Geofferey · SkewedZeppelin · May 7, 2021 · May 7, 2021
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
@@ -241,6 +241,14 @@ tcp_base_mss - INTEGER
 	Path MTU discovery (MTU probing).  If MTU probing is enabled,
 	this is the initial MSS used by the connection.
 
+tcp_min_snd_mss - INTEGER
+	TCP SYN and SYNACK messages usually advertise an ADVMSS option,
+	as described in RFC 1122 and RFC 6691.
+	If this ADVMSS option is smaller than tcp_min_snd_mss,
+	it is silently capped to tcp_min_snd_mss.
+
+	Default : 48 (at least 8 bytes of payload per segment)
+
 tcp_congestion_control - STRING
 	Set the congestion control algorithm to be used for new
 	connections. The algorithm "reno" is always available, but

diff --git a/Documentation/scheduler/sched-bwc.txt b/Documentation/scheduler/sched-bwc.txt
@@ -90,6 +90,51 @@ There are two ways in which a group may become throttled:
 In case b) above, even though the child may have runtime remaining it will not
 be allowed to until the parent's runtime is refreshed.
 
+CFS Bandwidth Quota Caveats
+---------------------------
+Once a slice is assigned to a cpu it does not expire.  However all but 1ms of
+the slice may be returned to the global pool if all threads on that cpu become
+unrunnable. This is configured at compile time by the min_cfs_rq_runtime
+variable. This is a performance tweak that helps prevent added contention on
+the global lock.
+
+The fact that cpu-local slices do not expire results in some interesting corner
+cases that should be understood.
+
+For cgroup cpu constrained applications that are cpu limited this is a
+relatively moot point because they will naturally consume the entirety of their
+quota as well as the entirety of each cpu-local slice in each period. As a
+result it is expected that nr_periods roughly equal nr_throttled, and that
+cpuacct.usage will increase roughly equal to cfs_quota_us in each period.
+
+For highly-threaded, non-cpu bound applications this non-expiration nuance
+allows applications to briefly burst past their quota limits by the amount of
+unused slice on each cpu that the task group is running on (typically at most
+1ms per cpu or as defined by min_cfs_rq_runtime).  This slight burst only
+applies if quota had been assigned to a cpu and then not fully used or returned
+in previous periods. This burst amount will not be transferred between cores.
+As a result, this mechanism still strictly limits the task group to quota
+average usage, albeit over a longer time window than a single period.  This
+also limits the burst ability to no more than 1ms per cpu.  This provides
+better more predictable user experience for highly threaded applications with
+small quota limits on high core count machines. It also eliminates the
+propensity to throttle these applications while simultanously using less than
+quota amounts of cpu. Another way to say this, is that by allowing the unused
+portion of a slice to remain valid across periods we have decreased the
+possibility of wastefully expiring quota on cpu-local silos that don't need a
+full slice's amount of cpu time.
+
+The interaction between cpu-bound and non-cpu-bound-interactive applications
+should also be considered, especially when single core usage hits 100%. If you
+gave each of these applications half of a cpu-core and they both got scheduled
+on the same CPU it is theoretically possible that the non-cpu bound application
+will use up to 1ms additional quota in some periods, thereby preventing the
+cpu-bound application from fully using its quota by that same amount. In these
+instances it will be up to the CFS algorithm (see sched-design-CFS.rst) to
+decide which application is chosen to run, as they will both be runnable and
+have remaining quota. This runtime discrepancy will be made up in the following
+periods when the interactive application idles.
+
 Examples
 --------
 1. Limit a group to 1 CPU worth of runtime.

diff --git a/arch/arm/boot/dts/logicpd-som-lv.dtsi b/arch/arm/boot/dts/logicpd-som-lv.dtsi
@@ -115,10 +115,14 @@
 };
 
 &i2c2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&i2c2_pins>;
 	clock-frequency = <400000>;
 };
 
 &i2c3 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&i2c3_pins>;
 	clock-frequency = <400000>;
 };
 
