On 12.10.2013, at 18:14, Konstantin Belousov wrote:
>>
>> First I tried with some swap space configured. The OS started to swap out
>> my process after it reached about 20GB which is also not what I expected:
>> what is the reason to swap out regions of read-only mmap()ed files? Is it
>>
On Sat, Oct 12, 2013 at 04:04:31PM +0400, Dmitry Sivachenko wrote:
>
> On 12.10.2013, at 13:59, Konstantin Belousov wrote:
> >
> > I was not able to reproduce the situation locally. I even tried to start
> > a lot of threads accessing the mapped regions, to try to outrun the
> > pagedaemon. The
On 12.10.2013, at 13:59, Konstantin Belousov wrote:
>
> I was not able to reproduce the situation locally. I even tried to start
> a lot of threads accessing the mapped regions, to try to outrun the
> pagedaemon. The user threads sleep on the disk read, while pagedaemon
> has a lot of time to re
On Fri, Oct 11, 2013 at 09:57:24AM +0400, Dmitry Sivachenko wrote:
>
> On 11.10.2013, at 9:17, Konstantin Belousov wrote:
>
> > On Wed, Oct 09, 2013 at 03:42:27PM +0400, Dmitry Sivachenko wrote:
> >> Hello!
> >>
> >> I have a program which mmap()s a lot of large files (total size more that
> >
On 11.10.2013, at 9:17, Konstantin Belousov wrote:
> On Wed, Oct 09, 2013 at 03:42:27PM +0400, Dmitry Sivachenko wrote:
>> Hello!
>>
>> I have a program which mmap()s a lot of large files (total size more that
>> RAM and I have no swap), but it needs only small parts of that files at a
>> tim
On Wed, Oct 09, 2013 at 03:42:27PM +0400, Dmitry Sivachenko wrote:
> Hello!
>
> I have a program which mmap()s a lot of large files (total size more that RAM
> and I have no swap), but it needs only small parts of that files at a time.
>
> My understanding is that when using mmap when I access s
On Wed, 9 Oct 2013 15:42:27 +0400
Dmitry Sivachenko wrote:
> Hello!
>
> I have a program which mmap()s a lot of large files (total size more
> that RAM and I have no swap), but it needs only small parts of that
> files at a time.
>
> My understanding is that when using mmap when I access some me
Hello!
I have a program which mmap()s a lot of large files (total size more that RAM
and I have no swap), but it needs only small parts of that files at a time.
My understanding is that when using mmap when I access some memory region OS
reads the relevant portion of that file from disk and cac
Guys,
if we the following on FreeBSD (pseudo-code):
fd = open(/dev/dsp, O_RDWR);
mmap(PROT_READ, fd);
mmap(PROT_WRITE, fd);
This won't work entirely correctly, right?
I base my question on some observations of how a particular program behaves on
FreeBSD and on the following comment in sys/dev/
On Thu, 30 May 2002, Tom Tang wrote:
> Thanks for the reply, I'll check it out. However
> if you'll notice in my prev mail, I stated that I was
> trying to contigmalloc 4K... Hard to believe that
> the system doesnt have 4K lying around.
Good point.
Contigmallocing a page is pretty silly, si
On Thu, 2002-05-30 at 13:14, Tom Tang wrote:
> Hello,
>
> I have a question about implementing mmap functions in
> device drivers. Thinking it would be simple, I contigmalloc'd
> a buffer of PAGE_SIZE and returned it using atop like other
> mmap device implementations. However when my userlan
Doug,
Thanks for the reply, I'll check it out. However
if you'll notice in my prev mail, I stated that I was
trying to contigmalloc 4K... Hard to believe that
the system doesnt have 4K lying around.
- Tom
On Thu, 30 May 2002, Doug White wrote:
> On Thu, 30 May 2002, Tom Tang wrote:
>
> >
On Thu, 30 May 2002, Tom Tang wrote:
> I have a question about implementing mmap functions in
> device drivers. Thinking it would be simple, I contigmalloc'd
> a buffer of PAGE_SIZE and returned it using atop like other
> mmap device implementations. However when my userland program
> mmaps t
Hello,
I have a question about implementing mmap functions in
device drivers. Thinking it would be simple, I contigmalloc'd
a buffer of PAGE_SIZE and returned it using atop like other
mmap device implementations. However when my userland program
mmaps the device with offset 0, when I try acce
In article <000101bec73c$e20e3660$291c4...@kbyanc.alcnet.com>,
Kelly Yancey wrote:
>
> Also, in case it hasn't been notice already (I'm running -stable from May
> 18th), the mmap(2) manpage has a typo: it has "#include "
So what's the typo, exactly?
John
--
John Polstra
In article <000101bec73c$e20e3660$[EMAIL PROTECTED]>,
Kelly Yancey <[EMAIL PROTECTED]> wrote:
>
> Also, in case it hasn't been notice already (I'm running -stable from May
> 18th), the mmap(2) manpage has a typo: it has "#include "
So what's the typo, exactly?
John
--
John Polstra
: Which is fine and dandy, I'll just stat() the file to get the filesize and
:mmap() it. But what happens in someone comes along and replaces the file
:with
:a larger file? I understand that my view of the file will change to the new
:file, but only the length that I mmap()ed originally. Do I have
: Which is fine and dandy, I'll just stat() the file to get the filesize and
:mmap() it. But what happens in someone comes along and replaces the file
:with
:a larger file? I understand that my view of the file will change to the new
:file, but only the length that I mmap()ed originally. Do I hav
I have a quick question about mmap, hopefully someone can smack me and
point
out what I'm missing :)
the man page says:
The mmap() function causes the pages starting at addr and continuing for
at most len bytes to be mapped from the object described by fd, starting
at byte offset
I have a quick question about mmap, hopefully someone can smack me and
point
out what I'm missing :)
the man page says:
The mmap() function causes the pages starting at addr and continuing for
at most len bytes to be mapped from the object described by fd, starting
at byte offset
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