* pahole and parsing data: --count [not found] ` <0eae329c-d448-4d04-c240-0850a93278a5-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> @ 2020-07-01 11:25 ` Arnaldo Carvalho de Melo [not found] ` <20200701112534.GQ29008-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> 0 siblings, 1 reply; 3+ messages in thread From: Arnaldo Carvalho de Melo @ 2020-07-01 11:25 UTC (permalink / raw) To: dwarves-u79uwXL29TY76Z2rM5mHXA; +Cc: Joe Lawrence Hi, I've been implementing pretty printing in pahole: [acme@quaco pahole]$ git log --oneline v1.17.. 5631fdcea1bb (HEAD -> master, acme.korg/pretty, acme.korg/master) pahole: Introduce --count, just like dd's 272bc75024b4 man-pages: Add information about stdin raw data pretty printing 66835f9e190c pahole: Add support for base type arrays 1a67d6e70090 pahole: Factor out base_type__fprintf_value() 6fb98aa1209f pahole: Support char arrays when dumping from stdin a231d00f8d08 pahole: Print comma at the end of field name + field value 1b2cdda38c0a dwarves: Introduce tag__is_array() a83313fb2252 pahole: Pretty print base types in structs from stdin cc65946e3068 dwarves: Adopt tag__is_base_type() from ctrace.c d8079c6d373a pahole: Hex dump a type from stdio when it isn't a tty 38109ab45fe0 spec: Fix date [acme@quaco pahole]$ The latest changeset shows what this is about, see its example below, please help testing and suggesting whatever needs you have regarding pretty printing. Now to implement --skip. Regards, - Arnaldo From 5631fdcea1bbe2bcb8c673ff0bb0fdc9fdc2875d Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo <acme-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> Date: Wed, 1 Jul 2020 08:14:58 -0300 Subject: [PATCH] pahole: Introduce --count, just like dd's $ objcopy -O binary --only-section=.altinstructions ~/git/build/v5.7-rc2+/vmlinux .altinstructions $ pahole --count 2 alt_instr < .altinstructions { .instr_offset = 0xffffffffffe0e690, .repl_offset = 0x4873, .cpuid = 0x70, .instrlen = 0x5, .replacementlen = 0x5, .padlen = 0, }, { .instr_offset = 0xffffffffffe0e683, .repl_offset = 0x486b, .cpuid = 0x129, .instrlen = 0x5, .replacementlen = 0x5, .padlen = 0, }, $ Signed-off-by: Arnaldo Carvalho de Melo <acme-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> --- dwarves.h | 2 ++ man-pages/pahole.1 | 8 +++++++- pahole.c | 13 +++++++++++++ 3 files changed, 22 insertions(+), 1 deletion(-) diff --git a/dwarves.h b/dwarves.h index 0170f251bcd4..f224d05b28c3 100644 --- a/dwarves.h +++ b/dwarves.h @@ -54,6 +54,7 @@ struct conf_load { /** struct conf_fprintf - hints to the __fprintf routines * + * @count - Just like 'dd', stop pretty printing input after 'count' records * @flat_arrays - a->foo[10][2] becomes a->foo[20] * @classes_as_structs - class f becomes struct f, CTF doesn't have a "class" * @cachelinep - pointer to current cacheline, so that when expanding types we keep track of it, @@ -68,6 +69,7 @@ struct conf_fprintf { int32_t type_spacing; int32_t name_spacing; uint32_t base_offset; + uint32_t count; uint32_t *cachelinep; uint8_t indent; uint8_t expand_types:1; diff --git a/man-pages/pahole.1 b/man-pages/pahole.1 index 26c14cb6fd2c..7e8207756432 100644 --- a/man-pages/pahole.1 +++ b/man-pages/pahole.1 @@ -60,6 +60,8 @@ See the EXAMPLES section for more usage suggestions. It also pretty prints whatever is fed to its standard input, according to the type specified, see the EXAMPLE session. +Use --count to state how many records should be pretty printed. + .SH OPTIONS pahole supports the following options. @@ -72,6 +74,10 @@ or file URLs (e.g.: file://class_list.txt) .B \-c, \-\-cacheline_size=SIZE Set cacheline size to SIZE bytes. +.TP +.B \-\-count=COUNT +Pretty print the first COUNT records from input. + .TP .B \-E, \-\-expand_types Expand class members. Useful to find in what member of inner structs where an @@ -482,7 +488,7 @@ $ $ ls -la versions -rw-rw-r--. 