Linux虚拟内存限制
Linux虚拟内存限制
提问于 2019-12-16 12:10:39
我正试图为进程(Tsw)分配内存。不幸的是，我不能分配超过1GB的虚拟内存(在for循环中分配2MB块)。在执行过程中没有限制更改命令。
下面是cat /proc/$(pidof Tsw)/limits命令的输出。
Limit Soft Limit Hard Limit Units
Max cpu time unlimited unlimited seconds
Max file size unlimited unlimited bytes
Max data size unlimited unlimited bytes
Max stack size 8388608 unlimited bytes
Max core file size 0 unlimited bytes
Max resident set unlimited unlimited bytes
Max processes 13633 13633 processes
Max open files 1024 4096 files
Max locked memory 65536 65536 bytes
Max address space unlimited unlimited bytes
Max file locks unlimited unlimited locks
Max pending signals 13633 13633 signals
Max msgqueue size 819200 819200 bytes
Max nice priority 0 0
Max realtime priority 0 0
Max realtime timeout unlimited unlimited us 下面是top命令的部分输出(注意：/usr/bin/Tsw，从顶部开始的第三个进程)：
Mem: 1082976K used, 990736K free, 0K shrd, 128K buff, 28136K cached
CPU: 0% usr 4% sys 0% nic 95% idle 0% io 0% irq 0% sirq
Load average: 1.07 0.36 0.13 1/242 2007
PID PPID USER STAT VSZ %VSZ %CPU COMMAND
1730 1690 root S 179m 9% 2% /usr/bin/btsvc_main_9300
585 1 root S 45784 2% 2% /usr/bin/brsCore --test-software
1691 1 root S 997m 49% 0% /usr/bin/Tsw
1941 1 root S 121m 6% 0% /usr/sbin/unifi_helper_tsw --wifi-ptest --wifi-char-device /dev/unifiudi0 --wifi-ptest-firmware ptest/firmware/ptest_unifi_93xx_a07_ptdl.xbv --wifi-ptest-profile ptest/profile/unitest_profile_CSRC9xxx_Cust_BGA.txt --log-level-text CsrWifiPtestApp..A
1687 1683 root S 119m 6% 0% /usr/sbin/unifi_helper_tsw --wifi-char-device /dev/unifi0 --wifi-on --wifi-restart-on-error --wifi-exit-on-error --wifi-exit-on-unplug --wifi-address 00:1C:C1:A2:5D:FF --wifi-mib --wifi-add-interface ff:ff:ff:ff:ff:ff
1693 1 root S 70452 3% 0% /usr/bin/avTSWCdspAudio.exe /usr/lib/audiomanager/routing/libavPluginRoutingDirana.so
1219 1 root S 66740 3% 0% /usr/bin/TSWNav_GNSS
1215 1 root S 63460 3% 0% /usr/bin/dlt-system -c /etc/dlt-system.conf
1039 1 root S 50464 2% 0% /usr/bin/avDiranaBoot.exe -t DIRANA3 -p /run/audio/dirana_boot.pipe -r 0 -d 0
1216 1 root S 48400 2% 0% /usr/bin/RadioAppTSW
1493 1 root S 47184 2% 0% /usr/bin/ssw_pers_pccl_hwi_svc
1494 1 root S 47180 2% 0% /usr/bin/ssw_pers_pccl_early_svc
1690 1 root S 35672 2% 0% /usr/bin/btsvc_main_9300
1692 1 root S 30516 1% 0% /usr/bin/tsw-apple-authic-info
1 0 root S 30060 1% 0% {systemd} /sbin/init
1225 1 root S 28224 1% 0% /usr/bin/TSWNav_Gyro
1224 1 root S 28220 1% 0% /usr/bin/TSWNav_Accel
1212 1 root S 26968 1% 0% /usr/bin/tsw-ipc-sample
793 1 root S 19532 1% 0% /usr/bin/ssw_pers_nba_svc
622 1 root S 6656 0% 0% /usr/lib/systemd/systemd-journald
1232 1 root S 4440 0% 0% /usr/sbin/sshd -D
746 1 root S 3448 0% 0% /usr/lib/systemd/systemd-udevd
2003 1691 root S 2960 0% 0% sh -c mount -o remount, rw / && cd usr/bin && top -b -n 1 > statistics_after.txt
2007 2003 root R 2960 0% 0% top -b -n 1
1682 30 root S 2960 0% 0% {unififw} /bin/sh /usr/sbin/unififw 0 2
1683 1682 root S 2960 0% 0% {unififw} /bin/sh /usr/sbin/unififw 0 2
1209 1 root S 2708 0% 0% /usr/bin/dlt-daemon
1694 1 root S 2660 0% 0% /usr/sbin/conn_wifi_tsw
1297 1 messageb S 2552 0% 0% /usr/bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation
1685 1682 root S 1820 0% 0% logger -t unififw -p daemon.notice
1625 1 root S 1816 0% 0% ldattach -8e1s 2000000 19 /dev/ttymxc1
1161 2 root SW 0 0% 0% [irq/65-2010000.]
