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Filename Latest commit message Latest commit date
Kalesh Singh 6ad75e7a9d ANDROID: 16K: Exclude ELF padding for fault around range 
Userspace apps often analyze memory consumption by the use of mm
rss_stat counters -- via the kmem/rss_stat trace event or from
/proc/<pid>/statm.

rss_stat counters are only updated when the PTEs are updated. What this
means is that pages can be present in the page cache from readahead but
not visible to userspace (not attributed to the app) as there is no
corresponding VMA (PTEs) for the respective page cache pages.

A side effect of the loader now extending ELF LOAD segments to be
contiguously mapped in the virtual address space, means that the VMA is
extended to cover the padding pages.

When filesystems, such as f2fs and ext4, that implement
vm_ops->map_pages() attempt to perform a do_fault_around() the extent of
the fault around is restricted by the area of the enclosing VMA. Since
the loader extends LOAD segment VMAs to be contiguously mapped, the extent
of the fault around is also increased. The result of which, is that the
PTEs corresponding to the padding pages are updated and reflected in the
rss_stat counters.

It is not common that userspace application developers be aware of this
nuance in the kernel's memory accounting. To avoid apparent regressions
in memory usage to userspace, restrict the fault around range to only
valid data pages (i.e. exclude the padding pages at the end of the VMA).

Bug: 330117029
Bug: 327600007
Bug: 330767927
Bug: 328266487
Bug: 329803029
Change-Id: I2c7a39ec1b040be2b9fb47801f95042f5dbf869d
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
2024-05-02 15:02:52 -07:00
android ANDROID: GKI: add snd_compr_stop_error to Xiaomi_abi 2024-04-15 12:19:10 +00:00
arch This is the 5.4.268 stable release 2024-01-26 02:15:05 +00:00
block This is the 5.4.265 stable release 2023-12-21 12:17:30 +00:00
certs
crypto This is the 5.4.268 stable release 2024-01-26 02:15:05 +00:00
Documentation BACKPORT: f2fs: expose # of overprivision segments 2024-03-21 22:07:44 +00:00
drivers FROMLIST: binder: check offset alignment in binder_get_object() 2024-04-01 16:16:30 +00:00
fs Merge tag 'android11-5.4.268_r00' into android11-5.4 2024-03-27 18:12:26 +00:00
include ANDROID: 16K: Use MADV_DONTNEED to save VMA padding pages. 2024-05-02 15:02:50 -07:00
init This is the 5.4.268 stable release 2024-01-26 02:15:05 +00:00
ipc ipc/sem: Fix dangling sem_array access in semtimedop race 2022-12-08 11:23:06 +01:00
kernel Merge branch 'android11-5.4' into branch 'android11-5.4-lts' 2024-02-14 14:33:47 +00:00
lib UPSTREAM: ida: Fix crash in ida_free when the bitmap is empty 2024-02-01 11:03:13 +00:00
LICENSES
mm ANDROID: 16K: Exclude ELF padding for fault around range 2024-05-02 15:02:52 -07:00
net UPSTREAM: netfilter: nf_tables: release mutex after nft_gc_seq_end from abort path 2024-04-15 10:51:08 +00:00
samples This is the 5.4.251 stable release 2023-08-03 10:56:28 +00:00
scripts Merge tag 'android11-5.4.265_r00' into branch 'android11-5.4' 2024-01-09 13:26:54 +00:00
security This is the 5.4.268 stable release 2024-01-26 02:15:05 +00:00
sound Merge branch 'android11-5.4' into branch 'android11-5.4-lts' 2024-02-14 14:33:47 +00:00
tools This is the 5.4.268 stable release 2024-01-26 02:15:05 +00:00
usr
virt KVM: Destroy target device if coalesced MMIO unregistration fails 2023-03-11 16:44:01 +01:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
build.config.aarch64
build.config.allmodconfig
build.config.allmodconfig.aarch64
build.config.allmodconfig.arm
build.config.allmodconfig.x86_64
build.config.arm
build.config.common
build.config.db845c ANDROID: db845c: Enable device tree overlay support 2024-01-13 10:38:25 +05:30
build.config.gki
build.config.gki-debug.aarch64
build.config.gki-debug.x86_64
build.config.gki.aarch64
build.config.gki.x86_64
build.config.gki_kasan
build.config.gki_kasan.aarch64
build.config.gki_kasan.x86_64
build.config.gki_kprobes
build.config.gki_kprobes.aarch64
build.config.gki_kprobes.x86_64
build.config.hikey960
build.config.x86_64
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS This is the 5.4.255 stable release 2023-08-30 16:47:09 +00:00
Makefile This is the 5.4.268 stable release 2024-01-26 02:15:05 +00:00
OWNERS ANDROID: Use GKI Dr. No OWNERS file 2023-12-04 13:28:17 +00:00
README
README.md

README.md

How do I submit patches to Android Common Kernels

  1. BEST: Make all of your changes to upstream Linux. If appropriate, backport to the stable releases. These patches will be merged automatically in the corresponding common kernels. If the patch is already in upstream Linux, post a backport of the patch that conforms to the patch requirements below.