1 acme acme 7616 Jun 25 11:33 versions $ -$ pahole -C modversion_info drivers/scsi/sg.ko < versions | head -12 +$ pahole --count 3 -C modversion_info drivers/scsi/sg.ko < versions { .crc = 0x8dabd84, .name = "module_layout", diff --git a/pahole.c b/pahole.c index 03909525bf15..1b84f5c2fa4a 100644 --- a/pahole.c +++ b/pahole.c @@ -802,6 +802,7 @@ ARGP_PROGRAM_VERSION_HOOK_DEF = dwarves_print_version; #define ARGP_suppress_packed 308 #define ARGP_just_unions 309 #define ARGP_just_structs 310 +#define ARGP_count 311 static const struct argp_option pahole__options[] = { { @@ -822,6 +823,12 @@ static const struct argp_option pahole__options[] = { .arg = "CLASS_NAME", .doc = "Show just this class" }, + { + .name = "count", + .key = ARGP_count, + .arg = "COUNT", + .doc = "Print only COUNT input records" + }, { .name = "find_pointers_to", .key = 'f', @@ -1145,6 +1152,8 @@ static error_t pahole__options_parser(int key, char *arg, just_unions = true; break; case ARGP_just_structs: just_structs = true; break; + case ARGP_count: + conf.count = atoi(arg); break; default: return ARGP_ERR_UNKNOWN; } @@ -1315,6 +1324,7 @@ static int tag__stdio_fprintf_value(struct tag *type, struct cu *cu, FILE *fp) { int _sizeof = tag__size(type, cu), printed = 0; void *instance = malloc(_sizeof); + uint32_t count = 0; if (instance == NULL) return -ENOMEM; @@ -1322,6 +1332,9 @@ static int tag__stdio_fprintf_value(struct tag *type, struct cu *cu, FILE *fp) while (fread(instance, _sizeof, 1, stdin) == 1) { printed += tag__fprintf_value(type, cu, instance, _sizeof, fp); printed += fprintf(fp, ",\n"); + + if (conf.count && ++count == conf.count) + break; } return printed; -- 2.21.3 ^ permalink raw reply related [flat|nested] 3+ messages in thread
[parent not found: <20200701112534.GQ29008-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>]
* pahole and parsing data: --skip [not found] ` <20200701112534.GQ29008-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> @ 2020-07-01 11:44 ` Arnaldo Carvalho de Melo [not found] ` <20200701114421.GR29008-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> 0 siblings, 1 reply; 3+ messages in thread From: Arnaldo Carvalho de Melo @ 2020-07-01 11:44 UTC (permalink / raw) To: dwarves-u79uwXL29TY76Z2rM5mHXA; +Cc: Joe Lawrence, Jiri Olsa, Namhyung Kim Em Wed, Jul 01, 2020 at 08:25:34AM -0300, Arnaldo Carvalho de Melo escreveu: > The latest changeset shows what this is about, see its example > below, please help testing and suggesting whatever needs you have > regarding pretty printing. > > Now to implement --skip. Now to implement --seek, this time in bytes, so that we can, for instance, pretty print perf.data records, looking at 'perf report -D' and getting the offset of the start of a series of 'struct perf_event_attr' or 'struct perf_event_header'. - Arnaldo commit 44af7c02b5d0a7f2b93fab9fda45907cd6fe0827 Author: Arnaldo Carvalho