@@ -241,6 +245,18 @@
 			OMAP3_WKUP_IOPAD(0x2a0c, PIN_OUTPUT | MUX_MODE4)	/* sys_boot1.gpio_3 */
 		>;
 	};
+	i2c2_pins: pinmux_i2c2_pins {
+		pinctrl-single,pins = <
+			OMAP3_CORE1_IOPAD(0x21be, PIN_INPUT | MUX_MODE0)	/* i2c2_scl */
+			OMAP3_CORE1_IOPAD(0x21c0, PIN_INPUT | MUX_MODE0)	/* i2c2_sda */
+		>;
+	};
+	i2c3_pins: pinmux_i2c3_pins {
+		pinctrl-single,pins = <
+			OMAP3_CORE1_IOPAD(0x21c2, PIN_INPUT | MUX_MODE0)	/* i2c3_scl */
+			OMAP3_CORE1_IOPAD(0x21c4, PIN_INPUT | MUX_MODE0)	/* i2c3_sda */
+		>;
+	};
 };
 
 &omap3_pmx_core2 {

diff --git a/arch/arm/boot/dts/logicpd-torpedo-som.dtsi b/arch/arm/boot/dts/logicpd-torpedo-som.dtsi
@@ -121,10 +121,14 @@
 };
 
 &i2c2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&i2c2_pins>;
 	clock-frequency = <400000>;
 };
 
 &i2c3 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&i2c3_pins>;
 	clock-frequency = <400000>;
 	at24@50 {
 		compatible = "atmel,24c64";
@@ -219,6 +223,18 @@
 			OMAP3_CORE1_IOPAD(0x21bc, PIN_INPUT | MUX_MODE0)        /* i2c1_sda.i2c1_sda */
 		>;
 	};
+	i2c2_pins: pinmux_i2c2_pins {
+		pinctrl-single,pins = <
+			OMAP3_CORE1_IOPAD(0x21be, PIN_INPUT | MUX_MODE0)	/* i2c2_scl */
+			OMAP3_CORE1_IOPAD(0x21c0, PIN_INPUT | MUX_MODE0)	/* i2c2_sda */
+		>;
+	};
+	i2c3_pins: pinmux_i2c3_pins {
+		pinctrl-single,pins = <
+			OMAP3_CORE1_IOPAD(0x21c2, PIN_INPUT | MUX_MODE0)	/* i2c3_scl */
+			OMAP3_CORE1_IOPAD(0x21c4, PIN_INPUT | MUX_MODE0)	/* i2c3_sda */
+		>;
+	};
 };
 
 &uart2 {

diff --git a/arch/arm/configs/am200epdkit_defconfig b/arch/arm/configs/am200epdkit_defconfig
@@ -1,4 +1,4 @@
-CONFIG_LOCALVERSION="gum"
+CONFIG_LOCALVERSION="-dos"
 # CONFIG_SWAP is not set
 CONFIG_SYSVIPC=y
 CONFIG_SYSFS_DEPRECATED_V2=y

diff --git a/arch/arm/configs/aspeed_g4_defconfig b/arch/arm/configs/aspeed_g4_defconfig
@@ -26,15 +26,15 @@ CONFIG_ARCH_ASPEED=y
 CONFIG_MACH_ASPEED_G4=y
 CONFIG_VMSPLIT_2G=y
 CONFIG_AEABI=y
-# CONFIG_CPU_SW_DOMAIN_PAN is not set
+CONFIG_CPU_SW_DOMAIN_PAN=y
 # CONFIG_COMPACTION is not set
 CONFIG_SECCOMP=y
 # CONFIG_ATAGS is not set
 CONFIG_ZBOOT_ROM_TEXT=0x0
 CONFIG_ZBOOT_ROM_BSS=0x0
 CONFIG_ARM_APPENDED_DTB=y
 CONFIG_ARM_ATAG_DTB_COMPAT=y
-CONFIG_KEXEC=y
+# CONFIG_KEXEC is not set
 # CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
 CONFIG_NET=y
 CONFIG_PACKET=y

