* Big reserved mappings on x86_64
@ 2007-04-25 8:42 Jan Engelhardt
2007-04-25 8:49 ` Jakub Jelinek
0 siblings, 1 reply; 4+ messages in thread
From: Jan Engelhardt @ 2007-04-25 8:42 UTC (permalink / raw)
To: Linux Kernel Mailing List
Hello,
I noticed that on x86_64, the VSZ indicator (`ps u $$`) is quite high,
compared to i386 or sparc64.
10:32 ichi:~ > ps u $$ # i686
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
jengelh 4950 0.2 0.2 4776 2112 pts/4 Ss 10:32 0:00 -bash
10:36 sun:~ > ps u $$ # sparc64
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
jengelh 17842 0.0 0.0 6320 1960 pts/0 Ss 10:36 0:00 -bash
10:36 opteron:~ > ps u $$ # x86_64
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
jengelh 4403 0.0 0.2 23808 2632 pts/3 Ss 10:27 0:00 -bash
I actually took a look at `pmap $$`, which reveals that a lot of shared
libraries map 2044K or 2048K unreadable-unwritable-private
mappings...for _what_ purpose?
10:37 opteron:~ > pmap $$
4403: bash
START SIZE RSS DIRTY PERM MAPPING
2ae6cca70000 212K 172K 0K r-xp /lib64/libreadline.so.5.2
2ae6ccaa5000 2044K 0K 0K ---p /lib64/libreadline.so.5.2 <--
2ae6ccca4000 4K 4K 4K r--p /lib64/libreadline.so.5.2
2ae6ccca5000 28K 28K 28K rw-p /lib64/libreadline.so.5.2
2ae6cccac000 8K 8K 8K rw-p [anon]
2ae6cccae000 28K 16K 0K r-xp /lib64/libhistory.so.5.2
2ae6cccb5000 2048K 0K 0K ---p /lib64/libhistory.so.5.2 <--
2ae6cceb5000 8K 8K 8K rw-p /lib64/libhistory.so.5.2
2ae6cceb7000 320K 208K 0K r-xp /lib64/libncurses.so.5.5
2ae6ccf07000 2048K 0K 0K ---p /lib64/libncurses.so.5.5 <--
2ae6cd107000 48K 48K 48K r--p /lib64/libncurses.so.5.5
2ae6cd113000 28K 28K 28K rw-p /lib64/libncurses.so.5.5
[...]
What could these ominous mappings be? Does anyone else see that -
perhaps someone with x86_64 && !(opensuse 10.2)?
Jan
--
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Big reserved mappings on x86_64
2007-04-25 8:42 Big reserved mappings on x86_64 Jan Engelhardt
@ 2007-04-25 8:49 ` Jakub Jelinek
2007-04-25 9:30 ` Eric Dumazet
0 siblings, 1 reply; 4+ messages in thread
From: Jakub Jelinek @ 2007-04-25 8:49 UTC (permalink / raw)
To: Jan Engelhardt; +Cc: Linux Kernel Mailing List
On Wed, Apr 25, 2007 at 10:42:20AM +0200, Jan Engelhardt wrote:
> I actually took a look at `pmap $$`, which reveals that a lot of shared
> libraries map 2044K or 2048K unreadable-unwritable-private
> mappings...for _what_ purpose?
>
> 10:37 opteron:~ > pmap $$
> 4403: bash
> START SIZE RSS DIRTY PERM MAPPING
> 2ae6cca70000 212K 172K 0K r-xp /lib64/libreadline.so.5.2
> 2ae6ccaa5000 2044K 0K 0K ---p /lib64/libreadline.so.5.2 <--
> 2ae6ccca4000 4K 4K 4K r--p /lib64/libreadline.so.5.2
> 2ae6ccca5000 28K 28K 28K rw-p /lib64/libreadline.so.5.2
> 2ae6cccac000 8K 8K 8K rw-p [anon]
> 2ae6cccae000 28K 16K 0K r-xp /lib64/libhistory.so.5.2
> 2ae6cccb5000 2048K 0K 0K ---p /lib64/libhistory.so.5.2 <--
> 2ae6cceb5000 8K 8K 8K rw-p /lib64/libhistory.so.5.2
> 2ae6cceb7000 320K 208K 0K r-xp /lib64/libncurses.so.5.5
> 2ae6ccf07000 2048K 0K 0K ---p /lib64/libncurses.so.5.5 <--
> 2ae6cd107000 48K 48K 48K r--p /lib64/libncurses.so.5.5
> 2ae6cd113000 28K 28K 28K rw-p /lib64/libncurses.so.5.5
> [...]
>
> What could these ominous mappings be? Does anyone else see that -
> perhaps someone with x86_64 && !(opensuse 10.2)?
While i386 only supports 4KB pages, x86_64 ELF objects ought to support
up to 2MB pages. The gap between read-only/executable and writable segments
is intentionally mapped PROT_NONE, so that other things aren't mapped in
between the segments.
