Commits started from ("rcu: Tighten up __call_rcu() rcu_head alignment check") and ended in ("rcutorture: Invoke call_rcu() from timer handler")
Signed-off-by: Yousef Algadri <yusufgadrie@gmail.com>
Signed-off-by: TsingPeng <tsingpeng@foxmail.com>
Signed-off-by: Sorayukii <sorayukii69@gmail.com>
Yousef Algadriauthored and Sorayukiicommited 2026-05-15 17:49:30 +07:00
This is a backport from Linux 5.2-rc1 of a patch series to greatly enhance vmalloc's performance
especially on embedded systems, plus all of its dependencies that were missing in kernel 4.9.
For all the informations, refer to LKML: https://lkml.org/lkml/2018/10/19/786
Brief informations:
Currently an allocation of the new VA area is done over busy list iteration until a suitable hole
is found between two busy areas. Therefore each new allocation causes the list being grown.
Due to long list and different permissive parameters an allocation can take a long time on
embedded devices(milliseconds).
This patch organizes the vmalloc memory layout into free areas of the VMALLOC_START-VMALLOC_END range.
It uses a red-black tree that keeps blocks sorted by their offsets in pair with linked list
keeping the free space in order of increasing addresses.
Quote Phoronix:
With this patch from Uladzislau Rezki, calling vmalloc() can take up to 67% less time compared
to the behavior on Linux 5.1 and prior, at least with tests done by the developer under QEMU.
Personal tests are showing that the device is more responsive when memory pressure is
high and when huge allocations are to be done, it's also noticeably faster in this case, like
when starting Chrome with more than 100 opened tabs after a system reboot (so, an
uncached complete load of it).
Shameless kanged from:
https://github.com/sonyxperiadev/kernel / Pull Request 2016
Signed-off-by: sweetyicecare <gabrielseedev@outlook.com>
Signed-off-by: Aoihara <veronicadisa6@gmail.com>
Signed-off-by: KangMamles <imzea69@gmail.com>
Signed-off-by: Sorayukii <sorayukii69@gmail.com>
Angelo G. Del Regnoauthored and Sorayukiicommited 2026-05-15 17:48:25 +07:00
Document some things of note to gcov users:
1. GCC gcov and Clang llvm-cov tools are not compatible.
2. The use of GCC vs Clang is transparent at build-time.
Also adjust the documentation to account for the removal of config symbol
CONFIG_GCOV_FORMAT_AUTODETECT by commit 6a61b70b43c9 ("gcov: remove
CONFIG_GCOV_FORMAT_AUTODETECT").
Link: http://lkml.kernel.org/r/20190318025411.98014-4-trong@android.com
Signed-off-by: Tri Vo <trong@android.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Cc: Daniel Mentz <danielmentz@google.com>
Cc: Greg Hackmann <ghackmann@android.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Petri Gynther <pgynther@google.com>
Cc: Prasad Sodagudi <psodagud@quicinc.com>
Cc: Trilok Soni <tsoni@quicinc.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
(cherry picked from commit aa069a23a220e9ab00d6837b76917952d0fb587e)
Bug: 132997968
Test: defconfig + CONFIG_GCOV_KERNEL records coverage
Change-Id: Id9a248d5e6d8fc643300230b2ab2ce902050a6ae
Some of the kmemleak_*() callbacks in memblock, bootmem, CMA convert a
physical address to a virtual one using __va(). However, such physical
addresses may sometimes be located in highmem and using __va() is
incorrect, leading to inconsistent object tracking in kmemleak.
The following functions have been added to the kmemleak API and they take
a physical address as the object pointer. They only perform the
corresponding action if the address has a lowmem mapping:
kmemleak_alloc_phys
kmemleak_free_part_phys
kmemleak_not_leak_phys
kmemleak_ignore_phys
The affected calling places have been updated to use the new kmemleak
API.
Link: http://lkml.kernel.org/r/1471531432-16503-1-git-send-email-catalin.marinas@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: Vignesh R <vigneshr@ti.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Catalin Marinasauthored and Linus Torvaldscommited 2016-10-11 15:06:33 -07:00
Fold the sparse document into the development tools set; no changes to the
text itself beyond formatting.
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Jonathan Corbetcommited 2016-08-18 17:39:24 -06:00
No textual changes have been made, but the formatting has obviously been
tweaked.
Cc: Michal Marek <mmarek@suse.com>
Cc: Gilles Muller <Gilles.Muller@lip6.fr>
Acked-by: Nicolas Palix <nicolas.palix@imag.fr>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Jonathan Corbetcommited 2016-08-18 17:32:11 -06:00
This directory will be a collecting point for documentation oriented around
development tools. As a step toward ordering Documentation/ it's a small
one, but we have to start somewhere...
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Jonathan Corbetcommited 2016-08-18 17:31:51 -06:00
Yousef Algadri
authored and
Sorayukii
commited 
Angelo G. Del Regno
authored and
Tri Vo
commited 
Catalin Marinas
authored and
Linus Torvalds
commited 
Jonathan Corbet
commited