This failure means that an interrupt handler attempted to allocate memory with GFP_ATOMIC, but you're fresh out of memory. Specifically, your free memory is below 1/2 of the low watermark for ZONE normal. At this point, Linux's page allocator reports it's out of memory. Direct page reclamation (which would evict pages from their frames, freeing up some) also cannot take place since you're in an interrupt handler and specified GFP_ATOMIC.
Under normal operating condition, kswapd is designed to prevent this scenario from occurring by freeing paging before the low watermark is reached. I can only speculate what may be causing it, probably a combination of one or more of the following: - high frequency of network interrupts, resulting in many packets delivered and buffered - large memory usage by applications - kswapd not being scheduled/run - too little physical memory allocated in total. - Godmar On 9/6/07, Christopher S. Aker <[EMAIL PROTECTED]> wrote: > 2.6.21.1-um > > Mem-info: > Normal per-cpu: > CPU 0: Hot: hi: 90, btch: 15 usd: 14 Cold: hi: 30, btch: 7 usd: 24 > Active:62085 inactive:6442 dirty:4693 writeback:2791 unstable:0 > free:196 slab:3980 mapped:12235 pagetables:241 bounce:0 > Normal free:784kB min:2208kB low:2760kB high:3312kB active:248340kB > inactive:25768kB present:304800kB pages_scanned:1220 all_unreclaimable? no > lowmem_reserve[]: 0 > Normal: 0*4kB 0*8kB 1*16kB 0*32kB 0*64kB 0*128kB 1*256kB 1*512kB > 0*1024kB 0*2048kB 0*4096kB = 784kB > Swap cache: add 2548, delete 2451, find 38/63, race 0+0 > Free swap = 1037112kB > Total swap = 1046504kB > Free swap: 1037112kB > 76800 pages of RAM > 0 pages of HIGHMEM > 2795 reserved pages > 27381 pages shared > 97 pages swap cached > swapper: page allocation failure. order:0, mode:0x20 > 0858ba28: [<08065c76>] dump_stack+0x22/0x26 > 0858ba40: [<080a773f>] __alloc_pages+0x219/0x30d > 0858ba90: [<080bb4f3>] kmem_getpages+0x22/0x80 > 0858baa0: [<080bc2be>] cache_grow+0x166/0x180 > 0858bad8: [<080bc41c>] cache_alloc_refill+0x144/0x1c0 > 0858bb08: [<080bc7e3>] __kmalloc+0x6c/0x70 > 0858bb20: [<0835f5cd>] __alloc_skb+0x55/0x104 > 0858bb3c: [<0806b0f8>] uml_net_rx+0x38/0x161 > 0858bb64: [<0806b26e>] uml_net_interrupt+0x32/0x76 > 0858bb80: [<080a1297>] handle_IRQ_event+0x25/0x60 > 0858bb9c: [<080a1324>] __do_IRQ+0x52/0xa2 > 0858bbbc: [<080631d8>] do_IRQ+0x1f/0x32 > 0858bbc8: [<08062d4c>] sigio_handler+0x56/0x6a > 0858bbe0: [<08079114>] sig_handler_common_skas+0x94/0xe5 > 0858bc04: [<08075742>] sig_handler+0x32/0x53 > 0858bc1c: [<08077816>] hard_handler+0x1a/0x20 > 0858bc2c: [<08450828>] __restore+0x0/0x8 > 0858bf24: [<08064645>] default_idle+0x26/0x2f > 0858bf38: [<08067afd>] init_idle_skas+0x28/0x2f > 0858bf48: [<08064656>] cpu_idle+0x8/0xa > 0858bf50: [<0806211c>] rest_init+0x2c/0x30 > 0858bf64: [<0804876b>] start_kernel+0x1b1/0x212 > 0858bf84: [<08067b30>] start_kernel_proc+0x2c/0x32 > 0858bf90: [<08074f4d>] run_kernel_thread+0x50/0x57 > 0858bfcc: [<080678a7>] new_thread_handler+0x80/0xcd > 0858bffc: [<00000000>] nosmp+0xf7fb7f4c/0x14 > > Thoughts? > > Thanks, > -Chris > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Splunk Inc. > Still grepping through log files to find problems? Stop. > Now Search log events and configuration files using AJAX and a browser. > Download your FREE copy of Splunk now >> http://get.splunk.com/ > _______________________________________________ > User-mode-linux-devel mailing list > User-mode-linux-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel > ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
