Fwd: [DCR] Remove devstat

From: Sue Howard (howardsue_at_gmail.com)
Date: 06/14/05

  • Next message: Poul-Henning Kamp: "Re: Fwd: [DCR] Remove devstat" 
    Date: Tue, 14 Jun 2005 20:30:58 +0800
To: arch@freebsd.org

    2005/6/14, Poul-Henning Kamp <phk@phk.freebsd.dk>:
    > In message <1e89cd510506140433437f7b7@mail.gmail.com>, Sue Howard writes:
    > >Hi,
    > >
    > >I found devstat is not widely used in the device drivers. Based the
    > >grep result of 'devstat_new_entry', it shows only cam, ata, fd,
    > >geom_disk are using it. In my workstation, the output of 'sysctl
    > >kern.devstat' shows:
    >
    > >I am wondering if devstat can be replaced by the sysctl nodes %desc,
    > >%pnpinfo etc that jhb introduced. Almost all the information devstat
    > >can provide can be also exposed by such sysctl node.
    >
    > Uhm, are we confused here ?
    >
    > Devstat is what is used for collecting transaction statistics for
    > disks and scsi general devices in general.
    >
    > Programs like iostat and gstat uses it.
    >
    > The old access path (iostat) uses sysctls, but the new and practically
    > overhead free access path is mmap(2) which gstat uses.

    I am confused because, in the devstat.h file, it defines an enum
    devstat_type_flags that I am interested in. This enum defines the
    devices type(catalog). I think this type should be a general property
    of a device driver. So I think devstat is a general framework to
    collect all types of the information related to a device.

    Anyway, since devicestat is only used for collect statistics, I'd like
    to remove the this type from the devstat. And we can implement this
    type into devclass(device_t?? maybe). This is what I proposed. It will
    bring some benifits like remove the long regex to match NIC interface
    in devd.conf, etc.

    Howard
    _______________________________________________
    freebsd-arch@freebsd.org mailing list
    http://lists.freebsd.org/mailman/listinfo/freebsd-arch
    To unsubscribe, send any mail to "freebsd-arch-unsubscribe@freebsd.org"

  • Next message: Poul-Henning Kamp: "Re: Fwd: [DCR] Remove devstat"

    Relevant Pages

    • Re: [DCR] Remove devstat
      ... >I found devstat is not widely used in the device drivers. ... >can provide can be also exposed by such sysctl node. ... The old access path uses sysctls, ...
      (freebsd-arch)
    • [DCR] Remove devstat
      ... I found devstat is not widely used in the device drivers. ... grep result of 'devstat_new_entry', it shows only cam, ata, fd, ... I am wondering if devstat can be replaced by the sysctl nodes %desc, ...
      (freebsd-arch)