Jakub
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Big reserved mappings on x86_64
2007-04-25 8:49 ` Jakub Jelinek
@ 2007-04-25 9:30 ` Eric Dumazet
2007-04-25 9:59 ` Jan Engelhardt
0 siblings, 1 reply; 4+ messages in thread
From: Eric Dumazet @ 2007-04-25 9:30 UTC (permalink / raw)
To: Jakub Jelinek; +Cc: Jan Engelhardt, Linux Kernel Mailing List
On Wed, 25 Apr 2007 04:49:31 -0400
Jakub Jelinek <jakub@redhat.com> wrote:
> On Wed, Apr 25, 2007 at 10:42:20AM +0200, Jan Engelhardt wrote:
> > I actually took a look at `pmap $$`, which reveals that a lot of shared
> > libraries map 2044K or 2048K unreadable-unwritable-private
> > mappings...for _what_ purpose?
> >
> > 10:37 opteron:~ > pmap $$
> > 4403: bash
> > START SIZE RSS DIRTY PERM MAPPING
> > 2ae6cca70000 212K 172K 0K r-xp /lib64/libreadline.so.5.2
> > 2ae6ccaa5000 2044K 0K 0K ---p /lib64/libreadline.so.5.2 <--
> > 2ae6ccca4000 4K 4K 4K r--p /lib64/libreadline.so.5.2
> > 2ae6ccca5000 28K 28K 28K rw-p /lib64/libreadline.so.5.2
> > 2ae6cccac000 8K 8K 8K rw-p [anon]
> > 2ae6cccae000 28K 16K 0K r-xp /lib64/libhistory.so.5.2
> > 2ae6cccb5000 2048K 0K 0K ---p /lib64/libhistory.so.5.2 <--
> > 2ae6cceb5000 8K 8K 8K rw-p /lib64/libhistory.so.5.2
> > 2ae6cceb7000 320K 208K 0K r-xp /lib64/libncurses.so.5.5
> > 2ae6ccf07000 2048K 0K 0K ---p /lib64/libncurses.so.5.5 <--
> > 2ae6cd107000 48K 48K 48K r--p /lib64/libncurses.so.5.5
> > 2ae6cd113000 28K 28K 28K rw-p /lib64/libncurses.so.5.5
> > [...]
> >
> > What could these ominous mappings be? Does anyone else see that -
> > perhaps someone with x86_64 && !(opensuse 10.2)?
>
> While i386 only supports 4KB pages, x86_64 ELF objects ought to support
> up to 2MB pages. The gap between read-only/executable and writable segments
> is intentionally mapped PROT_NONE, so that other things aren't mapped in
> between the segments.
>
This makes sense for catching some programming errors, but it also has a cost for innocent users, since it adds one vm_area_struct per dll.
It slows down all find_vma() operations that tend to be done quite frequently these days :(
Even with a rbtree, adding 150 vm_area_struct increase memory needs and cache misses.
Maybe these PROT_NONE mappings could be done iff some LD_DEBUG or other ld.so variable says so ?
BTW I dont see such mappings on my 32bit distro (Ubuntu 7.04, glibc-2.5)
$ pmap 6791|grep .so
aa566000 2036K r-x-- /home/edumazet/.mozilla/plugins/libflashplayer.so
aa763000 64K rw--- /home/edumazet/.mozilla/plugins/libflashplayer.so
b07da000 220K r-x-- /usr/lib/firefox/libnssckbi.so
b0811000 36K rw--- /usr/lib/firefox/libnssckbi.so
b081a000 252K r-x-- /usr/lib/libfreebl3.so
b0859000 4K rw--- /usr/lib/libfreebl3.so
b105b000 300K r-x-- /usr/lib/libsoftokn3.so
b10a6000 16K rw--- /usr/lib/libsoftokn3.so
b10aa000 436K r-x-- /usr/lib/libnss3.so
b1117000 20K rw--- /usr/lib/libnss3.so
b111c000 160K r-x-- /usr/lib/libssl3.so
b1144000 8K rw--- /usr/lib/libssl3.so
b1146000 136K r-x-- /usr/lib/libsmime3.so
b1168000 8K rw--- /usr/lib/libsmime3.so
b116a000 364K r-x-- /usr/lib/firefox/components/libpipnss.so
b11c5000 16K rw--- /usr/lib/firefox/components/libpipnss.so
b1212000 8K r-x-- /lib/libnss_mdns4_minimal.so.2
b1214000 4K rw--- /lib/libnss_mdns4_minimal.so.2
b122f000 204K r-x-- /usr/lib/firefox/components/libmork.so
b1262000 12K rw--- /usr/lib/firefox/components/libmork.so
