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| == b2g-ps ==
| | #REDIRECT [[FirefoxOS/Performance/Memory/ADB Tools]] |
| The <code>b2g-ps</code> command performs a simple process listing and filter out all non-b2g processes. While it does not provide too much memory information, it is usable on production devices where <code>root</code> is not available.
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| The command provides:
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| * <code>RSS</code>: The combined, unique and shared, memory currently paged into the process as Resident Set Size.
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| * <code>VSIZE</code>: The virtual address space referenced by the process. This will typically be larger than the actual memory in use.
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| <code><pre>
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| bkelly@lenir:/srv/gaia-master$ adb shell b2g-ps
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| APPLICATION USER PID PPID VSIZE RSS WCHAN PC NAME
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| b2g root 292 1 183060 76256 ffffffff b6f0563c S /system/b2g/b2g
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| (Nuwa) root 815 292 53304 20988 ffffffff b6ea963c S /system/b2g/plugin-container
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| Homescreen u0_a958 958 815 72000 27420 ffffffff b6ea963c S /system/b2g/plugin-container
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| Communications u0_a1303 1303 815 73388 26864 ffffffff b6ea963c S /system/b2g/plugin-container
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| Marketplace u0_a1461 1461 815 89636 39760 ffffffff b6ea963c S /system/b2g/plugin-container
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| (Preallocated a u0_a1512 1512 815 60476 18360 ffffffff b6ea963c S /system/b2g/plugin-container
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| </pre></code>
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| == b2g-info ==
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| The <code>b2g-info</code> command is available on devices flashed with an engineering build. It requires <code>root</code> permissions to run. It provides more detailed information than <code>b2g-ps</code> and also provides data on overall system resources.
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| Specifically, for each process <code>b2g-info</code> provides:
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| * <code>USS</code>: The memory unique to the process as Unique Set Size.
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| * <code>PSS</code>: Memory shared with other processes as Proportional Set Size.
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| * <code>RSS</code>: The combined, unique and shared, memory currently paged into the process as Resident Set Size.
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| * <code>VSIZE</code>: The virtual address space referenced by the process. This will typically be larger than the actual memory in use.
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| For the overall system <code>b2g-info</code> provides:
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| * <code>Free</code>: Free memory not currently in use by any process.
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| * <code>Cache</code>: Memory currently holding files paged into a process. These can typically be flushed back to disk to increase <code>Free</code> memory. Of course, the running application will always need some part of its executable and library paged in, so this will never go to zero.
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| * <code>Free+Cache</code>: The effective total amount of memory the system considers "available" for new processes.
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| Finally, <code>b2g-info</code> provides some information about the thresholds at which it will attempt to kill processes. When <code>Free+Cache</code> (or is it <code>Free</code>?) reaches the given <code>min_free</code> value then processes with the given calculated <code>oom_adj</code> score will be killed.
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| <code><pre>
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| bkelly@lenir:/srv/gaia-master$ adb shell b2g-info
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| | megabytes |
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| NAME PID PPID CPU(s) NICE USS PSS RSS VSIZE OOM_ADJ USER
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| b2g 292 1 75.5 0 57.7 63.1 76.7 178.8 0 root
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| (Nuwa) 815 292 1.4 0 3.7 8.0 20.5 52.1 0 root
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| Homescreen 958 815 5.5 18 11.1 14.4 27.4 70.3 8 u0_a958
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| Communications 1303 815 2.5 18 10.6 13.9 26.9 71.7 10 u0_a1303
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| Marketplace 1461 815 198.4 1 22.7 26.4 40.1 87.5 2 u0_a1461
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| (Preallocated a 1512 815 0.6 18 5.2 7.6 18.2 59.1 10 u0_a1512
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| System memory info:
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| Total 410.6 MB
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| Used - cache 181.1 MB
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| B2G procs (PSS) 133.5 MB
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| Non-B2G procs 47.7 MB
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| Free + cache 229.4 MB
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| Free 96.7 MB
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| Cache 132.7 MB
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| Low-memory killer parameters:
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| notify_trigger 14336 KB
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| oom_adj min_free
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| 0 4096 KB
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| 58 5120 KB
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| 117 6144 KB
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| 352 7168 KB
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| 470 8192 KB
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| 588 20480 KB
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| </pre></code>
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| == /proc/meminfo ==
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| The linux proc filesystem provides additional information about system memory resources at <code>/proc/meminfo</code>. This can be useful if you want to breakdown system memory in a different way than <code>b2g-info</code>.
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| There is a lot of information available in <code>/proc/meminfo</code>. For a description of the various fields please see the [http://linux.die.net/man/5/proc proc(5) man page].