de Melo <acme-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> Date: Wed Jul 1 08:36:28 2020 -0300 pahole: Implement --skip, just like dd $ objcopy -O binary --only-section=__versions drivers/scsi/sg.ko versions $ pahole -C modversion_info drivers/scsi/sg.ko struct modversion_info { long unsigned int crc; /* 0 8 */ char name[56]; /* 8 56 */ /* size: 64, cachelines: 1, members: 2 */ }; $ pahole --count 3 -C modversion_info drivers/scsi/sg.ko < versions { .crc = 0x8dabd84, .name = "module_layout", }, { .crc = 0x45e4617b, .name = "no_llseek", }, { .crc = 0xa23fae8c, .name = "param_ops_int", }, $ pahole --skip 1 --count 2 -C modversion_info drivers/scsi/sg.ko < versions { .crc = 0x45e4617b, .name = "no_llseek", }, { .crc = 0xa23fae8c, .name = "param_ops_int", }, $ Signed-off-by: Arnaldo Carvalho de Melo <acme-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> diff --git a/dwarves.h b/dwarves.h index f224d05b28c3..24f9c7c37843 100644 --- a/dwarves.h +++ b/dwarves.h @@ -55,6 +55,7 @@ struct conf_load { /** struct conf_fprintf - hints to the __fprintf routines * * @count - Just like 'dd', stop pretty printing input after 'count' records + * @skip - Just like 'dd', skip 'count' records when pretty printing input * @flat_arrays - a->foo[10][2] becomes a->foo[20] * @classes_as_structs - class f becomes struct f, CTF doesn't have a "class" * @cachelinep - pointer to current cacheline, so that when expanding types we keep track of it, @@ -71,6 +72,7 @@ struct conf_fprintf { uint32_t base_offset; uint32_t count; uint32_t *cachelinep; + uint32_t skip; uint8_t indent; uint8_t expand_types:1; uint8_t expand_pointers:1; diff --git a/man-pages/pahole.1 b/man-pages/pahole.1 index 7e8207756432..db820cca323f 100644 --- a/man-pages/pahole.1 +++ b/man-pages/pahole.1 @@ -78,6 +78,10 @@ Set cacheline size to SIZE bytes. .B \-\-count=COUNT Pretty print the first COUNT records from input. +.TP +.B \-\-skip=COUNT +Skip COUNT input records. + .TP .B \-E, \-\-expand_types Expand class members. Useful to find in what member of inner structs where an @@ -502,6 +506,16 @@ $ pahole --count 3 -C modversion_info drivers/scsi/sg.ko < versions .name = "param_ops_int", }, $ +$ pahole --skip 1 --count 2 -C modversion_info drivers/scsi/sg.ko < versions +{ + .crc = 0x45e4617b, + .name = "no_llseek", +}, +{ + .crc = 0xa23fae8c, + .name = "param_ops_int", +}, +$ .fi .P diff --git a/pahole.c b/pahole.c index 1b84f5c2fa4a..7d8431c64423 100644 --- a/pahole.c +++ b/pahole.c @@ -803,6 +803,7 @@ ARGP_PROGRAM_VERSION_HOOK_DEF = dwarves_print_version; #define ARGP_just_unions 309 #define ARGP_just_structs 310 #define ARGP_count 311 +#define ARGP_skip 312 static const struct argp_option pahole__options[] = { { @@ -829,6 +830,12 @@ static const struct argp_option pahole__options[] = { .arg = "COUNT", .doc = "Print only COUNT input records" }, + { + .name = "skip", + .key = ARGP_skip, + .arg = "COUNT", + .doc = "Skip COUNT input records" + }, { .name = "find_pointers_to", .key = 'f', @@ -1154,6 +1161,8 @@ static error_t pahole__options_parser(int key, char *arg, just_structs = true; break; case ARGP_count: conf.count = atoi(arg); break; + case ARGP_skip: + conf.skip = atoi(arg); break; default: return ARGP_ERR_UNKNOWN; } @@ -1325,11 +1334,17 @@ static int tag__stdio_fprintf_value(struct tag *type, struct cu *cu, FILE *fp) int _sizeof = tag__size(type, cu), printed = 0; void *instance = malloc(_sizeof); uint32_t count = 0; + uint32_t skip = conf.skip; if (instance == NULL) return -ENOMEM; while (fread(instance, _sizeof, 1, stdin) == 1) { + if (skip) { + --skip; + continue; + } + printed += tag__fprintf_value(type, cu, instance, _sizeof, fp); printed += fprintf(fp, ",\n"); ^ permalink raw reply related [flat|nested] 3+ messages in thread
