffffc01086bd10, 1, 1, 0, 0
pc:ffffffc01086c1cc, 0, 0, 1, 1
pc:ffffffc01086c22c, 0, 0, 1, 1
pc:ffffffc01086c230, 1, 1, 0, 0
pc:ffffffc01086c248, 0, 0, 1, 1
virtio-pci-common-virtio-net @ 0xffffffc0202d5000
pc:ffffffc01035d348, 1, 9, 0, 0
pc:ffffffc01035d368, 1, 15, 0, 0
pc:ffffffc01035d388, 1, 2, 0, 0
pc:ffffffc01035d3bc, 0, 0, 1, 1
pc:ffffffc01035d3dc, 0, 0, 1, 1
pc:ffffffc01035d464, 0, 0, 1, 1
pc:ffffffc01035d54c, 0, 0, 1, 1
pc:ffffffc01035d560, 0, 0, 1, 1
pc:ffffffc01035d574, 0, 0, 1, 1
pc:ffffffc01035d588, 0, 0, 1, 1
pc:ffffffc01035d5bc, 0, 0, 1, 4
pc:ffffffc01035d780, 0, 0, 1, 3
pc:ffffffc01035d790, 0, 0, 1, 3
pc:ffffffc01035d7d0, 0, 0, 1, 1
pc:ffffffc01035db18, 0, 0, 1, 3
pc:ffffffc01035dbc0, 0, 0, 1, 3
pc:ffffffc01035dbd4, 0, 0, 1, 3
pc:ffffffc01035dbe4, 0, 0, 1, 3
pc:ffffffc01035dbf8, 0, 0, 1, 3
pc:ffffffc01035dc08, 0, 0, 1, 3
pc:ffffffc01035dc1c, 0, 0, 1, 3
pc:ffffffc01035dc2c, 0, 0, 1, 3
pc:ffffffc01035dcc4, 0, 0, 1, 2
gicv3_redist_region[0] @ 0xffffffc018f60000
pc:ffffffc01030c258, 1, 10, 0, 0
pc:ffffffc01030c3cc, 0, 0, 1, 1
pc:ffffffc01030c3d8, 0, 0, 1, 1
pc:ffffffc01030c410, 0, 0, 1, 8
pc:ffffffc01030c428, 0, 0, 1, 1
pc:ffffffc01030c8f4, 1, 4, 0, 0
pc:ffffffc01030cc38, 0, 0, 1, 5
pc:ffffffc01030d164, 1, 2, 0, 0
pc:ffffffc01030d2b8, 1, 6, 0, 0
pc:ffffffc01030d360, 1, 1, 0, 0
pc:ffffffc01030d374, 0, 0, 1, 1
pc:ffffffc01030d388, 1, 1, 0, 0
pc:ffffffc01030e0c8, 0, 0, 1, 1
pc:ffffffc01030e6c4, 1, 4, 0, 0
pc:ffffffc0103131dc, 1, 1, 0, 0
pc:ffffffc0103132b8, 1, 1, 0, 0
pc:ffffffc01031339c, 0, 0, 1, 1
pc:ffffffc010313410, 0, 0, 1, 1
pc:ffffffc01031342c, 1, 1, 0, 0
pc:ffffffc010313434, 0, 0, 1, 1
pc:ffffffc01086c3c4, 1, 1, 0, 0
So I ran with the hotblocks plugin:
./qemu-system-aarch64 -cpu max,pauth-impdef=on -machine
type=virt,virtualization=on,gic-version=3 -display none -serial mon:stdio
-kernel ~/lsrc/linux.git/builds/arm64.initramfs/arch/arm64/boot/Image -append
"console=ttyAMA0" -m 4096 -smp 1 -plugin contrib/plugins/libhotblocks.so -d
plugin -D hotblocks.log
collected 130606 entries in the hash table
pc, tcount, icount, ecount
0xffffffc010627fd0, 4, 10, 3998721 - memcpy
0xffffffc010628288, 2, 6, 3984790 - memset
0xffffffc01062832c, 3, 4, 1812870 - memset
0xffffffc0100a8df8, 4, 4, 1743432 - __my_cpu_offset
0xffffffc01015c394, 2, 4, 1304617 - __my_cpu_offset
0xffffffc010093348, 3, 3, 1228845 - decay_load
0xffffffc010093354, 3, 3, 1228447 - decay_load
0xffffffc01009338c, 3, 2, 1228447 - decay_load
0xffffffc01009336c, 3, 7, 1180051 - decay_load
0xffffffc010631300, 3, 4, 1114347 - __radix_tree_lookup
0xffffffc0106312c8, 3, 12, 1114337 - __radix_tree_lookup
0xffffffc0106312f8, 3, 2, 1114337 -
0xffffffc010132aec, 3, 4, 1080983
0xffffffc010132afc, 3, 12, 1080983
0xffffffc010132b30, 3, 2, 1080983
0x000000004084b58c, 1, 1, 1052116
0x000000004084b590, 1, 7, 1052116
0x000000004084b57c, 1, 4, 1051127
0xffffffc01001a118, 2, 6, 1049119
0xffffffc01001a944, 2, 2, 1048689
So whatever is holding it up is because it's heavily spamming core
functions.
--
Alex Bennée