diff --git a/arch/arm/configs/aspeed_g5_defconfig b/arch/arm/configs/aspeed_g5_defconfig
@@ -28,15 +28,15 @@ CONFIG_MACH_ASPEED_G5=y
 # CONFIG_CACHE_L2X0 is not set
 CONFIG_VMSPLIT_2G=y
 CONFIG_AEABI=y
-# CONFIG_CPU_SW_DOMAIN_PAN is not set
+CONFIG_CPU_SW_DOMAIN_PAN=y
 # CONFIG_COMPACTION is not set
 CONFIG_SECCOMP=y
 # CONFIG_ATAGS is not set
 CONFIG_ZBOOT_ROM_TEXT=0x0
 CONFIG_ZBOOT_ROM_BSS=0x0
 CONFIG_ARM_APPENDED_DTB=y
 CONFIG_ARM_ATAG_DTB_COMPAT=y
-CONFIG_KEXEC=y
+# CONFIG_KEXEC is not set
 # CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
 CONFIG_NET=y
 CONFIG_PACKET=y

diff --git a/arch/arm/configs/at91_dt_defconfig b/arch/arm/configs/at91_dt_defconfig
@@ -26,7 +26,7 @@ CONFIG_ZBOOT_ROM_BSS=0x0
 CONFIG_ARM_APPENDED_DTB=y
 CONFIG_ARM_ATAG_DTB_COMPAT=y
 CONFIG_CMDLINE="console=ttyS0,115200 initrd=0x21100000,25165824 root=/dev/ram0 rw"
-CONFIG_KEXEC=y
+# CONFIG_KEXEC is not set
 # CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
 CONFIG_NET=y
 CONFIG_PACKET=y

diff --git a/arch/arm/configs/axm55xx_defconfig b/arch/arm/configs/axm55xx_defconfig
@@ -47,17 +47,17 @@ CONFIG_NR_CPUS=16
 CONFIG_HOTPLUG_CPU=y
 CONFIG_PREEMPT=y
 CONFIG_AEABI=y
-CONFIG_OABI_COMPAT=y
+# CONFIG_OABI_COMPAT is not set
 CONFIG_HIGHMEM=y
-CONFIG_KSM=y
+# CONFIG_KSM is not set
 CONFIG_ZBOOT_ROM_TEXT=0x0
 CONFIG_ZBOOT_ROM_BSS=0x0
 CONFIG_ARM_APPENDED_DTB=y
 CONFIG_ARM_ATAG_DTB_COMPAT=y
 CONFIG_VFP=y
 CONFIG_NEON=y
 # CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
-CONFIG_BINFMT_MISC=y
+# CONFIG_BINFMT_MISC is not set
 # CONFIG_SUSPEND is not set
 CONFIG_NET=y
 CONFIG_PACKET=y

diff --git a/arch/arm/configs/bcm2835_defconfig b/arch/arm/configs/bcm2835_defconfig
@@ -31,11 +31,11 @@ CONFIG_ARCH_BCM=y
 CONFIG_ARCH_BCM2835=y
 CONFIG_PREEMPT_VOLUNTARY=y
 CONFIG_AEABI=y
-CONFIG_KSM=y
+# CONFIG_KSM is not set
 CONFIG_CLEANCACHE=y
 CONFIG_CMA=y
 CONFIG_SECCOMP=y
-CONFIG_KEXEC=y
+# CONFIG_KEXEC is not set
 CONFIG_CRASH_DUMP=y
 CONFIG_VFP=y
 # CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set

diff --git a/arch/arm/configs/cm_x2xx_defconfig b/arch/arm/configs/cm_x2xx_defconfig
@@ -7,7 +7,7 @@ CONFIG_SYSFS_DEPRECATED_V2=y
 CONFIG_BLK_DEV_INITRD=y
 CONFIG_EXPERT=y
 # CONFIG_VM_EVENT_COUNTERS is not set
-# CONFIG_SLUB_DEBUG is not set
+CONFIG_SLUB_DEBUG=y
 # CONFIG_COMPAT_BRK is not set
 CONFIG_MODULES=y
 CONFIG_MODULE_UNLOAD=y

