Re: [Qemu-devel] MAINTAINERS leaves too many files uncovered

[Markus Armbruster]

Markus Armbruster <address@hidden> writes:

> In my experience, too many files are not covered by MAINTAINERS.
> scripts/get_maintainer.pl falls back to git then, unless you say
> --no-git-fallback.  Copies sent there tends to annoy their recipients
> without accomplishing all that much.
>
> Two obvious improvements:
>
> * Easy: Flip scripts/get_maintainer.pl's default to --no-git-fallback.
>   I'll post the obvious patch, please raise your objections there.
>
> * Harder: improve MAINTAINERS coverage.

A few folks have started doing that.  Much appreciated!

I collected recent patches to MAINTAINERS, and reran my analysis.

> Let me back up subjective experience with hard data.  The tree has quite
> a few files:
>
>     $ git-ls-files | wc -l
>     3746

Now 3752.

> Counting them by extension:
>
>     $ git-ls-files | sed -n 's#.*/##;s#.*\.##p' | sort | uniq -c | sort -nr
>        1836 c
>         818 h
>         133 out
>         105 S
>          97 objs
>          69 s
>          64 mak
>          48 json
>          47 py
>          41 txt
>          33 exit
>          33 err
>          16 xml
>          16 bin
>          13 rom
>          12 sh
>          12 dsl
> [Long tail that doesn't add up to anything interesting omitted]
>
> Let's look for .c not in MAINTAINERS:
>
>     $ for i in `git-ls-files`; do [ "`scripts/get_maintainer.pl -f 
> --no-git-fallback $i`" ] || echo $i; done >unmaintained-files
>     $ grep -c '\.c$' unmaintained-files
>     1066
>
> That's almost 60%.  Not good.

Down to 491 our of 1841 (27%).  Progress, but not quite enough.

> Apparently, nobody cares for tests:
>
>     $ grep '^tests/' unmaintained-files | grep -c '\.c$'
>     654
>     $ git-ls-files | grep '^tests/' | grep -c '\.c$'
>     664

Now 91 out of 665.

> Filtering those out leaves us with 412 unmaintained out of of 1172, or
> 35% unmaintained.  Not good even if we (foolishly!) considered tests not
> worthy of maintenance.
>
> Maybe unmaintained files are much smaller.  David A.  Wheeler's
> SLOCCount counts 570kSLOC in 1212 maintained files (+140 files sloccount
> doesn't know how to count) vs. 300kSLOC in 1798 unmaintained files (+596
> uncounted), or 35% unmaintained SLOC.  With tests/ ignored, it's 30%.
> So, unmaintained files are indeed smaller, but 30-something percent is
> still not good.
>
> Where are the unmaintained files?  Top-scoring directories outside
> tests/ and include/, files in subdirs not counted:
>
>     #files   directory
>     84  68%  .
>     63 100%  default-configs
>     48 100%  pc-bios
>     43  97%  stubs
>     39 100%  util
>     37 100%  pc-bios/keymaps
>     35  81%  hw/display
>     32  94%  scripts
>     26  92%  docs
>     26 100%  libcacard
>     23  69%  hw/misc
>     22  57%  hw/net
>     21  63%  hw/intc
>     19 100%  roms
>     18 100%  disas
>     18  56%  hw/timer
>     16 100%  hw/core
>     15  53%  hw/char
>     15 100%  qga
>     14 100%  docs/specs
>     12  92%  hw/input
>     12 100%  qobject
>     12 100%  target-m68k
>     11 100%  backends
>     11 100%  pc-bios/s390-ccw
>     10  71%  hw/dma
>
> Ideas?  Takers?