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| <code><pre>
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| bkelly@lenir:/srv/gaia-master$ adb shell cat /proc/meminfo
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| MemTotal: 420412 kB
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| MemFree: 56936 kB
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| Buffers: 16796 kB
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| Cached: 136632 kB
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| SwapCached: 0 kB
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| Active: 159568 kB
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| Inactive: 131732 kB
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| Active(anon): 137884 kB
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| Inactive(anon): 8492 kB
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| Active(file): 21684 kB
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| Inactive(file): 123240 kB
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| Unevictable: 0 kB
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| Mlocked: 0 kB
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| SwapTotal: 196604 kB
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| SwapFree: 196604 kB
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| Dirty: 4 kB
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| Writeback: 0 kB
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| AnonPages: 137900 kB
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| Mapped: 48292 kB
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| Shmem: 8528 kB
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| Slab: 22008 kB
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| SReclaimable: 8664 kB
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| SUnreclaim: 13344 kB
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| KernelStack: 3056 kB
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| PageTables: 2280 kB
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| NFS_Unstable: 0 kB
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| Bounce: 0 kB
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| WritebackTmp: 0 kB
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| CommitLimit: 406808 kB
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| Committed_AS: 248120 kB
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| VmallocTotal: 499712 kB
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| VmallocUsed: 3396 kB
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| VmallocChunk: 409764 kB
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| </pre></code>
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| == /sys/kernel/debug/ion/iommu ==
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| Starting in Android in Jelly Bean (JB) the system now uses the [https://wiki.linaro.org/BenjaminGaignard/ion ion memory allocator] for graphics shared buffers. Due to the complexity of the graphics system this can often be a source for resource exhaustion or other problems.
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| On some devices the kernel provides debug information about ion memory use at <code>/sys/kernel/debug/ion/iommu</code>.
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| Note, on Firefox OS this will report allocations still in use as "orphaned" when they are actually not really leaked. It seems this is related to our multi-process architecture.
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| <code><pre>
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| bkelly@lenir:/srv/gaia-master$ adb shell cat /sys/kernel/debug/ion/iommu
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| client pid size
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| ----------------------------------------------------
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| adsprpc-smd 1 8192
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| ----------------------------------------------------
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| orphaned allocations (info is from last known client):
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| Browser 1758 294912 0 1
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| Marketplace 1461 294912 0 1
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| Browser 1758 294912 0 1
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| Browser 1758 294912 0 1
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| Browser 1758 294912 0 1
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| Browser 1758 294912 0 1
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| Browser 1758 294912 0 1
| |
| Browser 1758 294912 0 1
| |
| Browser 1758 294912 0 1
| |
| Browser 1758 294912 0 1
| |
| Browser 1758 294912 0 1
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| Browser 1758 294912 0 1
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| Browser 1758 294912 0 1
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| Browser 1758 294912 0 1
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| b2g 292 4096 0 1
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| Browser 1758 294912 0 1
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| Marketplace 1461 294912 0 1
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| Marketplace 1461 294912 0 1
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| Marketplace 1461 294912 0 1
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| Marketplace 1461 294912 0 1
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| Browser 1758 294912 0 1
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| b2g 292 4096 0 1
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| b2g 292 4096 0 1
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| Browser 1758 294912 0 1
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| Marketplace 1461 294912 0 1
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| Browser 1758 294912 0 1
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| Browser 1758 294912 0 1
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| Marketplace 1461 294912 0 1
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| Marketplace 1461 294912 0 1
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| Marketplace 1461 4096 0 1
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| b2g 292 1536000 0 1
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| b2g 292 1536000 0 1
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| Marketplace 1461 16384 0 1
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| mdss_fb0 350 1536000 0 1
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| b2g 292 1536000 0 1
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| Marketplace 1461 16384 0 1
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| Marketplace 1461 16384 0 1
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| Marketplace 1461 16384 0 1
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| Marketplace 1461 16384 0 1
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| Communications 1303 294912 0 1
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| Communications 1303 294912 0 1
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| ----------------------------------------------------
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| total orphaned 14499840
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| total 14508032
| |
| ----------------------------------------------------
| |
| Cached Pools:
| |
| 0 order 9 highmem pages in pool = 0 total
| |
| 0 order 9 lowmem pages in pool = 0 total
| |
| 0 order 8 highmem pages in pool = 0 total
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| 0 order 8 lowmem pages in pool = 0 total
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| 0 order 4 highmem pages in pool = 0 total
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| 0 order 4 lowmem pages in pool = 0 total
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| 0 order 0 highmem pages in pool = 0 total
| |
| 3810 order 0 lowmem pages in pool = ee2000 total
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| Uncached Pools:
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| 0 order 9 highmem pages in pool = 0 total
| |
| 0 order 9 lowmem pages in pool = 0 total
| |
| 0 order 8 highmem pages in pool = 0 total
| |
| 0 order 8 lowmem pages in pool = 0 total
| |
| 0 order 4 highmem pages in pool = 0 total
| |
| 0 order 4 lowmem pages in pool = 0 total
| |
| 0 order 0 highmem pages in pool = 0 total
| |
| 0 order 0 lowmem pages in pool = 0 total
| |
| Total bytes in pool: ee2000
| |
| </pre></code>
| |