Messages in this thread | | | From | Hanjun Guo <> | Subject | Suspicious error for CMA stress test | Date | Wed, 2 Mar 2016 21:52:08 +0800 |
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Hi,
I came across a suspicious error for CMA stress test:
Before the test, I got: -bash-4.3# cat /proc/meminfo | grep Cma CmaTotal: 204800 kB CmaFree: 195044 kB
After running the test: -bash-4.3# cat /proc/meminfo | grep Cma CmaTotal: 204800 kB CmaFree: 6602584 kB
So the freed CMA memory is more than total..
Also the the MemFree is more than mem total:
-bash-4.3# cat /proc/meminfo MemTotal: 16342016 kB MemFree: 22367268 kB MemAvailable: 22370528 kB
Here is the kernel module doing the stress test below (if the test case is wrong, correct me), any help would be great appreciated.
The test is running on ARM64 platform (hisilicon D02) with 4.4 kernel, I think the 4.5-rc is the same as I didn't notice the updates for it.
int malloc_dma(void *data) { void *vaddr; struct platform_device * pdev=(struct platform_device*)data; dma_addr_t dma_handle; int i;
for(i=0; i<1000; i++) { vaddr=dma_alloc_coherent(&pdev->dev, malloc_size, &dma_handle, GFP_KERNEL); if (!vaddr) pr_err("alloc cma memory failed!\n");
mdelay(1);
if (vaddr) dma_free_coherent(&pdev->dev,malloc_size,vaddr, dma_handle); } pr_info("alloc free cma memory success return!\n"); return 0; }
static int dma_alloc_coherent_init(struct platform_device *pdev) { int i;
for(i=0; i<100; i++) { task[i] = kthread_create(malloc_dma,pdev,"malloc_dma_%d",i); if(!task[i]) { printk("kthread_create faile %d\n",i); continue; } wake_up_process(task[i]); } return 0; }
Thanks Hanjun
The whole /proc/meminfo:
-bash-4.3# cat /proc/meminfo MemTotal: 16342016 kB MemFree: 22367268 kB MemAvailable: 22370528 kB Buffers: 4292 kB Cached: 36444 kB SwapCached: 0 kB Active: 23564 kB Inactive: 25360 kB Active(anon): 8424 kB Inactive(anon): 64 kB Active(file): 15140 kB Inactive(file): 25296 kB Unevictable: 0 kB Mlocked: 0 kB SwapTotal: 0 kB SwapFree: 0 kB Dirty: 0 kB Writeback: 0 kB AnonPages: 8196 kB Mapped: 16448 kB Shmem: 296 kB Slab: 26832 kB SReclaimable: 6300 kB SUnreclaim: 20532 kB KernelStack: 3088 kB PageTables: 404 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 8171008 kB Committed_AS: 34336 kB VmallocTotal: 258998208 kB VmallocUsed: 0 kB VmallocChunk: 0 kB AnonHugePages: 0 kB CmaTotal: 204800 kB CmaFree: 6602584 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB
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