Full list of unmaintained files now:

.exrc
.gitignore
.gitmodules
.mailmap
.travis.yml
CODING_STYLE
COPYING
COPYING.LIB
Changelog
HACKING
LICENSE
MAINTAINERS
Makefile
Makefile.objs
Makefile.target
README
VERSION
accel.c
arch_init.c
backends/Makefile.objs
backends/baum.c
backends/hostmem-file.c
backends/hostmem-ram.c
backends/hostmem.c
backends/msmouse.c
backends/rng-egd.c
backends/rng-random.c
backends/rng.c
backends/testdev.c
backends/tpm.c
balloon.c
bt-host.c
bt-vhci.c
configure
coroutine-gthread.c
coroutine-sigaltstack.c
coroutine-ucontext.c
cpus.c
default-configs/aarch64-linux-user.mak
default-configs/aarch64-softmmu.mak
default-configs/alpha-linux-user.mak
default-configs/alpha-softmmu.mak
default-configs/arm-linux-user.mak
default-configs/arm-softmmu.mak
default-configs/armeb-linux-user.mak
default-configs/cris-linux-user.mak
default-configs/cris-softmmu.mak
default-configs/i386-bsd-user.mak
default-configs/i386-linux-user.mak
default-configs/i386-softmmu.mak
default-configs/lm32-softmmu.mak
default-configs/m68k-linux-user.mak
default-configs/m68k-softmmu.mak
default-configs/microblaze-linux-user.mak
default-configs/microblaze-softmmu.mak
default-configs/microblazeel-linux-user.mak
default-configs/microblazeel-softmmu.mak
default-configs/mips-linux-user.mak
default-configs/mips-softmmu.mak
default-configs/mips64-linux-user.mak
default-configs/mips64-softmmu.mak
default-configs/mips64el-linux-user.mak
default-configs/mips64el-softmmu.mak
default-configs/mipsel-linux-user.mak
default-configs/mipsel-softmmu.mak
default-configs/mipsn32-linux-user.mak
default-configs/mipsn32el-linux-user.mak
default-configs/moxie-softmmu.mak
default-configs/or32-linux-user.mak
default-configs/or32-softmmu.mak
default-configs/pci.mak
default-configs/ppc-linux-user.mak
default-configs/ppc-softmmu.mak
default-configs/ppc64-linux-user.mak
default-configs/ppc64-softmmu.mak
default-configs/ppc64abi32-linux-user.mak
default-configs/ppc64le-linux-user.mak
default-configs/ppcemb-softmmu.mak
default-configs/s390x-linux-user.mak
default-configs/s390x-softmmu.mak
default-configs/sh4-linux-user.mak
default-configs/sh4-softmmu.mak
default-configs/sh4eb-linux-user.mak
default-configs/sh4eb-softmmu.mak
default-configs/sound.mak
default-configs/sparc-bsd-user.mak
default-configs/sparc-linux-user.mak
default-configs/sparc-softmmu.mak
default-configs/sparc32plus-linux-user.mak
default-configs/sparc64-bsd-user.mak
default-configs/sparc64-linux-user.mak
default-configs/sparc64-softmmu.mak
default-configs/tricore-softmmu.mak
default-configs/unicore32-linux-user.mak
default-configs/unicore32-softmmu.mak
default-configs/usb.mak
