Re: Reclaim space from unused ramdisk?
>>It ships with util-linux. Weird that a distro would omit it. > >Euh, is it already included in util-linux-2.12q? I hate me. It was not in $PATH (/sbin). - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: Reclaim space from unused ramdisk?
>> >> } >> > >> >hmm, yes. That's a special-case in the ramdisk driver. >> >The command `blockdev --flushbufs /dev/ram0' should have the same effect. >> >> Interesting. Command not found, here. URL? > >It ships with util-linux. Weird that a distro would omit it. Don't look at me, look at SUSE. Euh, is it already included in util-linux-2.12q? Jan Engelhardt -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: Reclaim space from unused ramdisk?
Jan Engelhardt <[EMAIL PROTECTED]> wrote: > > >> } > >> > > > >hmm, yes. That's a special-case in the ramdisk driver. > > > >The command `blockdev --flushbufs /dev/ram0' should have the same effect. > > Interesting. Command not found, here. URL? > It ships with util-linux. Weird that a distro would omit it. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: Reclaim space from unused ramdisk?
>> } >> > >hmm, yes. That's a special-case in the ramdisk driver. > >The command `blockdev --flushbufs /dev/ram0' should have the same effect. Interesting. Command not found, here. URL? Jan Engelhardt -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: Reclaim space from unused ramdisk?
Jan Engelhardt <[EMAIL PROTECTED]> wrote:
>
> >I wonder if it would be possible to somehow reclaim space that has
> >been previously reserved for a ramdisk without rebooting.
>
> free_ramdisk.c:
>
> #include
> #include
> #include
> #include
> #include
> #include
> #include
> #include
> #include
>
> int main(int argc, const char **argv) {
> int eax = 0;
> while(*argv != NULL) {
> int fd = open(*argv, O_RDWR);
> if(fd < 0) {
> fprintf(stderr, "Warning: Cannot open %s: %s\n",
> *argv, strerror(errno));
> if(eax == 0) { eax = errno; }
> continue;
> }
> ioctl(fd, BLKFLSBUF, 0);
> close(fd);
> ++argv;
> }
> return eax == 0;
> }
>
hmm, yes. That's a special-case in the ramdisk driver.
The command `blockdev --flushbufs /dev/ram0' should have the same effect.
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Re: Reclaim space from unused ramdisk?
>I wonder if it would be possible to somehow reclaim space that has
>been previously reserved for a ramdisk without rebooting.
free_ramdisk.c:
#include
#include
#include
#include
#include
#include
#include
#include
#include
int main(int argc, const char **argv) {
int eax = 0;
while(*argv != NULL) {
int fd = open(*argv, O_RDWR);
if(fd < 0) {
fprintf(stderr, "Warning: Cannot open %s: %s\n",
*argv, strerror(errno));
if(eax == 0) { eax = errno; }
continue;
}
ioctl(fd, BLKFLSBUF, 0);
close(fd);
++argv;
}
return eax == 0;
}
//eof
>How difficult would this be to write?
Jan Engelhardt
--
| Alphagate Systems, http://alphagate.hopto.org/
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Re: Reclaim space from unused ramdisk?
I wonder if it would be possible to somehow reclaim space that has
been previously reserved for a ramdisk without rebooting.
free_ramdisk.c:
#include sys/ioctl.h
#include sys/mount.h
#include sys/stat.h
#include sys/types.h
#include errno.h
#include fcntl.h
#include stdio.h
#include string.h
#include unistd.h
int main(int argc, const char **argv) {
int eax = 0;
while(*argv != NULL) {
int fd = open(*argv, O_RDWR);
if(fd 0) {
fprintf(stderr, Warning: Cannot open %s: %s\n,
*argv, strerror(errno));
if(eax == 0) { eax = errno; }
continue;
}
ioctl(fd, BLKFLSBUF, 0);
close(fd);
++argv;
}
return eax == 0;
}
//eof
How difficult would this be to write?
Jan Engelhardt
--
| Alphagate Systems, http://alphagate.hopto.org/
-
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the body of a message to [EMAIL PROTECTED]
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Please read the FAQ at http://www.tux.org/lkml/
Re: Reclaim space from unused ramdisk?
Jan Engelhardt [EMAIL PROTECTED] wrote:
I wonder if it would be possible to somehow reclaim space that has
been previously reserved for a ramdisk without rebooting.
free_ramdisk.c:
#include sys/ioctl.h
#include sys/mount.h
#include sys/stat.h
#include sys/types.h
#include errno.h
#include fcntl.h
#include stdio.h
#include string.h
#include unistd.h
int main(int argc, const char **argv) {
int eax = 0;
while(*argv != NULL) {
int fd = open(*argv, O_RDWR);
if(fd 0) {
fprintf(stderr, Warning: Cannot open %s: %s\n,
*argv, strerror(errno));
if(eax == 0) { eax = errno; }
continue;
}
ioctl(fd, BLKFLSBUF, 0);
close(fd);
++argv;
}
return eax == 0;
}
hmm, yes. That's a special-case in the ramdisk driver.