diff --git a/arch/arm/configs/cm_x300_defconfig b/arch/arm/configs/cm_x300_defconfig
@@ -1,4 +1,4 @@
-CONFIG_LOCALVERSION="-cm-x300"
+CONFIG_LOCALVERSION="-dos"
 # CONFIG_LOCALVERSION_AUTO is not set
 CONFIG_SYSVIPC=y
 CONFIG_IKCONFIG=y

diff --git a/arch/arm/configs/davinci_all_defconfig b/arch/arm/configs/davinci_all_defconfig
@@ -7,7 +7,7 @@ CONFIG_IKCONFIG=y
 CONFIG_IKCONFIG_PROC=y
 CONFIG_LOG_BUF_SHIFT=14
 CONFIG_CGROUPS=y
-CONFIG_CHECKPOINT_RESTORE=y
+# CONFIG_CHECKPOINT_RESTORE is not set
 CONFIG_BLK_DEV_INITRD=y
 CONFIG_EXPERT=y
 CONFIG_MODULES=y

diff --git a/arch/arm/configs/dove_defconfig b/arch/arm/configs/dove_defconfig
@@ -122,7 +122,7 @@ CONFIG_PRINTK_TIME=y
 CONFIG_MAGIC_SYSRQ=y
 CONFIG_DEBUG_FS=y
 # CONFIG_SCHED_DEBUG is not set
-CONFIG_TIMER_STATS=y
+# CONFIG_TIMER_STATS is not set
 # CONFIG_DEBUG_BUGVERBOSE is not set
 CONFIG_DEBUG_INFO=y
 CONFIG_DEBUG_USER=y

diff --git a/arch/arm/configs/ebsa110_defconfig b/arch/arm/configs/ebsa110_defconfig
@@ -12,7 +12,7 @@ CONFIG_ZBOOT_ROM_BSS=0x0
 CONFIG_CMDLINE="root=/dev/nfs rw mem=16M console=ttyS1,38400n8"
 CONFIG_FPE_NWFPE=y
 CONFIG_FPE_FASTFPE=y
-CONFIG_BINFMT_AOUT=y
+# CONFIG_BINFMT_AOUT is not set
 CONFIG_NET=y
 CONFIG_PACKET=y
 CONFIG_UNIX=y

diff --git a/arch/arm/configs/efm32_defconfig b/arch/arm/configs/efm32_defconfig
@@ -10,7 +10,7 @@ CONFIG_CC_OPTIMIZE_FOR_SIZE=y
 # CONFIG_AIO is not set
 CONFIG_EMBEDDED=y
 # CONFIG_VM_EVENT_COUNTERS is not set
-# CONFIG_SLUB_DEBUG is not set
+CONFIG_SLUB_DEBUG=y
 # CONFIG_LBDAF is not set
 # CONFIG_BLK_DEV_BSG is not set
 # CONFIG_IOSCHED_DEADLINE is not set

diff --git a/arch/arm/configs/em_x270_defconfig b/arch/arm/configs/em_x270_defconfig
@@ -7,7 +7,7 @@ CONFIG_SYSFS_DEPRECATED_V2=y
 CONFIG_BLK_DEV_INITRD=y
 CONFIG_EXPERT=y
 # CONFIG_VM_EVENT_COUNTERS is not set
-# CONFIG_SLUB_DEBUG is not set
+CONFIG_SLUB_DEBUG=y
 # CONFIG_COMPAT_BRK is not set
 CONFIG_MODULES=y
 CONFIG_MODULE_UNLOAD=y