8 2 root SW 0 0% 0% [rcu_preempt]
1629 2 root SW 0 0% 0% [hydra-sdio-io]
482 2 root SW 0 0% 0% [kworker/u8:2]
6 2 root SW 0 0% 0% [kworker/u8:0]
560 2 root SW 0 0% 0% [ubi_bgt0d]
1577 2 root SW 0 0% 0% [file_server_thr]
699 2 root SW 0 0% 0% [rtp_parser]
754 2 root SW 0 0% 0% [rtp_isr_data_th]
1464 2 root SW 0 0% 0% [mmcqd/1]
3 2 root SW 0 0% 0% [ksoftirqd/0]
701 2 root SW 0 0% 0% [rtp_write_threa]
755 2 root SW 0 0% 0% [spi_send_thread]
756 2 root SW 0 0% 0% [rtp_parser_thre]
1163 2 root SW 0 0% 0% [spi2]
1387 2 root SW 0 0% 0% [irq/54-mmc0]
1630 2 root SW 0 0% 0% [hydra/complete]
30 2 root SW 0 0% 0% [kworker/u8:1]
1210 2 root SW 0 0% 0% [kworker/0:2]
2 0 root SW 0 0% 0% [kthreadd]
4 2 root SW 0 0% 0% [kworker/0:0]
5 2 root SW< 0 0% 0% [kworker/0:0H]
7 2 root SW 0 0% 0% [migration/0]
9 2 root SW 0 0% 0% [rcu_bh]
10 2 root SW 0 0% 0% [rcu_sched]
11 2 root SW 0 0% 0% [watchdog/0]
12 2 root SW 0 0% 0% [watchdog/1]
13 2 root SW 0 0% 0% [migration/1]
14 2 root SW 0 0% 0% [ksoftirqd/1]
15 2 root SW 0 0% 0% [kworker/1:0]
16 2 root SW< 0 0% 0% [kworker/1:0H]
17 2 root SW 0 0% 0% [watchdog/2]
18 2 root SW 0 0% 0% [migration/2]
19 2 root SW 0 0% 0% [ksoftirqd/2]
20 2 root SW 0 0% 0% [kworker/2:0]
21 2 root SW< 0 0% 0% [kworker/2:0H]
22 2 root SW 0 0% 0% [watchdog/3]
23 2 root SW 0 0% 0% [migration/3]
24 2 root SW 0 0% 0% [ksoftirqd/3]
25 2 root SW 0 0% 0% [kworker/3:0]
26 2 root SW< 0 0% 0% [kworker/3:0H]
27 2 root SW< 0 0% 0% [khelper]
28 2 root SW 0 0% 0% [kdevtmpfs]
29 2 root SW< 0 0% 0% [netns]
37 2 root SW 0 0% 0% [kworker/0:1]
38 2 root SW 0 0% 0% [kworker/1:1]
39 2 root SW 0 0% 0% [kworker/2:1]
40 2 root SW 0 0% 0% [kworker/3:1]
241 2 root SW< 0 0% 0% [writeback]
243 2 root SW< 0 0% 0% [bioset]
245 2 root SW< 0 0% 0% [kblockd]
279 2 root SW 0 0% 0% [khubd]
307 2 root SW 0 0% 0% [ipu1_task]
308 2 root SW 0 0% 0% [ipu1_task]
309 2 root SW 0 0% 0% [ipu2_task]
310 2 root SW 0 0% 0% [ipu2_task]
343 2 root SW 0 0% 0% [kswapd0]
402 2 root SW 0 0% 0% [fsnotify_mark]
406 2 root SW< 0 0% 0% [crypto]
416 2 root SW< 0 0% 0% [shm_workqueue]
429 2 root SW 0 0% 0% [kworker/2:2]
474 2 root SW< 0 0% 0% [usbdiag_queue]
481 2 root SW< 0 0% 0% [ci_otg]
511 2 root SW< 0 0% 0% [deferwq]
544 2 root SW 0 0% 0% [gpmi_statistics]
700 2 root SW< 0 0% 0% [rtp_admin]