The command `blockdev --flushbufs /dev/ram0' should have the same effect.
-
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the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Re: Reclaim space from unused ramdisk?
} hmm, yes. That's a special-case in the ramdisk driver. The command `blockdev --flushbufs /dev/ram0' should have the same effect. Interesting. Command not found, here. URL? Jan Engelhardt -- - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: Reclaim space from unused ramdisk?
Jan Engelhardt [EMAIL PROTECTED] wrote: } hmm, yes. That's a special-case in the ramdisk driver. The command `blockdev --flushbufs /dev/ram0' should have the same effect. Interesting. Command not found, here. URL? It ships with util-linux. Weird that a distro would omit it. - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: Reclaim space from unused ramdisk?
} hmm, yes. That's a special-case in the ramdisk driver. The command `blockdev --flushbufs /dev/ram0' should have the same effect. Interesting. Command not found, here. URL? It ships with util-linux. Weird that a distro would omit it. Don't look at me, look at SUSE. Euh, is it already included in util-linux-2.12q? Jan Engelhardt -- - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: Reclaim space from unused ramdisk?
It ships with util-linux. Weird that a distro would omit it. Euh, is it already included in util-linux-2.12q? I hate me. It was not in $PATH (/sbin). - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: Reclaim space from unused ramdisk?
On Tue, 26 Jul 2005 15:16:58 -0700 Mike Mohr <[EMAIL PROTECTED]> wrote: > I wonder if it would be possible to somehow reclaim space that has > been previously reserved for a ramdisk without rebooting. I read the > ramdisk docs in the latest kernel source and it seems that it is not > currently possible. However, the kernel keeps track of the memory > allocated for said ramdisks; would it not be possible with root (or > even kernel) permissions to remove the flag that prevents the VM > subsystem from reclaiming that space? I realize that rot permissions > may not be high enough. In that case, could a module be written that > takes a device name as a parameter then uses it to look up the > reserved memory that device uses, then resets the necessary flag and > finally unloads itself? It would have to check that the filesystem > was unmounted, of course. > > How difficult would this be to write? Hi, ramfs (always there) and tmpfs (optional) already do this. tmpfs can be swapped out, ramfs always uses physical memory. mount -t ramfs none /mnt/blah mount -t tmpfs none /mnt/blah Regards - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Reclaim space from unused ramdisk?
I wonder if it would be possible to somehow reclaim space that has been previously reserved for a ramdisk without rebooting. I read the ramdisk docs in the latest kernel source and it seems that it is not currently possible. However, the kernel keeps track of the memory allocated for said ramdisks; would it not be possible with root (or even kernel) permissions to remove the flag that prevents the VM subsystem from reclaiming that space? I realize that rot permissions may not be high enough. In that case, could a module be written that takes a device name as a parameter then uses it to look up the reserved memory that device uses, then resets the necessary flag and finally unloads itself? It would have to check that the filesystem was unmounted, of course. How difficult would this be to write? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Reclaim space from unused ramdisk?
I wonder if it would be possible to somehow reclaim space that has been previously reserved for a ramdisk without rebooting. I read the ramdisk docs in the latest kernel source and it seems that it is not currently possible. However, the kernel keeps track of the memory allocated for said ramdisks; would it not be possible with root (or even kernel) permissions to remove the flag that prevents the VM subsystem from reclaiming that space? I realize that rot permissions may not be high enough. In that case, could a module be written that takes a device name as a parameter then uses it to look up the reserved memory that device uses, then resets the necessary flag and finally unloads itself? It would have to check that the filesystem was unmounted, of course. How difficult would this be to write? - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: Reclaim space from unused ramdisk?
On Tue, 26 Jul 2005 15:16:58 -0700 Mike Mohr [EMAIL PROTECTED] wrote: I wonder if it would be possible to somehow reclaim space that has been previously reserved for a ramdisk without rebooting. I read the ramdisk docs in the latest kernel source and it seems that it is not currently possible. However, the kernel keeps track of the memory allocated for said ramdisks; would it not be possible with root (or even kernel) permissions to remove the flag that prevents the VM subsystem from reclaiming that space? I realize that rot permissions may not be high enough. In that case, could a module be written that takes a device name as a parameter then uses it to look up the reserved memory that device uses, then resets the necessary flag and finally unloads itself? It would have to check that the filesystem was unmounted, of course. How difficult would this be to write? Hi, ramfs (always there) and tmpfs (optional) already do this. tmpfs can be swapped out, ramfs always uses physical memory. mount -t ramfs none /mnt/blah mount -t tmpfs none /mnt/blah Regards - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
