减小linux内核大小的配置选项

 

linux内核现在是越来越大,以前kernel+rootfs一张软盘都能放下,现在光放内核都不行了,

要减小linux内核的大小,可以通过Linux-tiny patches补丁来实现,当然还有一些其他的配置选项,

 

CONFIG optionDescriptionDefaultSmallCONFIG_CORE_SMALL tune some kernel data sizes N YCONFIG_NET_SMALL tune some net-related data sizes N YCONFIG_KMALLOC_ACCOUNTINGturn on kmalloc accounting N Y *CONFIG_AUDIT_BOOTMEM print out all bootmem allocations N Y *CONFIG_DEPRECATE_INLINEScause compiler to emit info about inlines N Y *CONFIG_PRINTK allow disable of printk code and message data Y NCONFIG_BUG allow elimination of BUG (and BUG_ON??) code Y NCONFIG_ELF_CORE allow disabling of ELF core dumps Y NCONFIG_PROC_KCORE allow disabling of /proc/kcore Y NCONFIG_AIO allow disabling of async IO syscalls Y NCONFIG_XATTR allow disabling of xattr syscalls Y NCONFIG_FILE_LOCKING allow disabling of file locking syscalls Y NCONFIG_DIRECTIO allow disabling of direct IO support Y NCONFIG_MAX_SWAPFILES_SHIFTnumber of swapfiles 5 0CONFIG_NR_LDISCS number of tty line disciplines 16 2CONFIG_MAX_USER_RT_PRIOnumber of RT priority levels (schedule slots)100 5Other config options These are not in Linux-tiny, but help with sizedefaultsmallCONFIG_KALLSYMS load all symbols for debugging/kksymoops Y NCONFIG_SHMEM allow disabling of shmem filesystem Y N +CONFIG_SWAP allow disabling of support for a swap segment (virtual memory)Y NCONFIG_SYSV_IPC allow disabling of support for System V IPC Y N +CONFIG_POSIX_MQUEUE allow disabling of POSIX message queue supportY N +CONFIG_SYSCTL allow disabling of sysctl support Y N +CONFIG_LOG_BUF_SHIFT control size of kernel printk buffer 14 11CONFIG_UID16 allow support for 16-bit uids Y ??CONFIG_CC_OPTIMIZE_FOR_SIZEUse gcc -os to optimize for size Y YCONFIG_MODULES allow support for kernel loadable modules Y N +CONFIG_KMOD allow support for automatic kernel module loadingY NCONFIG_PCI allow support for PCI bus and devices Y Y -CONFIG_XIP_KERNEL allow support for kernel Execute-in-Place N NCONFIG_MAX_RESERVE_AREA?? ?? ??CONFIG_BLK_DEV_LOOP support for loopback block device Y Y -CONFIG_BLK_DEV_RAM support for block devices for RAM filesystems Y Y -CONFIG_BLK_DEV_RAM_COUNTNumber of block devices for RAM filesystems 16 2?CONFIG_BLK_DEV_RAM_SIZESize of block device struct for RAM filesystems4096??CONFIG_IOSCHED_AS Include Anticipatory IO scheduler Y YCONFIG_IOSCHED_DEADLINEInclude Deadline IO scheduler Y N +CONFIG_IOSCHED_CFQ Include CFQ IO scheduler Y N +CONFIG_IP_PNP support for IP autoconfiguration Y N +CONFIG_IP_PNP_DHCP support for IP autoconfiguration via DHCP Y N +CONFIG_IDE support for IDE devices Y N +CONFIG_SCSI support for SCSI devices Y N +

Legend:

• "Y *" - Set to 'Y' for measurement during development, and set to 'N' for deployment.
• "N +" - Whether you can set this to 'N' depends on whether this feaure is needed by your applications.
• "Y -" - You probably need this, but it might we worth checking to see if you don't.