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/tools/perf/Documentation/
Dperf.data-directory-format.txt31 the --kcore option which puts a copy of /proc/kcore into the directory.
34 $ sudo perf record --kcore uname
43 ├── [-r-------- 40230912] kcore
53 Using perf.data/kcore_dir/kcore for kernel data
Dperf-buildid-cache.txt31 --kcore::
32 Add specified kcore file to the cache. For the current host that is
33 /proc/kcore which requires root permissions to read. Be aware that
39 permissions for root only. kcore will not be added if there is already a
40 kcore in the cache (with the same build-id) that has the same modules at
41 the same addresses. Use the -v option to see if a copy of kcore is
Dperf-intel-pt.txt70 code. A fairly good kernel image is available in /proc/kcore but to get an
71 accurate image a copy of /proc/kcore needs to be made under the same conditions
72 as the data capture. 'perf record' can make a copy of /proc/kcore if the option
73 --kcore is used, but access to /proc/kcore is restricted e.g.
75 sudo perf record -o pt_ls --kcore -e intel_pt// -- ls
78 simply 'data') and copies of /proc/kcore, /proc/kallsyms and /proc/modules into
1279 …hfs needs -o direct_io to enable reading of proc files. root access is needed to read /proc/kcore.
1284 Copy the guest /proc/kallsyms, /proc/modules and /proc/kcore
1286 $ perf buildid-cache -v --kcore vm0/proc/kcore
1287 …kcore added to build-id cache directory /home/user/.debug/[kernel.kcore]/9600f316a53a0f54278885e8d…
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Dperf-record.txt701 --kcore::
702 Make a copy of /proc/kcore and place it into a directory with the perf data file.
Dperf-config.txt233 and /proc/kcore files to be used at analysis time.
/tools/perf/util/
Dsymbol-elf.c1986 struct kcore { struct
1993 static int kcore__open(struct kcore *kcore, const char *filename) in kcore__open() argument
1997 kcore->fd = open(filename, O_RDONLY); in kcore__open()
1998 if (kcore->fd == -1) in kcore__open()
2001 kcore->elf = elf_begin(kcore->fd, ELF_C_READ, NULL); in kcore__open()
2002 if (!kcore->elf) in kcore__open()
2005 kcore->elfclass = gelf_getclass(kcore->elf); in kcore__open()
2006 if (kcore->elfclass == ELFCLASSNONE) in kcore__open()
2009 ehdr = gelf_getehdr(kcore->elf, &kcore->ehdr); in kcore__open()
2016 elf_end(kcore->elf); in kcore__open()
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Drecord.h52 bool kcore; member
/tools/perf/
Dbuiltin-record.c990 char kcore[PATH_MAX]; in record__kcore_readable() local
993 scnprintf(kcore, sizeof(kcore), "%s/proc/kcore", machine->root_dir); in record__kcore_readable()
995 fd = open(kcore, O_RDONLY); in record__kcore_readable()
2448 if (rec->opts.kcore && in __cmd_record()
2497 if (rec->opts.kcore) { in __cmd_record()
3453 OPT_BOOLEAN(0, "kcore", &record.opts.kcore, "copy /proc/kcore"),
4041 if (rec->opts.kcore) in cmd_record()
4044 if (rec->opts.kcore || record__threads_enabled(rec)) in cmd_record()