b2a68000 348K r-x-- /usr/lib/firefox/components/libstoragecomps.so
b2abf000 8K rw--- /usr/lib/firefox/components/libstoragecomps.so
b2c14000 364K r-x-- /usr/lib/libbonoboui-2.so.0.0.0
b2c6f000 12K rw--- /usr/lib/libbonoboui-2.so.0.0.0
b2c72000 552K r-x-- /usr/lib/libgnomeui-2.so.0.1788.4
b2cfc000 16K rw--- /usr/lib/libgnomeui-2.so.0.1788.4
b2e04000 48K r-x-- /usr/lib/libgnome-keyring.so.0.0.1
b2e10000 4K rw--- /usr/lib/libgnome-keyring.so.0.0.1
b2e11000 80K r-x-- /usr/lib/libart_lgpl_2.so.2.3.17
b2e25000 4K rw--- /usr/lib/libart_lgpl_2.so.2.3.17
b2e26000 164K r-x-- /usr/lib/libgnomecanvas-2.so.0.1400.0
b2e4f000 4K rw--- /usr/lib/libgnomecanvas-2.so.0.1400.0
b2e54000 16K r-x-- /lib/tls/i686/cmov/libnss_dns-2.5.so
b2e58000 8K rw--- /lib/tls/i686/cmov/libnss_dns-2.5.so
b2e5a000 16K r-x-- /usr/lib/firefox/components/libmozgnome.so
b2e5e000 4K rw--- /usr/lib/firefox/components/libmozgnome.so
b2e5f000 40K r-x-- /usr/lib/firefox/components/libnecko2.so
b2e69000 4K rw--- /usr/lib/firefox/components/libnecko2.so
b2e6a000 28K r-x-- /usr/lib/firefox/components/libimgicon.so
b2e71000 4K rw--- /usr/lib/firefox/components/libimgicon.so
b2e72000 76K r-x-- /usr/lib/firefox/components/libcomposer.so
b2e85000 8K rw--- /usr/lib/firefox/components/libcomposer.so
b2e87000 64K r-x-- /usr/lib/firefox/components/libspellchecker.so
b2e97000 4K rw--- /usr/lib/firefox/components/libspellchecker.so
b2e98000 20K r-x-- /usr/lib/firefox/components/libtxmgr.so
b2e9d000 4K rw--- /usr/lib/firefox/components/libtxmgr.so
b2e9e000 616K r-x-- /usr/lib/firefox/components/libeditor.so
b2f38000 16K rw--- /usr/lib/firefox/components/libeditor.so
b34b8000 84K r-x-- /usr/lib/libXmu.so.6.2.0
b34cd000 4K rw--- /usr/lib/libXmu.so.6.2.0
b35b3000 16K r-x-- /usr/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-png.so
b35b7000 4K rw--- /usr/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-png.so
b35bd000 236K r-x-- /home/edumazet/Desktop/jre1.5.0_07/lib/i386/libjavaplugin_nscp.so
b35f8000 28K rw--- /home/edumazet/Desktop/jre1.5.0_07/lib/i386/libjavaplugin_nscp.so
b35ff000 116K r-x-- /home/edumazet/Desktop/jre1.5.0_07/plugin/i386/ns7/libjavaplugin_oji.so
b361c000 20K rw--- /home/edumazet/Desktop/jre1.5.0_07/plugin/i386/ns7/libjavaplugin_oji.so
b3621000 68K r-x-- /usr/lib/totem/libtotem-narrowspace-plugin.so
b3632000 4K rw--- /usr/lib/totem/libtotem-narrowspace-plugin.so
b36ac000 44K r-x-- /usr/lib/totem/libtotem-mully-plugin.so
b36b7000 4K rw--- /usr/lib/totem/libtotem-mully-plugin.so
b36b8000 76K r-x-- /usr/lib/totem/libtotem-gmp-plugin.so
b36cb000 4K rw--- /usr/lib/totem/libtotem-gmp-plugin.so
b36cc000 28K r-x-- /usr/lib/libfam.so.0.0.0
b36d3000 4K rw--- /usr/lib/libfam.so.0.0.0
b36d4000 24K r-x-- /lib/libacl.so.1.1.0
b36da000 4K rw--- /lib/libacl.so.1.1.0
b36db000 12K r-x-- /lib/libattr.so.1.1.0
b36de000 4K rw--- /lib/libattr.so.1.1.0
b36e2000 44K r-x-- /usr/lib/totem/libtotem-basic-plugin.so
b36ed000 4K rw--- /usr/lib/totem/libtotem-basic-plugin.so
b36f9000 48K r-x-- /usr/lib/gnome-vfs-2.0/modules/libfile.so
b3705000 4K rw--- /usr/lib/gnome-vfs-2.0/modules/libfile.so
b3706000 20K r-x-- /usr/lib/firefox/components/libnkgnomevfs.so
b370b000 4K rw--- /usr/lib/firefox/components/libnkgnomevfs.so
b3710000 8K r-x-- /usr/lib/firefox/plugins/libunixprintplugin.so
b3712000 4K rw--- /usr/lib/firefox/plugins/libunixprintplugin.so
b3713000 164K r-x-- /usr/lib/firefox/components/libgkplugin.so