  2. LESS GOOD: Develop your patches out-of-tree (from an upstream Linux point-of-view). Unless these are fixing an Android-specific bug, these are very unlikely to be accepted unless they have been coordinated with kernel-team@android.com. If you want to proceed, post a patch that conforms to the patch requirements below.

Common Kernel patch requirements

  • All patches must conform to the Linux kernel coding standards and pass script/checkpatch.pl
  • Patches shall not break gki_defconfig or allmodconfig builds for arm, arm64, x86, x86_64 architectures (see https://source.android.com/setup/build/building-kernels)
  • If the patch is not merged from an upstream branch, the subject must be tagged with the type of patch: UPSTREAM:, BACKPORT:, FROMGIT:, FROMLIST:, or ANDROID:.
  • All patches must have a Change-Id: tag (see https://gerrit-review.googlesource.com/Documentation/user-changeid.html)
  • If an Android bug has been assigned, there must be a Bug: tag.
  • All patches must have a Signed-off-by: tag by the author and the submitter

Additional requirements are listed below based on patch type

Requirements for backports from mainline Linux: UPSTREAM:, BACKPORT:

  • If the patch is a cherry-pick from Linux mainline with no changes at all
    • tag the patch subject with UPSTREAM:.
    • add upstream commit information with a (cherry-picked from ...) line
    • Example:
      • if the upstream commit message is
        important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

    - then Joe Smith would upload the patch for the common kernel as

        UPSTREAM: important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

        Bug: 135791357
        Change-Id: I4caaaa566ea080fa148c5e768bb1a0b6f7201c01
        (cherry-picked from c31e73121f4c1ec41143423ac6ce3ce6dafdcec1)
        Signed-off-by: Joe Smith <joe.smith@foo.org>
  • If the patch requires any changes from the upstream version, tag the patch with BACKPORT: instead of UPSTREAM:.
    • use the same tags as UPSTREAM:
    • add comments about the changes under the (cherry-picked from ...) line
    • Example:
        BACKPORT: important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

        Bug: 135791357
        Change-Id: I4caaaa566ea080fa148c5e768bb1a0b6f7201c01
        (cherry-picked from c31e73121f4c1ec41143423ac6ce3ce6dafdcec1)
        [ Resolved minor conflict in drivers/foo/bar.c ]
        Signed-off-by: Joe Smith <joe.smith@foo.org>

Requirements for other backports: FROMGIT:, FROMLIST:,

  • If the patch has been merged into an upstream maintainer tree, but has not yet been merged into Linux mainline
    • tag the patch subject with FROMGIT:
    • add info on where the patch came from as (cherry picked from commit <sha1> <repo> <branch>). This must be a stable maintainer branch (not rebased, so don't use linux-next for example).
    • if changes were required, use BACKPORT: FROMGIT:
    • Example:
      • if the commit message in the maintainer tree is
        important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

    - then Joe Smith would upload the patch for the common kernel as

        FROMGIT: important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

        Bug: 135791357
        (cherry picked from commit 878a2fd9de10b03d11d2f622250285c7e63deace
         https://git.kernel.org/pub/scm/linux/kernel/git/foo/bar.git test-branch)
        Change-Id: I4caaaa566ea080fa148c5e768bb1a0b6f7201c01
        Signed-off-by: Joe Smith <joe.smith@foo.org>
  • If the patch has been submitted to LKML, but not accepted into any maintainer tree
    • tag the patch subject with FROMLIST:
    • add a Link: tag with a link to the submittal on lore.kernel.org
    • if changes were required, use BACKPORT: FROMLIST:
    • Example:
        FROMLIST: important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

        Bug: 135791357
        Link: https://lore.kernel.org/lkml/20190619171517.GA17557@someone.com/
        Change-Id: I4caaaa566ea080fa148c5e768bb1a0b6f7201c01
        Signed-off-by: Joe Smith <joe.smith@foo.org>

Requirements for Android-specific patches: ANDROID:

  • If the patch is fixing a bug to Android-specific code
    • tag the patch subject with ANDROID:
    • add a Fixes: tag that cites the patch with the bug
    • Example:
        ANDROID: fix android-specific bug in foobar.c

        This is the detailed description of the important fix

        Fixes: 1234abcd2468 ("foobar: add cool feature")
        Change-Id: I4caaaa566ea080fa148c5e768bb1a0b6f7201c01
        Signed-off-by: Joe Smith <joe.smith@foo.org>
  • If the patch is a new feature
    • tag the patch subject with ANDROID:
    • add a Bug: tag with the Android bug (required for android-specific features)