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Filename Latest commit message Latest commit date
Saravana Kannan 2094bed752 PM / devfreq: Add cache HW monitor governor 
The cache HW monitor devfreq governor uses the hardware counters to
determine the load on the cache and the appropriate frequency needed to
support that load. This governor can be used in conjunction with the cache
devfreq device to dynamically scale the cache frequency based on the
demand/actual usage from the CPU subsystem.

The governor is written to be agnostic of the actual counters used to
determine the load. On Krait based CPUs, the governor uses the Krait L2 PM
counters which can conflict with certain profiling tools.

The Krait L2 performance monitor counters have the capability to count
different types of requests going to the L2 cache. They also have the
capability to raise interrupts when they overflow. This driver uses those
counters to determine the true usage of L2 from the Krait processor
subsystem and then recommends L2 frequency based on the measured values and
the following tunable parameters.

The driver provides various tunables that allow it to be tuned more in
favor of power or performance:

- cycles_per_high_req: The no. of cache clock cycles that are necessary to
  efficiently process a high-work request to the cache. A higher value
  means higher power and potentially higher performance. A lower value
  means lower power and potentially lower performance.

- cycles_per_med_req: The no. of cache clock cycles that are necessary to
  efficiently process a medium-work request to the cache. A higher value
  means higher power and potentially higher performance. A lower value
  means lower power and potentially lower performance.

- polling_ms: The sampling period in milliseconds. This only affects the
  sampling period when cache use is ramping down or is increasing very
  slowly (See tolerance_mrps).

- min_busy: The minimum percentage of time the cache should be busy. This
  is also applied as a lower bound to the measured busy percentage before
  it's used in calculations. This has to be lower than or equal to
  max_busy. Lower values will make the scaling more aggressive.

- max_busy: The maximum percentage of time the cache should be busy. This
  is also applied as an upper bound to the measured busy percentage before
  it's used in calculations. This has to be greater than or equal to
  min_busy. Lower values will make the scaling more aggressive.

- tolerance_mrps: The minimum increase (in millions of requests per second)
  in cache requests, compared to previous sample, that will trigger an IRQ
  to immediately re-evaluate the cache frequency.

- decay_rate: The parameter controls the rate at which the history is
  forgotten when ramping down. This is expressed as a percentage of history
  to be forgotten. So 100% means ignore history, 0% means never forget the
  historical max. The default 90% means forget 90% of history each time.

- guard_band_mhz: This is a margin that's added to the computed cache
  frequency to account for the time it takes between the load increasing
  and the governor/device finishes ramping up the cache frequency.

Change-Id: I918ae178cd3c9d14cb7714d7eb312cbbbb0d977b
Signed-off-by: Saravana Kannan <skannan@codeaurora.org>
[aparnam@codeaurora.org: Replaced snprintf with scnprintf]
Signed-off-by: Rama Aparna Mallavarapu <aparnam@codeaurora.org>
[avajid@codeaurora.org: updated attr definitions and made minor styling changes]
Signed-off-by: Amir Vajid <avajid@codeaurora.org>
2019-11-15 14:41:27 -08:00
arch Merge "arm64: Kconfig: Don't select COMMON_CLK_QCOM in ARCH_LAHAINA" 2019-11-13 17:41:27 -08:00
block Linux 5.4-rc6 2019-11-04 06:51:47 +01:00
certs
crypto
Documentation Merge remote-tracking branch 'remotes/origin/tmp-aefd2d632eb0' into msm-lahaina 2019-11-04 17:30:19 -08:00
drivers PM / devfreq: Add cache HW monitor governor 2019-11-15 14:41:27 -08:00
fs Linux 5.4-rc6 2019-11-04 06:51:47 +01:00
include Merge "interconnect: qcom: add virt_clk provider and QUP nodes" 2019-11-14 12:02:31 -08:00
init Merge remote-tracking branch 'remotes/origin/tmp-aefd2d632eb0' into msm-lahaina 2019-11-04 17:30:19 -08:00
ipc
kernel Merge remote-tracking branch 'remotes/origin/tmp-aefd2d632eb0' into msm-lahaina 2019-11-04 17:30:19 -08:00
lib Merge remote-tracking branch 'remotes/origin/tmp-aefd2d632eb0' into msm-lahaina 2019-11-04 17:30:19 -08:00
LICENSES
mm Merge remote-tracking branch 'remotes/origin/tmp-aefd2d632eb0' into msm-lahaina 2019-11-04 17:30:19 -08:00
net Merge remote-tracking branch 'remotes/origin/tmp-aefd2d632eb0' into msm-lahaina 2019-11-04 17:30:19 -08:00
samples
scripts Merge remote-tracking branch 'remotes/origin/tmp-aefd2d632eb0' into msm-lahaina 2019-11-04 17:30:19 -08:00
security Linux 5.4-rc6 2019-11-04 06:51:47 +01:00
sound ASoC: core: Fix possible NULL pointer dereference 2019-11-13 20:34:29 -08:00
techpack
tools USB fixes for 5.4-rc6 2019-11-03 08:25:25 -08:00
usr
virt kvm: call kvm_arch_destroy_vm if vm creation fails 2019-10-31 12:13:16 +01:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
abi_gki_aarch64.xml
abi_gki_aarch64_c249464.xml Subject: [PATCH 2/3] ABI: aarch64: Update ABI snapshot based on v5.4-rc6 2019-11-12 16:51:04 -08:00
build.config.aarch64
build.config.allmodconfig ANDROID: Remove KVM_INTEL allmodconfig workaround 2019-10-31 10:52:27 -07:00
build.config.allmodconfig.aarch64
build.config.allmodconfig.x86_64
build.config.common
build.config.gki
build.config.gki.aarch64
build.config.gki.x86_64
build.config.x86_64
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-11-01 17:48:11 -07:00
Makefile Merge remote-tracking branch 'remotes/origin/tmp-aefd2d632eb0' into msm-lahaina 2019-11-04 17:30:19 -08:00
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)