[parent not found: <20200701114421.GR29008-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>]
* pahole and parsing data: --seek_bytes, dissecting perf.data files [not found] ` <20200701114421.GR29008-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> @ 2020-07-01 12:46 ` Arnaldo Carvalho de Melo 0 siblings, 0 replies; 3+ messages in thread From: Arnaldo Carvalho de Melo @ 2020-07-01 12:46 UTC (permalink / raw) To: dwarves-u79uwXL29TY76Z2rM5mHXA Cc: Joe Lawrence, Jiri Olsa, Namhyung Kim, Andrii Nakryiko, Song Liu Em Wed, Jul 01, 2020 at 08:44:21AM -0300, Arnaldo Carvalho de Melo escreveu: > Em Wed, Jul 01, 2020 at 08:25:34AM -0300, Arnaldo Carvalho de Melo escreveu: > > The latest changeset shows what this is about, see its example > > below, please help testing and suggesting whatever needs you have > > regarding pretty printing. > > > > Now to implement --skip. > Now to implement --seek, this time in bytes, so that we can, for > instance, pretty print perf.data records, looking at 'perf report -D' > and getting the offset of the start of a series of 'struct > perf_event_attr' or 'struct perf_event_header'. Here it is with more complex examples dissecting perf.data file data structures, including BPF related structs: commit fe284221448c950d2ba17bce91d19c484d6580a0 Author: Arnaldo Carvalho de Melo <acme-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> Date: Wed Jul 1 09:17:38 2020 -0300 pahole: Introduce --seek_bytes Works with stdio, will work with files where we'll use plain lseek and allow for pretty printing trailer structs. E.g.: $ objcopy -O binary --only-section=__versions drivers/scsi/sg.ko versions $ pahole -C modversion_info drivers/scsi/sg.ko struct modversion_info { long unsigned int crc; /* 0 8 */ char name[56]; /* 8 56 */ /* size: 64, cachelines: 1, members: 2 */ }; $ pahole --count 2 -C modversion_info drivers/scsi/sg.ko < versions { .crc = 0x8dabd84, .name = "module_layout", }, { .crc = 0x45e4617b, .name = "no_llseek", }, $ pahole --skip 1 --count 1 -C modversion_info drivers/scsi/sg.ko < versions { .crc = 0x45e4617b, .name = "no_llseek", }, Then the equivalent, skipping sizeof(modversion_info) explicitely: $ pahole --seek_bytes 64 --count 1 -C modversion_info drivers/scsi/sg.ko < versions { .crc = 0x45e4617b, .name = "no_llseek", }, $ Using a perf.data file generated by 'perf record': $ perf report -D | head -18 # To display the perf.data header info, please use --header/--header-only options. # 0x130 [0x20]: event: 79 . . ... raw event: size 32 bytes . 0000: 4f 00 00 00 00 00 20 00 1f 00 00 00 00 00 00 00 O..... ......... . 0010: 31 30 9b 3c 00 00 00 00 2e 53 f8 0c 52 8c 01 00 10.<.....S�.R... 0 0x130 [0x20]: PERF_RECORD_TIME_CONV: unhandled! 0x150 [0x28]: event: 73 . . ... raw event: size 40 bytes . 0000: 49 00 00 00 00 00 28 00 01 00 00 00 00 00 00 00 I.....(......... . 0010: 50 7e 00 00 00 00 00 00 00 00 00 00 00 00 00 00 P~.............. . 0020: 00 00 00 00 00 00 00 00 ........ $ pahole --seek_bytes 0x130 --count 1 -C perf_event_header < perf.data { .type = 0x4f, .misc = 0, .size = 0x20, }, $ printf "0x%x\n" 79 0x4f $ pahole --seek_bytes 0x150 --count 1 -C perf_event_header < perf.data { .type = 0x49, .misc = 0, .size = 0x28, }, $ printf "0x%x\n" 73 0x49 $ Now to use more complex types, again using perf.data files. # perf record -a sleep 1 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 3.834 MB perf.data (31853 samples) ] # perf report -D | grep -m1 -B20 PERF_RECORD_BPF 0x6aa0 [0x58]: event: 17 . . ... raw event: size 88 bytes . 0020: 5f 37 62 65 34 39 65 33 39 33 34 61 31 32 35 62 _7be49e3934a125b . 0030: 61 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a............... . 0040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ . 0050: 00 00 00 00 00 00 00 00 ........ 0 0 0x6aa0 [0x58]: PERF_RECORD_KSYMBOL addr ffffffffc03e0e90 len 203 type 1 flags 0x0 name bpf_prog_7be49e3934a125ba 0x6af8 [0x38]: event: 18 . . ... raw event: size 56 bytes . 0000: 12 00 00 00 00 00 38 00 01 00 00 00 11 00 00 00 ......8......... . 0020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ . 0030: 00 00 00 00 00 00 00 00 ........ 0 0 0x6af8 [0x38]: PERF_RECORD_BPF_EVENT type 1, flags 0, id 17 Binary file (standard input) matches # pahole -C perf_record_bpf_event ~/bin/perf struct perf_record_bpf_event { struct perf_event_header header; /* 0 8 */ __u16 type; /* 8 2 */ __u16 flags; /* 10 2 */ __u32 id; /* 12 4 */ __u8 tag[8]; /* 16 8 */ /* size: 24, cachelines: 1, members: 5 */ /* last cacheline: 24 bytes */ }; # pahole -C perf_record_bpf_event --seek_bytes 0x6af8 --count 1 ~/bin/perf < perf.data { .header = 0x12 0x00 0x00 0x00 0x00 0x00 0x38 0x00, .type = 0x1, .flags = 0, .id = 0x11, .tag = { 0, 0, 0, 0, 0, 0, 0, 0}, }, # printf "0x%x\n" 18 0x12 # pahole -C perf_record_ksymbol ~/bin/perf struct perf_record_ksymbol { struct perf_event_header header; /* 0 8 */ __u64 addr; /* 8 8 */ __u32 len; /* 16 4 */ __u16 ksym_type; /* 20 2 */ __u16 flags; /* 22 2 */ char name[256]; /* 24 256 */ /* size: 280, cachelines: 5, members: 6 */ /* last cacheline: 24 bytes */ }; # pahole -C perf_record_ksymbol --seek_bytes 0x6aa0 --count 1 ~/bin/perf < perf.data { .header = 0x11 0x00 0x00 0x00 0x00 0x00 0x58 0x00, .addr = 0xffffffffc03e0e90, .len = 0xcb, .ksym_type = 0x1, .flags = 0, .name = "bpf_prog_7be49e3934a125ba", }, # printf "0x%x\n" 17 0x11 # Need to recursively pretty print substructs, but all seems to work with the simple hexdump. Signed-off-by: Arnaldo Carvalho de Melo <acme-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> diff --git a/dwarves.h b/dwarves.h index 24f9c7c37843..1b118d03ec15 100644 --- a/dwarves.h +++ b/dwarves.h @@ -13,6 +13,7 @@ #include <obstack.h> #include <dwarf.h> #include <elfutils/libdwfl.h> +#include <sys/types.h> #include "dutil.h" #include "list.h" @@ -56,6 +57,7 @@ struct conf_load { * * @count - Just like 'dd', stop pretty printing input after 'count' records * @skip - Just like 'dd', skip 'count' records when pretty printing input + * @seek_bytes - Number of bytes to seek, if stdin only from start, when we have --pretty FILE, then from the end as well with negative numbers * @flat_arrays - a->foo[10][2] becomes a->foo[20] * @classes_as_structs - class f becomes struct f, CTF doesn't have a "class" * @cachelinep - pointer to current cacheline, so that when expanding types we keep track of it, @@ -72,6 +74,7 @@ struct conf_fprintf { uint32_t