b373c000 8K rw--- /usr/lib/firefox/components/libgkplugin.so
b4826000 356K r-x-- /usr/lib/firefox/components/libhtmlpars.so
b487f000 32K rw--- /usr/lib/firefox/components/libhtmlpars.so
b4887000 756K r-x-- /usr/lib/firefox/components/libuconv.so
b4944000 28K rw--- /usr/lib/firefox/components/libuconv.so
b4955000 88K r-x-- /usr/lib/firefox/libjsj.so
b496b000 4K rw--- /usr/lib/firefox/libjsj.so
b496c000 80K r-x-- /usr/lib/firefox/components/liboji.so
b4980000 4K rw--- /usr/lib/firefox/components/liboji.so
b4981000 28K r-x-- /usr/lib/firefox/components/libpipboot.so
b4988000 4K rw--- /usr/lib/firefox/components/libpipboot.so
b518a000 72K r-x-- /usr/lib/firefox/components/libwebbrwsr.so
b519c000 8K rw--- /usr/lib/firefox/components/libwebbrwsr.so
b519e000 216K r-x-- /lib/libsepol.so.1
b51d4000 4K rw--- /lib/libsepol.so.1
b51df000 12K r-x-- /usr/lib/libgpg-error.so.0.3.0
b51e2000 4K rw--- /usr/lib/libgpg-error.so.0.3.0
b51e3000 316K r-x-- /usr/lib/libgcrypt.so.11.2.2
b5232000 8K rw--- /usr/lib/libgcrypt.so.11.2.2
b5234000 80K r-x-- /usr/lib/libtasn1.so.3.0.6
b5248000 4K rw--- /usr/lib/libtasn1.so.3.0.6
b5249000 768K r-x-- /usr/lib/libasound.so.2.0.0
b5309000 20K rw--- /usr/lib/libasound.so.2.0.0
b530e000 16K r-x-- /usr/lib/libORBitCosNaming-2.so.0.1.0
b5312000 4K rw--- /usr/lib/libORBitCosNaming-2.so.0.1.0
b5313000 8K r-x-- /lib/tls/i686/cmov/libutil-2.5.so
b5315000 8K rw--- /lib/tls/i686/cmov/libutil-2.5.so
b5317000 80K r-x-- /lib/libselinux.so.1
b532b000 8K rw--- /lib/libselinux.so.1
b532d000 60K r-x-- /lib/tls/i686/cmov/libresolv-2.5.so
b533c000 8K rw--- /lib/tls/i686/cmov/libresolv-2.5.so
b5340000 56K r-x-- /usr/lib/libavahi-client.so.3.2.2
b534e000 4K rw--- /usr/lib/libavahi-client.so.3.2.2
b534f000 40K r-x-- /usr/lib/libavahi-common.so.3.4.3
b5359000 4K rw--- /usr/lib/libavahi-common.so.3.4.3
b535a000 424K r-x-- /usr/lib/libgnutls.so.13.0.9
b53c4000 24K rw--- /usr/lib/libgnutls.so.13.0.9
b53ca000 196K r-x-- /usr/lib/libdbus-1.so.3.2.0
b53fb000 4K rw--- /usr/lib/libdbus-1.so.3.2.0
b53fc000 104K r-x-- /usr/lib/libdbus-glib-1.so.2.1.0
b5416000 4K rw--- /usr/lib/libdbus-glib-1.so.2.1.0
b5417000 1116K r-x-- /usr/lib/libxml2.so.2.6.27
b552e000 24K rw--- /usr/lib/libxml2.so.2.6.27
b5534000 28K r-x-- /lib/libpopt.so.0.0.0
b553b000 4K rw--- /lib/libpopt.so.0.0.0
b553c000 128K r-x-- /usr/lib/libaudiofile.so.0.0.2
b555c000 8K rw--- /usr/lib/libaudiofile.so.0.0.2
b555e000 36K r-x-- /usr/lib/libesd.so.0.2.36
b5567000 4K rw--- /usr/lib/libesd.so.0.2.36
b5568000 76K r-x-- /usr/lib/libbonobo-activation.so.4.0.0
b557b000 8K rw--- /usr/lib/libbonobo-activation.so.4.0.0
b557d000 328K r-x-- /usr/lib/libbonobo-2.so.0.0.0
b55cf000 40K rw--- /usr/lib/libbonobo-2.so.0.0.0
b55d9000 344K r-x-- /usr/lib/libgnomevfs-2.so.0.1800.1
b562f000 12K rw--- /usr/lib/libgnomevfs-2.so.0.1800.1
b5632000 80K r-x-- /usr/lib/libgnome-2.so.0.1800.0
b5646000 4K rw--- /usr/lib/libgnome-2.so.0.1800.0
b56a7000 68K r-x-- /usr/lib/libXft.so.2.1.2
b56b8000 4K rw--- /usr/lib/libXft.so.2.1.2
b56ba000 12K r-x-- /usr/lib/firefox/components/libremoteservice.so
b56bd000 4K rw--- /usr/lib/firefox/components/libremoteservice.so
b56be000 32K r-x-- /usr/lib/firefox/components/libcookie.so
b56c6000 4K rw--- /usr/lib/firefox/components/libcookie.so
b56c7000 12K r-x-- /usr/lib/firefox/components/libpermissions.so