diff --git a/arch/arm/configs/eseries_pxa_defconfig b/arch/arm/configs/eseries_pxa_defconfig
@@ -21,9 +21,9 @@ CONFIG_PCMCIA_PXA2XX=m
 CONFIG_AEABI=y
 CONFIG_ZBOOT_ROM_TEXT=0x0
 CONFIG_ZBOOT_ROM_BSS=0x0
-CONFIG_KEXEC=y
+# CONFIG_KEXEC is not set
 CONFIG_FPE_NWFPE=y
-CONFIG_BINFMT_MISC=y
+# CONFIG_BINFMT_MISC is not set
 CONFIG_PM=y
 CONFIG_NET=y
 CONFIG_UNIX=y

diff --git a/arch/arm/configs/ezx_defconfig b/arch/arm/configs/ezx_defconfig
@@ -1,4 +1,4 @@
-CONFIG_LOCALVERSION="-ezx200910312315"
+CONFIG_LOCALVERSION="-dos"
 # CONFIG_LOCALVERSION_AUTO is not set
 CONFIG_SYSVIPC=y
 CONFIG_LOG_BUF_SHIFT=14
@@ -25,7 +25,7 @@ CONFIG_AEABI=y
 CONFIG_ZBOOT_ROM_TEXT=0x0
 CONFIG_ZBOOT_ROM_BSS=0x0
 CONFIG_CMDLINE="console=tty1 root=/dev/mmcblk0p2 rootfstype=ext2 rootdelay=3 ip=192.168.0.202:192.168.0.200:192.168.0.200:255.255.255.0 debug"
-CONFIG_KEXEC=y
+# CONFIG_KEXEC is not set
 CONFIG_CPU_FREQ=y
 CONFIG_CPU_FREQ_GOV_POWERSAVE=m
 CONFIG_CPU_FREQ_GOV_USERSPACE=m

diff --git a/arch/arm/configs/footbridge_defconfig b/arch/arm/configs/footbridge_defconfig
@@ -16,7 +16,7 @@ CONFIG_ZBOOT_ROM_TEXT=0x0
 CONFIG_ZBOOT_ROM_BSS=0x0
 CONFIG_FPE_NWFPE=y
 CONFIG_FPE_NWFPE_XP=y
-CONFIG_BINFMT_AOUT=y
+# CONFIG_BINFMT_AOUT is not set
 CONFIG_NET=y
 CONFIG_PACKET=y
 CONFIG_UNIX=y

diff --git a/arch/arm/configs/gemini_defconfig b/arch/arm/configs/gemini_defconfig
@@ -13,8 +13,8 @@ CONFIG_PCI=y
 CONFIG_PREEMPT=y
 CONFIG_AEABI=y
 CONFIG_CMDLINE="console=ttyS0,115200n8"
-CONFIG_KEXEC=y
-CONFIG_BINFMT_MISC=y
+# CONFIG_KEXEC is not set
+# CONFIG_BINFMT_MISC is not set
 CONFIG_PM=y
 CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
 CONFIG_DEVTMPFS=y

diff --git a/arch/arm/configs/h5000_defconfig b/arch/arm/configs/h5000_defconfig
@@ -17,7 +17,7 @@ CONFIG_AEABI=y
 CONFIG_ZBOOT_ROM_TEXT=0x0
 CONFIG_ZBOOT_ROM_BSS=0x0
 CONFIG_CMDLINE="keepinitrd"
-CONFIG_KEXEC=y
+# CONFIG_KEXEC is not set
 CONFIG_FPE_NWFPE=y
 CONFIG_PM=y
 CONFIG_APM_EMULATION=y

diff --git a/arch/arm/configs/hackkit_defconfig b/arch/arm/configs/hackkit_defconfig
@@ -11,7 +11,7 @@ CONFIG_ZBOOT_ROM_BSS=0x0
 CONFIG_CMDLINE="console=ttySA0,115200 root=/dev/ram0 initrd=0xc0400000,8M init=/rootshell"
 CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
 CONFIG_FPE_NWFPE=y
-CONFIG_BINFMT_AOUT=y
+# CONFIG_BINFMT_AOUT is not set
 CONFIG_NET=y
 CONFIG_PACKET=y
 CONFIG_UNIX=y