753 2 root SW 0 0% 0% [spi0]
795 2 root SW 0 0% 0% [kworker/1:2]
1040 2 root SW 0 0% 0% [kworker/3:2]
1152 2 root SW 0 0% 0% [spi1]
1177 2 root SW 0 0% 0% [spi4]
1269 2 root SW< 0 0% 0% [vpu_wq]
1406 2 root SW 0 0% 0% [ubifs_bgt0_60]
1409 2 root SW 0 0% 0% [irq/56-mmc1]
1413 2 root SW 0 0% 0% [kworker/u8:3]
1465 2 root SW 0 0% 0% [mmcqd/1boot0]
1466 2 root SW 0 0% 0% [mmcqd/1boot1]
1467 2 root SW 0 0% 0% [mmcqd/1rpmb]
1480 2 root SW< 0 0% 0% [kworker/0:1H]
1482 2 root SW< 0 0% 0% [kworker/2:1H]
1486 2 root SW< 0 0% 0% [kworker/1:1H]
1533 2 root SW 0 0% 0% [jbd2/mmcblk1p3-]
1534 2 root SW< 0 0% 0% [ext4-dio-unwrit]
1536 2 root SW 0 0% 0% [jbd2/mmcblk1p2-]
1537 2 root SW< 0 0% 0% [ext4-dio-unwrit]
1578 2 root SW< 0 0% 0% [coredump_wq]
1631 2 root SW 0 0% 0% [service_mgr_thr]
1679 2 root SW< 0 0% 0% [unifi_workq]
1717 2 root SW 0 0% 0% [ubifs_bgt0_50]
1758 2 root SW 0 0% 0% [ubifs_bgt0_17]
1759 2 root SW 0 0% 0% [UNIFI_BH]
1766 2 root SW 0 0% 0% [hydra/complete]
1936 2 root SW 0 0% 0% [reader]
1937 2 root SW 0 0% 0% [writer]下面是我分配的方法：
// RAM_SIZE = 1.5 Gb
// RAM_BLOCK_TEST = 2 Mb
#define RAM_SIZE (1024U * 1024U * 1536U)
#define RAM_BLOCK_TEST (1024U * 1024U * 2U)
uint32_t uiMemBlockCount = 0;
// uiLoopNr = 768
uint32_t uiLoopNr = (uint32_t)RAM_SIZE/(uint32_t)RAM_BLOCK_TEST;
uint8_t* pcMemArray[uiLoopNr];
for(uiMemBlockCount = 0; uiMemBlockCount < uiLoopNr; uiMemBlockCount++)
{
pcMemArray[uiMemBlockCount] = (uint8_t*)calloc(RAM_BLOCK_TEST, sizeof(uint8_t));
if (NULL == pcMemArray[uiMemBlockCount])
{
printf("Allocated %u block(s) of memory with %d size", uiMemBlockCount, RAM_BLOCK_TEST);
break;
}
}也许Linux操作系统中还有其他限制不允许我这样做呢？谢谢!
回答 1
Stack Overflow用户
回答已采纳
发布于 2019-12-17 13:59:08
我发现了这个问题。
Virtual kernel memory layout:
vector : 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
vmalloc : 0xc0800000 - 0xff000000 (1000 MB)
lowmem : 0x40000000 - 0xc0000000 (2048 MB)
modules : 0x3f000000 - 0x40000000 ( 16 MB)
.text : 0x40008000 - 0x40411ef4 (4136 kB)
.init : 0x40412000 - 0x4043ce80 ( 172 kB)
.data : 0x4043e000 - 0x404607c0 ( 138 kB)
.bss : 0x404607c0 - 0x40498208 ( 223 kB)最低起点为0x40000000。
因此，每个进程的虚拟内存不能超过1GB。
这可以在内核配置中使用CONFIG_PAGE_OFFSET进行更改。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/59356408
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