b56ca000 4K rw--- /usr/lib/firefox/components/libpermissions.so
b56d3000 228K r-x-- /usr/lib/firefox/components/libgfx_gtk.so
b570c000 12K rw--- /usr/lib/firefox/components/libgfx_gtk.so
b570f000 120K r-x-- /usr/lib/libjpeg.so.62.0.0
b572d000 4K rw--- /usr/lib/libjpeg.so.62.0.0
b572f000 8K r-x-- /usr/lib/libavahi-glib.so.1.0.1
b5731000 4K rw--- /usr/lib/libavahi-glib.so.1.0.1
b5732000 24K r-x-- /usr/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-xpm.so
b5738000 4K rw--- /usr/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-xpm.so
b5739000 8K r-x-- /usr/lib/firefox/libgfxpsshar.so
b573b000 4K rw--- /usr/lib/firefox/libgfxpsshar.so
b573c000 24K r-x-- /usr/lib/libpangoxft-1.0.so.0.1600.2
b5742000 4K rw--- /usr/lib/libpangoxft-1.0.so.0.1600.2
b5743000 16K r-x-- /usr/lib/firefox/components/libcommandlines.so
b5747000 4K rw--- /usr/lib/firefox/components/libcommandlines.so
b5748000 5376K r-x-- /usr/lib/firefox/components/libgklayout.so
b5c88000 384K rw--- /usr/lib/firefox/components/libgklayout.so
b5cef000 28K r-x-- /lib/tls/i686/cmov/librt-2.5.so
b5cf6000 8K rw--- /lib/tls/i686/cmov/librt-2.5.so
b5cf8000 16K r-x-- /usr/lib/libgthread-2.0.so.0.1200.11
b5cfc000 4K rw--- /usr/lib/libgthread-2.0.so.0.1200.11
b5cfd000 292K r-x-- /usr/lib/libORBit-2.so.0.1.0
b5d46000 40K rw--- /usr/lib/libORBit-2.so.0.1.0
b5d50000 188K r-x-- /usr/lib/libgconf-2.so.4.1.2
b5d7f000 12K rw--- /usr/lib/libgconf-2.so.4.1.2
b5d82000 96K r-x-- /usr/lib/firefox/components/libimglib2.so
b5d9a000 8K rw--- /usr/lib/firefox/components/libimglib2.so
b5d9c000 88K r-x-- /usr/lib/firefox/components/libnsappshell.so
b5db2000 8K rw--- /usr/lib/firefox/components/libnsappshell.so
b5db4000 80K r-x-- /usr/lib/firefox/components/libappcomps.so
b5dc8000 4K rw--- /usr/lib/firefox/components/libappcomps.so
b5dc9000 308K r-x-- /usr/lib/firefox/components/libdocshell.so
b5e16000 16K rw--- /usr/lib/firefox/components/libdocshell.so
b5e1a000 76K r-x-- /usr/lib/firefox/components/libjsd.so
b5e2d000 4K rw--- /usr/lib/firefox/components/libjsd.so
b5e2e000 156K r-x-- /usr/lib/firefox/components/librdf.so
b5e55000 8K rw--- /usr/lib/firefox/components/librdf.so
b6658000 172K r-x-- /usr/lib/firefox/components/libembedcomponents.so
b6683000 8K rw--- /usr/lib/firefox/components/libembedcomponents.so
b6685000 280K r-x-- /usr/lib/firefox/components/libtoolkitcomps.so
b66cb000 12K rw--- /usr/lib/firefox/components/libtoolkitcomps.so
b6709000 72K r-x-- /usr/lib/gtk-2.0/2.10.0/engines/libubuntulooks.so
b671b000 4K rw--- /usr/lib/gtk-2.0/2.10.0/engines/libubuntulooks.so
b673c000 84K r-x-- /usr/lib/libICE.so.6.3.0
b6751000 8K rw--- /usr/lib/libICE.so.6.3.0
b6754000 32K r-x-- /usr/lib/libSM.so.6.0.0
b675c000 4K rw--- /usr/lib/libSM.so.6.0.0
b675d000 308K r-x-- /usr/lib/libXt.so.6.0.0
b67aa000 16K rw--- /usr/lib/libXt.so.6.0.0
b67ae000 20K r-x-- /usr/lib/firefox/components/libsystem-pref.so
b67b3000 4K rw--- /usr/lib/firefox/components/libsystem-pref.so
b67b4000 76K r-x-- /usr/lib/firefox/components/libcaps.so
b67c7000 4K rw--- /usr/lib/firefox/components/libcaps.so
b67c8000 12K r-x-- /usr/lib/firefox/libgtkxtbin.so
b67cb000 4K rw--- /usr/lib/firefox/libgtkxtbin.so
b67cc000 176K r-x-- /usr/lib/firefox/components/libwidget_gtk2.so
b67f8000 16K rw--- /usr/lib/firefox/components/libwidget_gtk2.so
b67fc000 68K r-x-- /usr/lib/firefox/components/libjar50.so
b680d000 8K rw--- /usr/lib/firefox/components/libjar50.so
