io-controller: Document for blkio.weight_device
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From: Takuya Yoshikawa on 4 Mar 2010 06:30 Hi, I found a typo. Gui Jianfeng wrote: > +- blkio.weight_device > + - One can specify per cgroup per device rules using this interface. > + These rules override the default value of group weight as specified > + by blkio.weight. > + > + Following is the format. > + > + #echo dev_maj:dev_minor weight > /patch/to/cgroup/blkio.weight_device You mean "path to"? Thanks, Takuya > + > + weight=0 means removing weight on a given device. > + > + Examples: > + Configure weight=300 on /dev/sdb (8:16) in this cgroup > + # echo 8:16 300 > blkio.weight_device > + # cat blkio.weight_device > + dev weight > + 8:16 300 > + > + Configure weight=500 on /dev/sda (8:0) in this cgroup > + # echo 8:0 500 > blkio.weight_device > + # cat blkio.weight_device > + dev weight > + 8:0 500 > + 8:16 300 > + > + Remove specific weight for /dev/sda in this cgroup > + # echo 8:0 0 > blkio.weight_device > + # cat blkio.weight_device > + dev weight > + 8:16 300 > + > CFQ sysfs tunable > ================= > /sys/block/<disk>/queue/iosched/group_isolation -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Gui Jianfeng on 4 Mar 2010 19:50 Takuya Yoshikawa wrote: > Hi, I found a typo. > > Gui Jianfeng wrote: >> +- blkio.weight_device >> + - One can specify per cgroup per device rules using this interface. >> + These rules override the default value of group weight as >> specified >> + by blkio.weight. >> + >> + Following is the format. >> + >> + #echo dev_maj:dev_minor weight > >> /patch/to/cgroup/blkio.weight_device > > You mean "path to"? > yeah, will fix. Thanks Gui > Thanks, > Takuya > >> + >> + weight=0 means removing weight on a given device. >> + >> + Examples: >> + Configure weight=300 on /dev/sdb (8:16) in this cgroup >> + # echo 8:16 300 > blkio.weight_device >> + # cat blkio.weight_device >> + dev weight >> + 8:16 300 >> + >> + Configure weight=500 on /dev/sda (8:0) in this cgroup >> + # echo 8:0 500 > blkio.weight_device >> + # cat blkio.weight_device >> + dev weight >> + 8:0 500 >> + 8:16 300 >> + >> + Remove specific weight for /dev/sda in this cgroup >> + # echo 8:0 0 > blkio.weight_device >> + # cat blkio.weight_device >> + dev weight >> + 8:16 300 >> + >> CFQ sysfs tunable >> ================= >> /sys/block/<disk>/queue/iosched/group_isolation > > > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Takuya Yoshikawa on 4 Mar 2010 21:50 Hi, thank you for fixing ... Gui Jianfeng wrote: > +- blkio.weight_device > + - One can specify per cgroup per device rules using this interface. > + These rules override the default value of group weight as specified > + by blkio.weight. > + > + Following is the format. > + > + #echo dev_maj:dev_minor weight > /pach/to/cgroup/blkio.weight_device You deleted wrong character! We need 't' not 'c'. Thanks, Takuya > + > + weight=0 means removing weight on a given device. > + > + Examples: > + Configure weight=300 on /dev/sdb (8:16) in this cgroup > + # echo 8:16 300 > blkio.weight_device > + # cat blkio.weight_device > + dev weight > + 8:16 300 > + > + Configure weight=500 on /dev/sda (8:0) in this cgroup > + # echo 8:0 500 > blkio.weight_device > + # cat blkio.weight_device > + dev weight > + 8:0 500 > + 8:16 300 > + > + Remove specific weight for /dev/sda in this cgroup > + # echo 8:0 0 > blkio.weight_device > + # cat blkio.weight_device > + dev weight > + 8:16 300 > + > CFQ sysfs tunable > ================= > /sys/block/<disk>/queue/iosched/group_isolation -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Gui Jianfeng on 4 Mar 2010 21:50 Takuya Yoshikawa wrote: > Hi, thank you for fixing ... > > Gui Jianfeng wrote: >> +- blkio.weight_device >> + - One can specify per cgroup per device rules using this interface. >> + These rules override the default value of group weight as >> specified >> + by blkio.weight. >> + >> + Following is the format. >> + >> + #echo dev_maj:dev_minor weight > >> /pach/to/cgroup/blkio.weight_device > > You deleted wrong character! We need 't' not 'c'. OOPS, Sorry :( -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Vivek Goyal on 5 Mar 2010 09:20
On Fri, Mar 05, 2010 at 10:26:39AM +0800, Gui Jianfeng wrote: > Here is the document for blkio.weight_device > > Signed-off-by: Gui Jianfeng <guijianfeng(a)cn.fujitsu.com> Looks good to me. Acked-by: Vivek Goyal <vgoyal(a)redhat.com> Vivek > --- > Documentation/cgroups/blkio-controller.txt | 35 +++++++++++++++++++++++++++- > 1 files changed, 34 insertions(+), 1 deletions(-) > > diff --git a/Documentation/cgroups/blkio-controller.txt b/Documentation/cgroups/blkio-controller.txt > index 630879c..e551c85 100644 > --- a/Documentation/cgroups/blkio-controller.txt > +++ b/Documentation/cgroups/blkio-controller.txt > @@ -76,7 +76,9 @@ CONFIG_DEBUG_BLK_CGROUP > Details of cgroup files > ======================= > - blkio.weight > - - Specifies per cgroup weight. > + - Specifies per cgroup weight. This is default weight of the group > + on all the devices until and unless overridden by per device rule. > + (See blkio.weight_device). > > Currently allowed range of weights is from 100 to 1000. > > @@ -99,6 +101,37 @@ Details of cgroup files > and minor number of the device and third field specifies the number > of times a group was dequeued from a particular device. > > +- blkio.weight_device > + - One can specify per cgroup per device rules using this interface. > + These rules override the default value of group weight as specified > + by blkio.weight. > + > + Following is the format. > + > + #echo dev_maj:dev_minor weight > /pach/to/cgroup/blkio.weight_device > + > + weight=0 means removing weight on a given device. > + > + Examples: > + Configure weight=300 on /dev/sdb (8:16) in this cgroup > + # echo 8:16 300 > blkio.weight_device > + # cat blkio.weight_device > + dev weight > + 8:16 300 > + > + Configure weight=500 on /dev/sda (8:0) in this cgroup > + # echo 8:0 500 > blkio.weight_device > + # cat blkio.weight_device > + dev weight > + 8:0 500 > + 8:16 300 > + > + Remove specific weight for /dev/sda in this cgroup > + # echo 8:0 0 > blkio.weight_device > + # cat blkio.weight_device > + dev weight > + 8:16 300 > + > CFQ sysfs tunable > ================= > /sys/block/<disk>/queue/iosched/group_isolation > -- > 1.5.4.rc3 > > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |