Loss of several MB of run-time memory
Patrick Venture
venture at google.com
Wed Oct 10 04:20:39 AEDT 2018
On Tue, Oct 9, 2018 at 10:06 AM Kun Yi <kunyi at google.com> wrote:
>
> A somewhat tedious way to test would be to build and boot with 'bitbake core-image-minimal' to ensure no phosphor-daemons are loaded, and
then compare the kernel memory footprint.
So, I went through and dropped all the unused image_Features will
dropped a lot of daemons. I should have about the same between the
two images, but I can do some side-by-sides of the filesystem. The ps
is nearly identical.
>
> On Tue, Oct 9, 2018 at 10:01 AM Tanous, Ed <ed.tanous at intel.com> wrote:
>>
>> Was this only the kernel version jump, or did you jump in openbmc/phosphor levels as well? There have been quite a few daemons added in the last 6 months or so that could explain your memory footprint increase.
>>
>> -Ed
>>
>>
>>
>> > On Oct 9, 2018, at 9:54 AM, Patrick Venture <venture at google.com> wrote:
>> >
>> > Just jumped from 4.7 kernel to 4.18 running the latest openbmc image
>> > on the quanta-q71l board. And I see now I have ~20MiB of RAM free for
>> > stuff once things are settled, whereas before I could have up to
>> > 35MiB.
>> >
>> > Here are some dumps:
>> >
>> > Now:
>> > [ 0.000000] CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=0005317f
>> > [ 0.000000] CPU: VIVT data cache, VIVT instruction cache
>> > [ 0.000000] OF: fdt: Machine model: Quanta Q71L BMC
>> > [ 0.000000] Memory policy: Data cache writeback
>> > [ 0.000000] On node 0 totalpages: 30720
>> > [ 0.000000] Normal zone: 240 pages used for memmap
>> > [ 0.000000] Normal zone: 0 pages reserved
>> > [ 0.000000] Normal zone: 30720 pages, LIFO batch:7
>> > [ 0.000000] random: get_random_bytes called from
>> > start_kernel+0x8c/0x4c0 with crng_init=0
>> > [ 0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
>> > [ 0.000000] pcpu-alloc: [0] 0
>> > [ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 30480
>> > [ 0.000000] Kernel command line: console=ttyS4,115200n8
>> > root=/dev/ram rw clk_ignore_unused
>> > [ 0.000000] Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
>> > [ 0.000000] Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
>> > [ 0.000000] Memory: 111076K/122880K available (5120K kernel code,
>> > 365K rwdata, 1104K rodata, 1024K init, 143K bss, 11804K reserved, 0K
>> > cma-reserved)
>> > [ 0.000000] Virtual kernel memory layout:
>> > [ 0.000000] vector : 0xffff0000 - 0xffff1000 ( 4 kB)
>> > [ 0.000000] fixmap : 0xffc00000 - 0xfff00000 (3072 kB)
>> > [ 0.000000] vmalloc : 0x88000000 - 0xff800000 (1912 MB)
>> > [ 0.000000] lowmem : 0x80000000 - 0x87800000 ( 120 MB)
>> > [ 0.000000] .text : 0x(ptrval) - 0x(ptrval) (6112 kB)
>> > [ 0.000000] .init : 0x(ptrval) - 0x(ptrval) (1024 kB)
>> > [ 0.000000] .data : 0x(ptrval) - 0x(ptrval) ( 366 kB)
>> > [ 0.000000] .bss : 0x(ptrval) - 0x(ptrval) ( 144 kB)
>> > [ 0.000000] ftrace: allocating 18546 entries in 55 pages
>> >
>> > cat /proc/meminfo
>> > MemTotal: 113952 kB
>> > MemFree: 19944 kB
>> > MemAvailable: 62432 kB
>> > Buffers: 11032 kB
>> > Cached: 48732 kB
>> > SwapCached: 0 kB
>> > Active: 40940 kB
>> > Inactive: 26728 kB
>> > Active(anon): 17068 kB
>> > Inactive(anon): 9316 kB
>> > Active(file): 23872 kB
>> > Inactive(file): 17412 kB
>> > Unevictable: 9088 kB
>> > Mlocked: 0 kB
>> > SwapTotal: 0 kB
>> > SwapFree: 0 kB
>> > Dirty: 0 kB
>> > Writeback: 0 kB
>> > AnonPages: 17008 kB
>> > Mapped: 21120 kB
>> > Shmem: 9392 kB
>> > Slab: 11956 kB
>> > SReclaimable: 6472 kB
>> > SUnreclaim: 5484 kB
>> > KernelStack: 560 kB
>> > PageTables: 1384 kB
>> > NFS_Unstable: 0 kB
>> > Bounce: 0 kB
>> > WritebackTmp: 0 kB
>> > CommitLimit: 56976 kB
>> > Committed_AS: 124224 kB
>> > VmallocTotal: 1957888 kB
>> > VmallocUsed: 0 kB
>> > VmallocChunk: 0 kB
>> >
>> > Before:
>> > dmesg
>> > Normal zone: 30720 pages, LIFO batch:7
>> > pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
>> > pcpu-alloc: [0] 0
>> > Built 1 zonelists in Zone order, mobility grouping on. Total pages: 30480
>> > Kernel command line: console=ttyS4,115200n8 root=/dev/ram rw
>> > PID hash table entries: 512 (order: -1, 2048 bytes)
>> > Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
>> > Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
>> > Memory: 113644K/122880K available (4206K kernel code, 150K rwdata,
>> > 860K rodata, 1024K init, 111K bss, 9236K reserved, 0K cma-reserved)
>> > Virtual kernel memory layout:
>> > vector : 0xffff0000 - 0xffff1000 ( 4 kB)
>> > fixmap : 0xffc00000 - 0xfff00000 (3072 kB)
>> > vmalloc : 0xc8000000 - 0xff800000 ( 888 MB)
>> > lowmem : 0xc0000000 - 0xc7800000 ( 120 MB)
>> > .text : 0xc0008000 - 0xc05f28ec (6059 kB)
>> > .init : 0xc0600000 - 0xc0700000 (1024 kB)
>> > .data : 0xc0700000 - 0xc0725be8 ( 151 kB)
>> > .bss : 0xc0725be8 - 0xc0741a38 ( 112 kB)
>> >
>> > cat /proc/meminfo
>> > MemTotal: 116224 kB
>> > MemFree: 35832 kB
>> > MemAvailable: 76952 kB
>> > Buffers: 9596 kB
>> > Cached: 39776 kB
>> > SwapCached: 0 kB
>> > Active: 40516 kB
>> > Inactive: 25432 kB
>> > Active(anon): 17004 kB
>> > Inactive(anon): 6968 kB
>> > Active(file): 23512 kB
>> > Inactive(file): 18464 kB
>> > Unevictable: 0 kB
>> > Mlocked: 0 kB
>> > SwapTotal: 0 kB
>> > SwapFree: 0 kB
>> > Dirty: 0 kB
>> > Writeback: 0 kB
>> > AnonPages: 16588 kB
>> > Mapped: 20064 kB
>> > Shmem: 7396 kB
>> > Slab: 9424 kB
>> > SReclaimable: 4532 kB
>> > SUnreclaim: 4892 kB
>> > KernelStack: 720 kB
>> > PageTables: 1328 kB
>> > NFS_Unstable: 0 kB
>> > Bounce: 0 kB
>> > WritebackTmp: 0 kB
>> > CommitLimit: 58112 kB
>> > Committed_AS: 142324 kB
>> > VmallocTotal: 909312 kB
>> > VmallocUsed: 0 kB
>> > VmallocChunk: 0 kB
>> >
>> > This matters for a few reasons:
>> > 1) my memory chip is too small to be practical and I need all the
>> > bytes I can get.
>> > 2) I need at least 32MiB to load a new firmware image.
>> >
>> > I dropped all the python except the mapper, and I dropped the newer
>> > daemons from my build to clear out that difference. It was originally
>> > about 16MiB difference, so I was thinking that something is now being
>> > mapped by default that wasn't before, such as part of a flash image.
>> >
>> > Patrick
>
>
>
> --
> Regards,
> Kun
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