b680f000 304K r-x-- /usr/lib/firefox/components/libxpconnect.so
b685b000 16K rw--- /usr/lib/firefox/components/libxpconnect.so
b7060000 100K r-x-- /usr/lib/firefox/libxpcom_compat.so
b7079000 4K rw--- /usr/lib/firefox/libxpcom_compat.so
b707b000 116K r-x-- /usr/lib/firefox/libgkgfx.so
b7098000 8K rw--- /usr/lib/firefox/libgkgfx.so
b709a000 232K r-x-- /usr/lib/firefox/components/libbrowsercomps.so
b70d4000 12K rw--- /usr/lib/firefox/components/libbrowsercomps.so
b70d7000 216K r-x-- /usr/lib/firefox/components/libi18n.so
b710d000 12K rw--- /usr/lib/firefox/components/libi18n.so
b7110000 776K r-x-- /usr/lib/firefox/components/libnecko.so
b71d2000 32K rw--- /usr/lib/firefox/components/libnecko.so
b71da000 160K r-x-- /usr/lib/libhunspell-1.1.so.0.0.0
b7202000 68K rw--- /usr/lib/libhunspell-1.1.so.0.0.0
b7214000 28K r-x-- /usr/lib/firefox/components/libautoconfig.so
b721b000 4K rw--- /usr/lib/firefox/components/libautoconfig.so
b721c000 64K r-x-- /usr/lib/firefox/components/libchrome.so
b722c000 4K rw--- /usr/lib/firefox/components/libchrome.so
b7250000 36K r-x-- /lib/tls/i686/cmov/libnss_files-2.5.so
b7259000 8K rw--- /lib/tls/i686/cmov/libnss_files-2.5.so
b725b000 32K r-x-- /lib/tls/i686/cmov/libnss_nis-2.5.so
b7263000 8K rw--- /lib/tls/i686/cmov/libnss_nis-2.5.so
b7265000 76K r-x-- /lib/tls/i686/cmov/libnsl-2.5.so
b7278000 8K rw--- /lib/tls/i686/cmov/libnsl-2.5.so
b727c000 28K r-x-- /lib/tls/i686/cmov/libnss_compat-2.5.so
b7283000 8K rw--- /lib/tls/i686/cmov/libnss_compat-2.5.so
b7286000 60K r-x-- /usr/lib/firefox/components/libpref.so
b7295000 4K rw--- /usr/lib/firefox/components/libpref.so
b7296000 16K r-x-- /usr/lib/firefox/components/libmyspell.so
b729a000 4K rw--- /usr/lib/firefox/components/libmyspell.so
b729b000 12K r-x-- /usr/lib/firefox/components/libbrowserdirprovider.so
b729e000 4K rw--- /usr/lib/firefox/components/libbrowserdirprovider.so
b73c6000 120K r-x-- /usr/lib/libexpat.so.1.0.0
b73e4000 8K rw--- /usr/lib/libexpat.so.1.0.0
b73e6000 136K r-x-- /usr/lib/libpng12.so.0.15.0
b7408000 4K rw--- /usr/lib/libpng12.so.0.15.0
b7409000 76K r-x-- /usr/lib/libz.so.1.2.3
b741c000 4K rw--- /usr/lib/libz.so.1.2.3
b741e000 416K r-x-- /usr/lib/libfreetype.so.6.3.10
b7486000 12K rw--- /usr/lib/libfreetype.so.6.3.10
b7489000 168K r-x-- /usr/lib/libpangoft2-1.0.so.0.1600.2
b74b3000 4K rw--- /usr/lib/libpangoft2-1.0.so.0.1600.2
b74b4000 16K r-x-- /usr/lib/libXdmcp.so.6.0.0
b74b8000 4K rw--- /usr/lib/libXdmcp.so.6.0.0
b74b9000 8K r-x-- /usr/lib/libXau.so.6.0.0
b74bb000 4K rw--- /usr/lib/libXau.so.6.0.0
b74bc000 32K r-x-- /usr/lib/libXcursor.so.1.0.2
b74c4000 4K rw--- /usr/lib/libXcursor.so.1.0.2
b74c6000 20K r-x-- /usr/lib/libXrandr.so.2.1.0
b74cb000 4K rw--- /usr/lib/libXrandr.so.2.1.0
b74cc000 28K r-x-- /usr/lib/libXi.so.6.0.0
b74d3000 4K rw--- /usr/lib/libXi.so.6.0.0
b74d4000 8K r-x-- /usr/lib/libXinerama.so.1.0.0
b74d6000 4K rw--- /usr/lib/libXinerama.so.1.0.0
b74d7000 28K r-x-- /usr/lib/libXrender.so.1.3.0
b74de000 4K rw--- /usr/lib/libXrender.so.1.3.0
b74df000 52K r-x-- /usr/lib/libXext.so.6.4.0
b74ec000 4K rw--- /usr/lib/libXext.so.6.4.0
b74ed000 140K r-x-- /usr/lib/libfontconfig.so.1.2.0
b7510000 32K rw--- /usr/lib/libfontconfig.so.1.2.0
b7519000 440K r-x-- /usr/lib/libcairo.so.2.11.1
b7587000 8K rw--- /usr/lib/libcairo.so.2.11.1
b7589000 592K r-x-- /usr/lib/libglib-2.0.so.0.1200.11
b761d000 4K rw--- /usr/lib/libglib-2.0.so.0.1200.11
b761e000 8K r-x-- /usr/lib/libgmodule-2.0.so.0.1200.11
b7620000 4K rw--- /usr/lib/libgmodule-2.0.so.0.1200.11
b7621000 228K r-x-- /usr/lib/libgobject-2.0.so.0.1200.11
b765a000 4K rw--- /usr/lib/libgobject-2.0.so.0.1200.11
b765b000 100K r-x-- /usr/lib/libatk-1.0.so.0.1809.1
b7674000 8K rw--- /usr/lib/libatk-1.0.so.0.1809.1
b7677000 16K r-x-- /usr/lib/libXfixes.so.3.1.0
b767b000 4K rw--- /usr/lib/libXfixes.so.3.1.0
b767c000 240K r-x-- /usr/lib/libpango-1.0.so.0.1600.2
b76b8000 8K rw--- /usr/lib/libpango-1.0.so.0.1600.2
b76ba000 28K r-x-- /usr/lib/libpangocairo-1.0.so.0.1600.2
b76c1000 4K rw--- /usr/lib/libpangocairo-1.0.so.0.1600.2
b76c2000 88K r-x-- /usr/lib/libgdk_pixbuf-2.0.so.0.1000.11
b76d8000 4K rw--- /usr/lib/libgdk_pixbuf-2.0.so.0.1000.11
b76d9000 44K r-x-- /lib/libgcc_s.so.1
b76e4000 4K rw--- /lib/libgcc_s.so.1
b76e6000 8K r-x-- /lib/tls/i686/cmov/libdl-2.5.so
b76e8000 8K rw--- /lib/tls/i686/cmov/libdl-2.5.so
b76ea000 8K r-x-- /usr/lib/libplds4.so
b76ec000 4K rw--- /usr/lib/libplds4.so
b76ed000 148K r-x-- /lib/tls/i686/cmov/libm-2.5.so
b7712000 8K rw--- /lib/tls/i686/cmov/libm-2.5.so
b7714000 1260K r-x-- /lib/tls/i686/cmov/libc-2.5.so
b784f000 4K r---- /lib/tls/i686/cmov/libc-2.5.so
b7850000 8K rw--- /lib/tls/i686/cmov/libc-2.5.so
b7855000 892K r-x-- /usr/lib/libstdc++.so.6.0.8
b7934000 12K r---- /usr/lib/libstdc++.so.6.0.8
b7937000 8K rw--- /usr/lib/libstdc++.so.6.0.8
b793f000 948K r-x-- /usr/lib/libX11.so.6.2.0
b7a2c000 16K rw--- /usr/lib/libX11.so.6.2.0
b7a31000 524K r-x-- /usr/lib/libgdk-x11-2.0.so.0.1000.11
b7ab4000 12K rw--- /usr/lib/libgdk-x11-2.0.so.0.1000.11
b7ab7000 3396K r-x-- /usr/lib/libgtk-x11-2.0.so.0.1000.11
b7e08000 24K rw--- /usr/lib/libgtk-x11-2.0.so.0.1000.11
b7e0f000 76K r-x-- /lib/tls/i686/cmov/libpthread-2.5.so
b7e22000 8K rw--- /lib/tls/i686/cmov/libpthread-2.5.so
b7e26000 188K r-x-- /usr/lib/libnspr4.so
b7e55000 4K rw--- /usr/lib/libnspr4.so
b7e58000 16K r-x-- /usr/lib/libplc4.so
b7e5c000 4K rw--- /usr/lib/libplc4.so
b7e5d000 4K r-x-- /usr/lib/gtk-2.0/2.10.0/immodules/im-cedilla.so
b7e5e000 4K rw--- /usr/lib/gtk-2.0/2.10.0/immodules/im-cedilla.so
b7e5f000 8K r-x-- /usr/lib/gconv/UTF-16.so
b7e61000 8K rw--- /usr/lib/gconv/UTF-16.so
b7e63000 4K r-x-- /usr/lib/gconv/ISO8859-1.so
b7e64000 8K rw--- /usr/lib/gconv/ISO8859-1.so
b7e77000 656K r-x-- /usr/lib/firefox/libxpcom_core.so
b7f1b000 32K rw--- /usr/lib/firefox/libxpcom_core.so
b7f24000 8K r-x-- /usr/lib/firefox/libxpcom.so
b7f26000 4K rw--- /usr/lib/firefox/libxpcom.so
b7f27000 668K r-x-- /usr/lib/firefox/libmozjs.so
b7fce000 20K rw--- /usr/lib/firefox/libmozjs.so
b7fd5000 100K r-x-- /lib/ld-2.5.so
b7fee000 8K rw--- /lib/ld-2.5.so
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Big reserved mappings on x86_64
2007-04-25 9:30 ` Eric Dumazet
@ 2007-04-25 9:59 ` Jan Engelhardt
0 siblings, 0 replies; 4+ messages in thread
From: Jan Engelhardt @ 2007-04-25 9:59 UTC (permalink / raw)
To: Eric Dumazet; +Cc: Jakub Jelinek, Linux Kernel Mailing List
On Apr 25 2007 11:30, Eric Dumazet wrote:
>Jakub Jelinek <jakub@redhat.com> wrote:
>
>> On Wed, Apr 25, 2007 at 10:42:20AM +0200, Jan Engelhardt wrote:
>> > I actually took a look at `pmap $$`, which reveals that a lot of shared
>> > libraries map 2044K or 2048K unreadable-unwritable-private
>> > mappings...for _what_ purpose?
>> >
>> > 10:37 opteron:~ > pmap $$
>> > 4403: bash
>> > START SIZE RSS DIRTY PERM MAPPING
>> > 2ae6cca70000 212K 172K 0K r-xp /lib64/libreadline.so.5.2
>> > 2ae6ccaa5000 2044K 0K 0K ---p /lib64/libreadline.so.5.2 <--
>> > 2ae6ccca4000 4K 4K 4K r--p /lib64/libreadline.so.5.2
>> > 2ae6ccca5000 28K 28K 28K rw-p /lib64/libreadline.so.5.2
>> > 2ae6cccac000 8K 8K 8K rw-p [anon]
>> > 2ae6cccae000 28K 16K 0K r-xp /lib64/libhistory.so.5.2
>> > 2ae6cccb5000 2048K 0K 0K ---p /lib64/libhistory.so.5.2 <--
>> > 2ae6cceb5000 8K 8K 8K rw-p /lib64/libhistory.so.5.2
>> > 2ae6cceb7000 320K 208K 0K r-xp /lib64/libncurses.so.5.5
>> > 2ae6ccf07000 2048K 0K 0K ---p /lib64/libncurses.so.5.5 <--
>> > 2ae6cd107000 48K 48K 48K r--p /lib64/libncurses.so.5.5
>> > 2ae6cd113000 28K 28K 28K rw-p /lib64/libncurses.so.5.5
>> > [...]
>> >
>> > What could these ominous mappings be? Does anyone else see that -
>> > perhaps someone with x86_64 && !(opensuse 10.2)?
>>
>> While i386 only supports 4KB pages, x86_64 ELF objects ought to support
>> up to 2MB pages. The gap between read-only/executable and writable segments
>> is intentionally mapped PROT_NONE, so that other things aren't mapped in
>> between the segments.
>
>This makes sense for catching some programming errors, but it also
>has a cost for innocent users, since it adds one vm_area_struct per
>dll. It slows down all find_vma() operations that tend to be done
>quite frequently these days :( Even with a rbtree, adding 150
>vm_area_struct increase memory needs and cache misses. Maybe these
>PROT_NONE mappings could be done iff some LD_DEBUG or other ld.so
>variable says so ?
And even then, there should probably be one or two variables inside
the vma struct that defines a "padding" the must come before/after a
specific vma. I think that would get rid of these PROT_NONE vmas
while catching errors. Hey btw, are there any architectures that do
_not_ actually implement a read/write check? Having no vma mapped at
all might catch a bogus read/write attempt earlier than a prot_none
vma, does not it?
>BTW I dont see such mappings on my 32bit distro (Ubuntu 7.04, glibc-2.5)
It seems specific to x86_64. sparc64 looks like this:
f7d34000 1376K r-x-- /lib/libc-2.5.so
f7e8c000 56K ----- /lib/libc-2.5.so <-
f7e9a000 8K r---- /lib/libc-2.5.so
f7e9c000 16K rwx-- /lib/libc-2.5.so
f7ea0000 8K rwx-- [ anon ]
f7ea4000 16K r-x-- /lib/libdl-2.5.so
f7ea8000 56K ----- /lib/libdl-2.5.so <-
f7eb6000 8K r---- /lib/libdl-2.5.so
f7eb8000 8K rwx-- /lib/libdl-2.5.so
f7ebc000 16K r-x-- /lib/libtermcap.so.2.0.8
f7ec0000 56K ----- /lib/libtermcap.so.2.0.8 <-
f7ece000 8K rwx-- /lib/libtermcap.so.2.0.8
Jan
--
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2007-04-25 10:01 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2007-04-25 8:42 Big reserved mappings on x86_64 Jan Engelhardt
2007-04-25 8:49 ` Jakub Jelinek
2007-04-25 9:30 ` Eric Dumazet
2007-04-25 9:59 ` Jan Engelhardt
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