default-configs/x86_64-bsd-user.mak
default-configs/x86_64-linux-user.mak
default-configs/x86_64-softmmu.mak
default-configs/xtensa-softmmu.mak
default-configs/xtensaeb-softmmu.mak
device-hotplug.c
disas.c
disas/Makefile.objs
disas/alpha.c
disas/arm-a64.cc
disas/arm.c
disas/cris.c
disas/hppa.c
disas/i386.c
disas/ia64.c
disas/libvixl/LICENCE
disas/libvixl/Makefile.objs
disas/libvixl/README
disas/libvixl/a64/assembler-a64.h
disas/libvixl/a64/constants-a64.h
disas/libvixl/a64/cpu-a64.h
disas/libvixl/a64/decoder-a64.cc
disas/libvixl/a64/decoder-a64.h
disas/libvixl/a64/disasm-a64.cc
disas/libvixl/a64/disasm-a64.h
disas/libvixl/a64/instructions-a64.cc
disas/libvixl/a64/instructions-a64.h
disas/libvixl/globals.h
disas/libvixl/platform.h
disas/libvixl/utils.cc
disas/libvixl/utils.h
disas/lm32.c
disas/m68k.c
disas/microblaze.c
disas/mips.c
disas/moxie.c
disas/ppc.c
disas/s390.c
disas/sh4.c
disas/sparc.c
disas/tci.c
dma-helpers.c
docs/aio_notify.promela
docs/atomics.txt
docs/blkdebug.txt
docs/blkverify.txt
docs/bootindex.txt
docs/ccid.txt
docs/ich9-ehci-uhci.cfg
docs/image-fuzzer.txt
docs/libcacard.txt
docs/live-block-ops.txt
docs/memory.txt
docs/migration.txt
docs/multiple-iothreads.txt
docs/multiseat.txt
docs/q35-chipset.cfg
docs/qapi-code-gen.txt
docs/qdev-device-use.txt
docs/qemupciserial.inf
docs/qmp/README
docs/qmp/qmp-events.txt
docs/qmp/qmp-spec.txt
docs/rdma.txt
docs/specs/acpi_cpu_hotplug.txt
docs/specs/acpi_mem_hotplug.txt
docs/specs/acpi_pci_hotplug.txt
docs/specs/ivshmem_device_spec.txt
docs/specs/pci-ids.txt
docs/specs/pci-serial.txt
docs/specs/pci-testdev.txt
docs/specs/ppc-spapr-hcalls.txt
docs/specs/pvpanic.txt
docs/specs/qcow2.txt
docs/specs/qed_spec.txt
docs/specs/standard-vga.txt
docs/specs/vhost-user.txt
docs/specs/vmw_pvscsi-spec.txt
docs/spice-port-fqdn.txt
docs/usb-storage.txt
docs/usb2.txt
docs/virtio-balloon-stats.txt
docs/vnc-ledstate-Pseudo-encoding.txt
docs/writing-qmp-commands.txt
docs/xbzrle.txt
dtc
dump.c
fpu/softfloat-macros.h
fpu/softfloat-specialize.h
fpu/softfloat.c
hmp.h
hw/Makefile.objs
hw/bt/Makefile.objs
hw/bt/core.c
hw/bt/hci-csr.c
hw/bt/hci.c
hw/bt/hid.c
hw/bt/l2cap.c
hw/bt/sdp.c
hw/char/Makefile.objs
hw/char/debugcon.c
hw/char/escc.c
hw/char/ipoctal232.c
hw/char/mcf_uart.c
hw/char/milkymist-uart.c
hw/char/parallel.c
hw/char/pl011.c
hw/char/sclpconsole-lm.c
hw/char/sclpconsole.c
hw/char/serial-isa.c
hw/char/serial-pci.c
hw/char/serial.c
hw/char/sh_serial.c
hw/char/xen_console.c
hw/core/Makefile.objs
hw/core/empty_slot.c
hw/core/fw-path-provider.c
hw/core/hotplug.c
hw/core/irq.c
hw/core/loader.c
hw/core/machine.c
hw/core/nmi.c
hw/core/null-machine.c
hw/core/ptimer.c
