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With the recent changes to bypass loading the file it's possible to reduce the work in userspace and delegating it to the kernel. Without any compression to illustrate: Before: read(3, "\177ELF\2\1", 6) = 6 lseek(3, 0, SEEK_SET) = 0 newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=238592, ...}, AT_EMPTY_PATH) = 0 mmap(NULL, 238592, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fd85cbd1000 finit_module(3, "", 0) = 0 munmap(0x7fd85cbd1000, 238592) = 0 close(3) = 0 After: read(3, "\177ELF\2\1", 6) = 6 lseek(3, 0, SEEK_SET) = 0 finit_module(3, "", 0) = 0 close(3) = 0 When using kernel compression now it's also possible to direct libkmod to take the finit_module() path, avoiding the decompression in userspace and just delegating it to the kernel. Before: read(3, "(\265/\375\244\0", 6) = 6 lseek(3, 0, SEEK_SET) = 0 read(3, "(\265/\375\244", 5) = 5 mmap(NULL, 135168, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f3fa431e000 read(3, "\0\244\3\0\\y\6", 7) = 7 mmap(NULL, 372736, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f3fa414f000 brk(0x55944c6a1000) = 0x55944c6a1000 read(3, "\356|\6G\27U\20 \312\260s\211\335\333\263\326\330\336\273O\211\356\306K\360Z\341\374U6\342\221"..., 53038) = 53038 mremap(0x7f3fa431e000, 135168, 266240, MREMAP_MAYMOVE) = 0x7f3fa410e000 read(3, ",;\3\nqf\311\362\325\211\7\341\375A\355\221\371L\\\5\7\375 \32\246<(\258=K\304"..., 20851) = 20851 mremap(0x7f3fa410e000, 266240, 397312, MREMAP_MAYMOVE) = 0x7f3fa40ad000 read(3, ")\36\250\213", 4) = 4 read(3, "", 4) = 0 munmap(0x7f3fa414f000, 372736) = 0 init_module(0x7f3fa40ad010, 238592, "") = 0 munmap(0x7f3fa40ad000, 397312) = 0 close(3) = 0 After: read(3, "(\265/\375\244P", 6) = 6 lseek(3, 0, SEEK_SET) = 0 finit_module(3, "", 0x4 /* MODULE_INIT_??? */) = 0 close(3) = 0 Signed-off-by: Lucas De Marchi <lucas.de.marchi@gmail.com> |
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.. | ||
docs | ||
python | ||
.gitignore | ||
COPYING | ||
libkmod-builtin.c | ||
libkmod-config.c | ||
libkmod-elf.c | ||
libkmod-file.c | ||
libkmod-index.c | ||
libkmod-index.h | ||
libkmod-internal.h | ||
libkmod-list.c | ||
libkmod-module.c | ||
libkmod-signature.c | ||
libkmod.c | ||
libkmod.h | ||
libkmod.pc.in | ||
libkmod.sym | ||
Makefile | ||
README |
libkmod - linux kernel module handling library ABSTRACT ======== libkmod was created to allow programs to easily insert, remove and list modules, also checking its properties, dependencies and aliases. there is no shared/global context information and it can be used by multiple sites on a single program, also being able to be used from threads, although it's not thread safe (you must lock explicitly). OVERVIEW ======== Every user should create and manage it's own library context with: struct kmod_ctx *ctx = kmod_new(kernel_dirname); kmod_unref(ctx); Modules can be created by various means: struct kmod_module *mod; int err; err = kmod_module_new_from_path(ctx, path, &mod); if (err < 0) { /* code */ } else { /* code */ kmod_module_unref(mod); } err = kmod_module_new_from_name(ctx, name, &mod); if (err < 0) { /* code */ } else { /* code */ kmod_module_unref(mod); } Or could be resolved from a known alias to a list of alternatives: struct kmod_list *list, *itr; int err; err = kmod_module_new_from_lookup(ctx, alias, &list); if (err < 0) { /* code */ } else { kmod_list_foreach(itr, list) { struct kmod_module *mod = kmod_module_get_module(itr); /* code */ } }