summaryrefslogtreecommitdiffstats
path: root/documentation/overview-manual/yp-intro.rst
diff options
context:
space:
mode:
Diffstat (limited to 'documentation/overview-manual/yp-intro.rst')
-rw-r--r--documentation/overview-manual/yp-intro.rst33
1 files changed, 0 insertions, 33 deletions
diff --git a/documentation/overview-manual/yp-intro.rst b/documentation/overview-manual/yp-intro.rst
index ce2aed519e..a863a7d16e 100644
--- a/documentation/overview-manual/yp-intro.rst
+++ b/documentation/overview-manual/yp-intro.rst
@@ -387,39 +387,6 @@ Yocto Project:
387 You can learn more about the AutoBuilder used by the Yocto Project 387 You can learn more about the AutoBuilder used by the Yocto Project
388 Autobuilder :doc:`here </test-manual/understand-autobuilder>`. 388 Autobuilder :doc:`here </test-manual/understand-autobuilder>`.
389 389
390- *Cross-Prelink:* Prelinking is the process of pre-computing the load
391 addresses and link tables generated by the dynamic linker as compared
392 to doing this at runtime. Doing this ahead of time results in
393 performance improvements when the application is launched and reduced
394 memory usage for libraries shared by many applications.
395
396 Historically, cross-prelink is a variant of prelink, which was
397 conceived by `Jakub
398 JelĂ­nek <https://people.redhat.com/jakub/prelink.pdf>`__ a number of
399 years ago. Both prelink and cross-prelink are maintained in the same
400 repository albeit on separate branches. By providing an emulated
401 runtime dynamic linker (i.e. ``glibc``-derived ``ld.so`` emulation),
402 the cross-prelink project extends the prelink software's ability to
403 prelink a sysroot environment. Additionally, the cross-prelink
404 software enables the ability to work in sysroot style environments.
405
406 The dynamic linker determines standard load address calculations
407 based on a variety of factors such as mapping addresses, library
408 usage, and library function conflicts. The prelink tool uses this
409 information, from the dynamic linker, to determine unique load
410 addresses for executable and linkable format (ELF) binaries that are
411 shared libraries and dynamically linked. The prelink tool modifies
412 these ELF binaries with the pre-computed information. The result is
413 faster loading and often lower memory consumption because more of the
414 library code can be re-used from shared Copy-On-Write (COW) pages.
415
416 The original upstream prelink project only supports running prelink
417 on the end target device due to the reliance on the target device's
418 dynamic linker. This restriction causes issues when developing a
419 cross-compiled system. The cross-prelink adds a synthesized dynamic
420 loader that runs on the host, thus permitting cross-prelinking
421 without ever having to run on a read-write target filesystem.
422
423- *Pseudo:* Pseudo is the Yocto Project implementation of 390- *Pseudo:* Pseudo is the Yocto Project implementation of
424 `fakeroot <http://man.he.net/man1/fakeroot>`__, which is used to run 391 `fakeroot <http://man.he.net/man1/fakeroot>`__, which is used to run
425 commands in an environment that seemingly has root privileges. 392 commands in an environment that seemingly has root privileges.