hw/core/qdev-properties-system.c
hw/core/qdev-properties.c
hw/core/qdev.c
hw/core/stream.c
hw/core/sysbus.c
hw/core/uboot_image.h
hw/cpu/Makefile.objs
hw/cpu/realview_mpcore.c
hw/display/Makefile.objs
hw/display/ads7846.c
hw/display/blizzard.c
hw/display/blizzard_template.h
hw/display/cg3.c
hw/display/cirrus_vga.c
hw/display/cirrus_vga_rop.h
hw/display/cirrus_vga_rop2.h
hw/display/framebuffer.c
hw/display/framebuffer.h
hw/display/g364fb.c
hw/display/jazz_led.c
hw/display/milkymist-tmu2.c
hw/display/milkymist-vgafb.c
hw/display/milkymist-vgafb_template.h
hw/display/pl110.c
hw/display/pl110_template.h
hw/display/pxa2xx_lcd.c
hw/display/pxa2xx_template.h
hw/display/sm501.c
hw/display/sm501_template.h
hw/display/ssd0303.c
hw/display/ssd0323.c
hw/display/tc6393xb.c
hw/display/tc6393xb_template.h
hw/display/tcx.c
hw/display/vga-helpers.h
hw/display/vga-isa-mm.c
hw/display/vga-isa.c
hw/display/vga-pci.c
hw/display/vga.c
hw/display/vga.h
hw/display/vga_int.h
hw/display/vmware_vga.c
hw/display/xenfb.c
hw/dma/Makefile.objs
hw/dma/i82374.c
hw/dma/i8257.c
hw/dma/pl080.c
hw/dma/pl330.c
hw/dma/pxa2xx_dma.c
hw/dma/rc4030.c
hw/dma/soc_dma.c
hw/dma/sparc32_dma.c
hw/dma/sun4m_iommu.c
hw/gpio/Makefile.objs
hw/gpio/max7310.c
hw/gpio/pl061.c
hw/gpio/zaurus.c
hw/i2c/Makefile.objs
hw/i2c/bitbang_i2c.c
hw/i2c/bitbang_i2c.h
hw/i2c/core.c
hw/i2c/pm_smbus.c
hw/i2c/smbus.c
hw/i2c/smbus_eeprom.c
hw/input/Makefile.objs
hw/input/adb.c
hw/input/hid.c
hw/input/lm832x.c
hw/input/milkymist-softusb.c
hw/input/pckbd.c
hw/input/pl050.c
hw/input/ps2.c
hw/input/pxa2xx_keypad.c
hw/input/tsc2005.c
hw/input/tsc210x.c
hw/input/vmmouse.c
hw/intc/Makefile.objs
hw/intc/apic.c
hw/intc/apic_common.c
hw/intc/arm_gic.c
hw/intc/arm_gic_common.c
hw/intc/arm_gic_kvm.c
hw/intc/armv7m_nvic.c
hw/intc/gic_internal.h
hw/intc/heathrow_pic.c
hw/intc/i8259.c
hw/intc/i8259_common.c
hw/intc/ioapic.c
hw/intc/ioapic_common.c
hw/intc/lm32_pic.c
hw/intc/openpic.c
hw/intc/openpic_kvm.c
hw/intc/pl190.c
hw/intc/realview_gic.c
hw/intc/sh_intc.c
hw/intc/slavio_intctl.c
hw/ipack/Makefile.objs
hw/ipack/ipack.c
hw/ipack/tpci200.c
hw/isa/Makefile.objs
hw/isa/apm.c
hw/isa/i82378.c
hw/isa/isa-bus.c
hw/isa/vt82c686.c
hw/m68k/Makefile.objs
hw/m68k/an5206.c
hw/m68k/dummy_m68k.c
hw/m68k/mcf5206.c
hw/m68k/mcf5208.c
hw/m68k/mcf_intc.c
hw/mem/Makefile.objs
hw/mem/pc-dimm.c
hw/misc/Makefile.objs
hw/misc/a9scu.c
hw/misc/applesmc.c
hw/misc/arm11scu.c
hw/misc/arm_integrator_debug.c
hw/misc/arm_l2x0.c
hw/misc/arm_sysctl.c
hw/misc/cbus.c
hw/misc/debugexit.c
hw/misc/eccmemctl.c
hw/misc/ivshmem.c
hw/misc/max111x.c
hw/misc/milkymist-hpdmc.c
hw/misc/milkymist-pfpu.c
hw/misc/mst_fpga.c
hw/misc/pc-testdev.c
