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Full Discussion: Linux Page Sharing
Top Forums UNIX for Advanced & Expert Users Linux Page Sharing Post 302556515 by kumaran_5555 on Monday 19th of September 2011 02:47:33 AM
Old 09-19-2011
Quote:
Originally Posted by Corona688
No merging is necessary to share program text -- program text is 100% shared already, because it's loaded with memory mapping.

It's easy to share file-backed memory maps because they're not anonymous. No contents need to be checked, just locations. Map the same location, get the same pages.
Thanks for all your input. Can anyone explain me little about how program text sharing happens in Linux while loading the program.

Code:
42416000    1568     572       0 r-x--  libc-2.13.90.so
4259e000       8       8       4 r----  libc-2.13.90.so
425a0000       4       4       4 rw---  libc-2.13.90.so

This is what I found in pmap of bash process, suppose if another bash process is started will these areas will be shared, how they are shared while new bash is created. (is there any info that kernel keeps to know that these files are loaded at these parts)

Please show me some light in this area.
 

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PLDD(1) 							 Linux User Manual							   PLDD(1)

NAME
pldd - display dynamic shared objects linked into a process SYNOPSIS
pldd pid pldd option DESCRIPTION
The pldd command displays a list of the dynamic shared objects that are linked into the process with the specified process ID. The list includes the libraries that have been dynamically loaded using dlopen(3). OPTIONS
-?, --help Display program help message. --usage Display a short usage message. -V, --version Display the program version. EXIT STATUS
On success, pldd exits with the status 0. If the specified process does not exist, the user does not have permission to access its dynamic shared object list, or no command-line arguments are supplied, pldd exists with a status of 1. If given an invalid option, it exits with the status 64. VERSIONS
pldd is available since glibc 2.15. CONFORMING TO
The pldd command is not specified by POSIX.1. Some other systems have a similar command. NOTES
The command lsof -p PID also shows output that includes the dynamic shared objects that are linked into a process. The gdb(1) info shared command also shows the shared libraries being used by a process, so that one can obtain similar output to pldd using a command such as the following (to monitor the process with the specified pid): $ gdb -ex "set confirm off" -ex "set height 0" -ex "info shared" -ex "quit" -p $pid | grep '^0x.*0x' BUGS
Since glibc 2.19, pldd is broken: it just hangs when executed. It is unclear if it will ever be fixed. EXAMPLE
$ echo $$ # Display PID of shell 1143 $ pldd $$ # Display DSOs linked into the shell 1143: /usr/bin/bash linux-vdso.so.1 /lib64/libtinfo.so.5 /lib64/libdl.so.2 /lib64/libc.so.6 /lib64/ld-linux-x86-64.so.2 /lib64/libnss_files.so.2 SEE ALSO
ldd(1), lsof(1), dlopen(3), ld.so(8) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. GNU
2017-09-15 PLDD(1)
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