lkml.org 
[lkml]   [2008]   [Dec]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH] Compress kernel modules on installation
    On Fri, 26 Dec 2008, Roland wrote:

    > what about some "make modules_install_compressed" instead ?
    >
    > as i have run out of diskspace quite often when installing test kernels, i
    > think we really need a feature like this.
    >
    > i`d also favour the makefile approach.
    > why another kconfig option?
    >
    > jan`s patch looks clean and simple, but i think it`s a little bit
    > intrusive...

    by default the main kernel is compressed, why should the modules not be
    compressed by default as well?

    > regards
    > roland
    >
    > ps:
    > i`d use gzip without "-9" as this gives very little space savings. it mostly
    > burns cpu and slows things down too much.
    > ( see
    > http://www.linuxjournal.com/files/linuxjournal.com/linuxjournal/articles/080/8051/8051f1.png
    > )

    this varies a lot on the particulars of the data being compressed. I don't
    know what difference it makes on the kernel modules, but I have seen it be
    worth it in some other cases.

    however, I do need to ask what the sizes of the resulting files end up
    being (on my system the last kernel that used modules was 2.4.31, so I
    can't just look this up myself). in most cases disks are formatted with 4K
    blocks, so unless it shrinks across such a boundry it's not actually going
    to help much.

    one other thing to consider would be some ability to load the module out
    of a tar or cpio bundle, that way you end up saving all the partial blocks
    from each module as well.

    David Lang

    >
    > On Friday 2008-12-26 20:48, Sam Ravnborg wrote:
    >> > > >
    >> > > > This patch allows kernel modules to be compressed when 'make
    >> > > > modules_install' is run after being copied to
    >> > > > the /lib/module/<version>/<...> directory which is useful if you > >
    >> > have
    >> > > > module-init-tools installed with --enable-zlib. This patch adds an
    >> > > > option (MODULE_COMPRESS) to the kernel configuration file > > >
    >> (specifically
    >> > > > init/Kconfig) so that the kernel modules will compressed if
    >> > > > MODULE_COMPRESS is set.
    >> >
    >> > I recently started compressing my kernel modules and that saved me
    >> > at least 70 MB of disk space on mostlyallmodconfig.
    >> > (And no, the argument of disks being cheap is not so true with
    >> > CF or SSD.)
    >> > Distro is lazy and wants to wait for upstream to have it,
    >> > so is there any chance of getting this proposal in?
    >>
    >> Steve said he wanted to try to make the solution more
    >> scalable so I am awaiting a new patch.
    >
    > Hm, all I needed was this patch. It might fire up some people,
    > but it's got all the scalability I could think of..
    >
    >
    > commit b4a3e1c610c99d4e8b543b97fd722076c6f7c5dd
    > Author: Jan Engelhardt <jengelh@medozas.de>
    > Date: Wed Dec 10 20:39:21 2008 +0100
    >
    > build: install modules compressed
    > ---
    > scripts/Makefile.modinst | 2 +-
    > 1 files changed, 1 insertions(+), 1 deletions(-)
    >
    > diff --git a/scripts/Makefile.modinst b/scripts/Makefile.modinst
    > index efa5d94..c3421a1 100644
    > --- a/scripts/Makefile.modinst
    > +++ b/scripts/Makefile.modinst
    > @@ -17,7 +17,7 @@ __modinst: $(modules)
    > @:
    >
    > quiet_cmd_modules_install = INSTALL $@
    > - cmd_modules_install = mkdir -p $(2); cp $@ $(2) ; $(mod_strip_cmd) \
    > $(2)/$(notdir $@) + cmd_modules_install = mkdir -p $(2); cp $@ $(2) ; \
    > $(mod_strip_cmd) $(2)/$(notdir $@); gzip -9f $(2)/$(notdir $@)
    > # Modules built outside the kernel source tree go into extra by default
    > INSTALL_MOD_DIR ?= extra
    > --
    >
    >
    >
    >
    >
    > --
    > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    > the body of a message to majordomo@vger.kernel.org
    > More majordomo info at http://vger.kernel.org/majordomo-info.html
    > Please read the FAQ at http://www.tux.org/lkml/
    >


    \
     
     \ /
      Last update: 2008-12-26 22:03    [W:0.025 / U:148.644 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site