hw/misc/pci-testdev.c
hw/misc/pvpanic.c
hw/misc/sga.c
hw/misc/slavio_misc.c
hw/misc/tmp105.c
hw/misc/tmp105.h
hw/misc/vmport.c
hw/moxie/Makefile.objs
hw/moxie/moxiesim.c
hw/net/Makefile.objs
hw/net/allwinner_emac.c
hw/net/dp8393x.c
hw/net/e1000.c
hw/net/e1000_regs.h
hw/net/eepro100.c
hw/net/fsl_etsec/etsec.c
hw/net/fsl_etsec/etsec.h
hw/net/fsl_etsec/miim.c
hw/net/fsl_etsec/registers.c
hw/net/fsl_etsec/registers.h
hw/net/fsl_etsec/rings.c
hw/net/lan9118.c
hw/net/lance.c
hw/net/mcf_fec.c
hw/net/milkymist-minimac2.c
hw/net/mipsnet.c
hw/net/ne2000-isa.c
hw/net/ne2000.c
hw/net/ne2000.h
hw/net/pcnet-pci.c
hw/net/pcnet.c
hw/net/pcnet.h
hw/net/rtl8139.c
hw/net/smc91c111.c
hw/net/vmware_utils.h
hw/net/xen_nic.c
hw/nvram/Makefile.objs
hw/nvram/ds1225y.c
hw/nvram/eeprom93xx.c
hw/nvram/fw_cfg.c
hw/nvram/mac_nvram.c
hw/pci-bridge/Makefile.objs
hw/pci-bridge/i82801b11.c
hw/pci-bridge/ioh3420.c
hw/pci-bridge/ioh3420.h
hw/pci-bridge/pci_bridge_dev.c
hw/pci-bridge/xio3130_downstream.c
hw/pci-bridge/xio3130_downstream.h
hw/pci-bridge/xio3130_upstream.c
hw/pci-bridge/xio3130_upstream.h
hw/pci-host/Makefile.objs
hw/pci-host/apb.c
hw/pci-host/bonito.c
hw/pci-host/ppce500.c
hw/pcmcia/Makefile.objs
hw/pcmcia/pcmcia.c
hw/pcmcia/pxa2xx.c
hw/sd/Makefile.objs
hw/sd/milkymist-memcard.c
hw/sd/pl181.c
hw/sd/pxa2xx_mmci.c
hw/sd/sd.c
hw/sd/sdhci.c
hw/sd/sdhci.h
hw/sd/ssi-sd.c
hw/timer/Makefile.objs
hw/timer/a9gtimer.c
hw/timer/arm_mptimer.c
hw/timer/arm_timer.c
hw/timer/ds1338.c
hw/timer/hpet.c
hw/timer/i8254.c
hw/timer/i8254_common.c
hw/timer/lm32_timer.c
hw/timer/m48t59.c
hw/timer/mc146818rtc.c
hw/timer/milkymist-sysctl.c
hw/timer/pl031.c
hw/timer/pxa2xx_timer.c
hw/timer/sh_timer.c
hw/timer/slavio_timer.c
hw/timer/tusb6010.c
hw/timer/twl92230.c
hw/tpm/Makefile.objs
hw/tpm/tpm_int.h
hw/tpm/tpm_passthrough.c
hw/tpm/tpm_tis.c
hw/tpm/tpm_tis.h
hw/virtio/Makefile.objs
hw/virtio/dataplane/Makefile.objs
hw/virtio/dataplane/vring.c
hw/watchdog/Makefile.objs
hw/watchdog/watchdog.c
hw/watchdog/wdt_i6300esb.c
hw/watchdog/wdt_ib700.c
hw/xen/Makefile.objs
hw/xen/xen-host-pci-device.c
hw/xen/xen-host-pci-device.h
hw/xen/xen_backend.c
hw/xen/xen_devconfig.c
hw/xen/xen_pt.c
hw/xen/xen_pt.h
hw/xen/xen_pt_config_init.c
hw/xen/xen_pt_msi.c
hw/xenpv/Makefile.objs
hw/xenpv/xen_domainbuild.c
hw/xenpv/xen_domainbuild.h
hw/xenpv/xen_machine_pv.c
include/block/accounting.h
include/block/aio.h
include/block/block.h
include/block/block_int.h
include/block/blockjob.h
include/block/coroutine.h
include/block/coroutine_int.h
include/block/nbd.h
include/block/qapi.h
include/block/scsi.h
include/block/snapshot.h
include/block/thread-pool.h
include/config.h
include/disas/bfd.h
include/disas/disas.h
include/elf.h
include/exec/address-spaces.h
include/exec/cpu-all.h
include/exec/cpu-common.h
include/exec/cpu-defs.h
include/exec/cpu_ldst.h
include/exec/cputlb.h
include/exec/exec-all.h
include/exec/gdbstub.h
include/exec/gen-icount.h
include/exec/hwaddr.h
include/exec/poison.h
include/exec/ram_addr.h
include/exec/softmmu-semi.h
include/exec/spinlock.h
include/exec/user/abitypes.h
include/exec/user/thunk.h
include/fpu/softfloat.h
include/glib-compat.h
include/hw/acpi/acpi.h
include/hw/acpi/acpi_dev_interface.h
include/hw/acpi/cpu_hotplug.h
include/hw/acpi/memory_hotplug.h
include/hw/acpi/pc-hotplug.h
include/hw/acpi/pcihp.h
include/hw/acpi/piix4.h
include/hw/acpi/tpm.h
include/hw/arm/arm.h
include/hw/arm/exynos4210.h
include/hw/arm/imx.h
include/hw/arm/omap.h
include/hw/arm/primecell.h
include/hw/arm/pxa.h
include/hw/arm/sharpsl.h
include/hw/arm/soc_dma.h
include/hw/audio/audio.h
include/hw/audio/pcspk.h
include/hw/block/block.h
include/hw/block/fdc.h
include/hw/block/flash.h
include/hw/boards.h
include/hw/bt.h
include/hw/char/digic-uart.h
include/hw/char/escc.h
include/hw/char/lm32_juart.h
include/hw/char/serial.h
include/hw/cpu/a15mpcore.h
include/hw/cpu/a9mpcore.h
include/hw/cpu/arm11mpcore.h
include/hw/cris/etraxfs.h
include/hw/cris/etraxfs_dma.h
include/hw/devices.h
include/hw/elf_ops.h
include/hw/empty_slot.h
include/hw/fw-path-provider.h
include/hw/hotplug.h
include/hw/hw.h
include/hw/i2c/i2c.h
include/hw/i2c/pm_smbus.h
include/hw/i2c/smbus.h
include/hw/input/adb.h
include/hw/input/hid.h
include/hw/input/ps2.h
include/hw/intc/arm_gic.h
include/hw/intc/arm_gic_common.h
include/hw/intc/realview_gic.h
include/hw/ipack/ipack.h
include/hw/irq.h
include/hw/isa/apm.h
include/hw/isa/i8259_internal.h
include/hw/isa/isa.h
include/hw/isa/pc87312.h
include/hw/isa/vt82c686.h
include/hw/kvm/clock.h
include/hw/lm32/lm32_pic.h
include/hw/loader.h
include/hw/m68k/mcf.h
include/hw/mem/pc-dimm.h
include/hw/mips/bios.h
include/hw/mips/cpudevs.h
include/hw/mips/mips.h
include/hw/misc/a9scu.h
include/hw/misc/arm11scu.h
include/hw/misc/arm_integrator_debug.h
include/hw/misc/tmp105_regs.h
include/hw/misc/vfio.h
include/hw/net/allwinner_emac.h
include/hw/nmi.h
include/hw/nvram/eeprom93xx.h
include/hw/nvram/fw_cfg.h
include/hw/nvram/openbios_firmware_abi.h
include/hw/pci-host/apb.h
include/hw/pci-host/ppce500.h
include/hw/pcmcia.h
include/hw/ppc/mac_dbdma.h
include/hw/ppc/openpic.h
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roms/Makefile
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roms/config.seabios-128k
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