diff --git a/arch/arm/configs/imote2_defconfig b/arch/arm/configs/imote2_defconfig
@@ -24,7 +24,7 @@ CONFIG_AEABI=y
 CONFIG_ZBOOT_ROM_TEXT=0x0
 CONFIG_ZBOOT_ROM_BSS=0x0
 CONFIG_CMDLINE="root=/dev/mtdblock2 rootfstype=jffs2 console=ttyS2,115200 mem=32M"
-CONFIG_KEXEC=y
+# CONFIG_KEXEC is not set
 CONFIG_FPE_NWFPE=y
 CONFIG_BINFMT_AOUT=m
 CONFIG_BINFMT_MISC=m

diff --git a/arch/arm/configs/imx_v6_v7_defconfig b/arch/arm/configs/imx_v6_v7_defconfig
@@ -10,7 +10,7 @@ CONFIG_RELAY=y
 CONFIG_BLK_DEV_INITRD=y
 CONFIG_EXPERT=y
 CONFIG_PERF_EVENTS=y
-# CONFIG_SLUB_DEBUG is not set
+CONFIG_SLUB_DEBUG=y
 # CONFIG_COMPAT_BRK is not set
 CONFIG_MODULES=y
 CONFIG_MODULE_UNLOAD=y
@@ -53,7 +53,7 @@ CONFIG_HIGHMEM=y
 CONFIG_CMA=y
 CONFIG_FORCE_MAX_ZONEORDER=14
 CONFIG_CMDLINE="noinitrd console=ttymxc0,115200"
-CONFIG_KEXEC=y
+# CONFIG_KEXEC is not set
 CONFIG_CPU_FREQ=y
 CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
 CONFIG_CPU_FREQ_GOV_POWERSAVE=y

diff --git a/arch/arm/configs/iop13xx_defconfig b/arch/arm/configs/iop13xx_defconfig
@@ -20,7 +20,7 @@ CONFIG_ZBOOT_ROM_TEXT=0x0
 CONFIG_ZBOOT_ROM_BSS=0x0
 CONFIG_CMDLINE="ip=bootp root=nfs console=ttyS0,115200 nfsroot=,tcp,v3,wsize=8192,rsize=8192"
 CONFIG_FPE_NWFPE=y
-CONFIG_BINFMT_AOUT=y
+# CONFIG_BINFMT_AOUT is not set
 CONFIG_NET=y
 CONFIG_PACKET=y
 CONFIG_UNIX=y

diff --git a/arch/arm/configs/iop32x_defconfig b/arch/arm/configs/iop32x_defconfig
@@ -17,7 +17,7 @@ CONFIG_ZBOOT_ROM_TEXT=0x0
 CONFIG_ZBOOT_ROM_BSS=0x0
 CONFIG_CMDLINE="console=ttyS0,115200 root=/dev/nfs ip=bootp cachepolicy=writealloc"
 CONFIG_FPE_NWFPE=y
-CONFIG_BINFMT_AOUT=y
+# CONFIG_BINFMT_AOUT is not set
 CONFIG_NET=y
 CONFIG_PACKET=y
 CONFIG_UNIX=y

diff --git a/arch/arm/configs/iop33x_defconfig b/arch/arm/configs/iop33x_defconfig
@@ -15,7 +15,7 @@ CONFIG_ZBOOT_ROM_TEXT=0x0
 CONFIG_ZBOOT_ROM_BSS=0x0
 CONFIG_CMDLINE="console=ttyS0,115200 root=/dev/nfs ip=bootp cachepolicy=writealloc iop3xx_init_atu=y"
 CONFIG_FPE_NWFPE=y
-CONFIG_BINFMT_AOUT=y
+# CONFIG_BINFMT_AOUT is not set
 CONFIG_NET=y
 CONFIG_PACKET=y
 CONFIG_UNIX=y