base_offset; uint32_t count; uint32_t *cachelinep; + off_t seek_bytes; uint32_t skip; uint8_t indent; uint8_t expand_types:1; diff --git a/man-pages/pahole.1 b/man-pages/pahole.1 index db820cca323f..ad4e92d716cf 100644 --- a/man-pages/pahole.1 +++ b/man-pages/pahole.1 @@ -516,6 +516,14 @@ $ pahole --skip 1 --count 2 -C modversion_info drivers/scsi/sg.ko < versions .name = "param_ops_int", }, $ +This is equivalent to: + +$ pahole --seek_bytes 64 --count 1 -C modversion_info drivers/scsi/sg.ko < versions +{ + .crc = 0x45e4617b, + .name = "no_llseek", +}, +$ .fi .P diff --git a/pahole.c b/pahole.c index 7d8431c64423..245a3f2f14f7 100644 --- a/pahole.c +++ b/pahole.c @@ -3,7 +3,7 @@ Copyright (C) 2006 Mandriva Conectiva S.A. Copyright (C) 2006 Arnaldo Carvalho de Melo <acme-4qZELD6FgxhWk0Htik3J/w@public.gmane.org> - Copyright (C) 2007-2008 Arnaldo Carvalho de Melo <acme-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> + Copyright (C) 2007- Arnaldo Carvalho de Melo <acme-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> */ #include <argp.h> @@ -804,6 +804,7 @@ ARGP_PROGRAM_VERSION_HOOK_DEF = dwarves_print_version; #define ARGP_just_structs 310 #define ARGP_count 311 #define ARGP_skip 312 +#define ARGP_seek_bytes 313 static const struct argp_option pahole__options[] = { { @@ -836,6 +837,12 @@ static const struct argp_option pahole__options[] = { .arg = "COUNT", .doc = "Skip COUNT input records" }, + { + .name = "seek_bytes", + .key = ARGP_seek_bytes, + .arg = "BYTES", + .doc = "Seek COUNT input records" + }, { .name = "find_pointers_to", .key = 'f', @@ -1163,6 +1170,8 @@ static error_t pahole__options_parser(int key, char *arg, conf.count = atoi(arg); break; case ARGP_skip: conf.skip = atoi(arg); break; + case ARGP_seek_bytes: + conf.seek_bytes = strtol(arg, NULL, 0); break; default: return ARGP_ERR_UNKNOWN; } @@ -1329,6 +1338,25 @@ static int tag__fprintf_value(struct tag *type, struct cu *cu, void *instance, i return tag__fprintf_hexdump_value(type, cu, instance, _sizeof, fp); } +static int pipe_seek(FILE *fp, off_t offset) +{ + char bf[4096]; + int chunk = sizeof(bf); + + if (chunk > offset) + chunk = offset; + + while (fread(bf, chunk, 1, stdin) == 1) { + offset -= chunk; + if (offset == 0) + return 0; + if (chunk > offset) + chunk = offset; + } + + return offset == 0 ? 0 : -1; +} + static int tag__stdio_fprintf_value(struct tag *type, struct cu *cu, FILE *fp) { int _sizeof = tag__size(type, cu), printed = 0; @@ -1339,6 +1367,12 @@ static int tag__stdio_fprintf_value(struct tag *type, struct cu *cu, FILE *fp) if (instance == NULL) return -ENOMEM; + if (conf.seek_bytes && pipe_seek(stdin, conf.seek_bytes) < 0) { + int err = --errno; + fprintf(stderr, "Couldn't --seek_bytes %ld\n", conf.seek_bytes); + return err; + } + while (fread(instance, _sizeof, 1, stdin) == 1) { if (skip) { --skip; ^ permalink raw reply related [flat|nested] 3+ messages in thread
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2020-07-01 11:25 ` pahole and parsing data: --count Arnaldo Carvalho de Melo
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2020-07-01 11:44 ` pahole and parsing data: --skip Arnaldo Carvalho de Melo
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2020-07-01 12:46 ` pahole and parsing data: --seek_bytes, dissecting perf.data files Arnaldo Carvalho de Melo
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