From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Xianting Tian <xianting.tian@linux.alibaba.com>
Cc: dwarves@vger.kernel.org
Subject: Re: pahole failed to get some struct info
Date: Mon, 11 Oct 2021 15:55:20 -0300 [thread overview]
Message-ID: <YWSImJiz3VjD/ArG@kernel.org> (raw)
In-Reply-To: <9a88283d-443c-3789-b120-b2c6c56ebe55@linux.alibaba.com>
Em Sun, Oct 10, 2021 at 02:09:10PM +0800, Xianting Tian escreveu:
> Hi,
> Sorry to disturb you, when I use below command to get info about 'struct
> hvc_struct', it failed.
> $ pahole -C hvc_struct vmlinux
> die__process_function: tag not supported (INVALID)!
> die__process_unit: DW_TAG_dwarf_procedure (0x36) @ <0x4ebf4c> not handled!
> But when I try some common struct, it is OK.
> $ pahole -C task_struct vmlinux
> Could you help me how to fix the issue? thanks a lot.
Using:
⬢[acme@toolbox v5.14.0-rc6+]$ pahole --version
v1.22
I see no problems, be it from DWARF or from BTF, in the various ways to
ask for that struct:
⬢[acme@toolbox v5.14.0-rc6+]$ pahole -C hvc_struct vmlinux
struct hvc_struct {
struct tty_port port; /* 0 352 */
/* --- cacheline 5 boundary (320 bytes) was 32 bytes ago --- */
spinlock_t lock; /* 352 4 */
int index; /* 356 4 */
int do_wakeup; /* 360 4 */
/* XXX 4 bytes hole, try to pack */
char * outbuf; /* 368 8 */
int outbuf_size; /* 376 4 */
int n_outbuf; /* 380 4 */
/* --- cacheline 6 boundary (384 bytes) --- */
uint32_t vtermno; /* 384 4 */
/* XXX 4 bytes hole, try to pack */
const struct hv_ops * ops; /* 392 8 */
int irq_requested; /* 400 4 */
int data; /* 404 4 */
struct winsize ws; /* 408 8 */
struct work_struct tty_resize; /* 416 32 */
/* --- cacheline 7 boundary (448 bytes) --- */
struct list_head next; /* 448 16 */
long unsigned int flags; /* 464 8 */
/* size: 472, cachelines: 8, members: 15 */
/* sum members: 464, holes: 2, sum holes: 8 */
/* last cacheline: 24 bytes */
};
⬢[acme@toolbox v5.14.0-rc6+]$ pahole hvc_struct
struct hvc_struct {
struct tty_port port; /* 0 352 */
/* --- cacheline 5 boundary (320 bytes) was 32 bytes ago --- */
spinlock_t lock; /* 352 4 */
int index; /* 356 4 */
int do_wakeup; /* 360 4 */
/* XXX 4 bytes hole, try to pack */
char * outbuf; /* 368 8 */
int outbuf_size; /* 376 4 */
int n_outbuf; /* 380 4 */
/* --- cacheline 6 boundary (384 bytes) --- */
uint32_t vtermno; /* 384 4 */
/* XXX 4 bytes hole, try to pack */
const struct hv_ops * ops; /* 392 8 */
int irq_requested; /* 400 4 */
int data; /* 404 4 */
struct winsize ws; /* 408 8 */
struct work_struct tty_resize; /* 416 32 */
/* --- cacheline 7 boundary (448 bytes) --- */
struct list_head next; /* 448 16 */
long unsigned int flags; /* 464 8 */
/* size: 472, cachelines: 8, members: 15 */
/* sum members: 464, holes: 2, sum holes: 8 */
/* last cacheline: 24 bytes */
};
⬢[acme@toolbox v5.14.0-rc6+]$
⬢[acme@toolbox v5.14.0-rc6+]$ pahole -F dwarf -C hvc_struct vmlinux
struct hvc_struct {
struct tty_port port; /* 0 352 */
/* --- cacheline 5 boundary (320 bytes) was 32 bytes ago --- */
spinlock_t lock; /* 352 4 */
int index; /* 356 4 */
int do_wakeup; /* 360 4 */
/* XXX 4 bytes hole, try to pack */
char * outbuf; /* 368 8 */
int outbuf_size; /* 376 4 */
int n_outbuf; /* 380 4 */
/* --- cacheline 6 boundary (384 bytes) --- */
uint32_t vtermno; /* 384 4 */
/* XXX 4 bytes hole, try to pack */
const struct hv_ops * ops; /* 392 8 */
int irq_requested; /* 400 4 */
int data; /* 404 4 */
struct winsize ws; /* 408 8 */
struct work_struct tty_resize; /* 416 32 */
/* --- cacheline 7 boundary (448 bytes) --- */
struct list_head next; /* 448 16 */
long unsigned int flags; /* 464 8 */
/* size: 472, cachelines: 8, members: 15 */
/* sum members: 464, holes: 2, sum holes: 8 */
/* last cacheline: 24 bytes */
};
⬢[acme@toolbox v5.14.0-rc6+]$ pahole -F btf -C hvc_struct vmlinux
struct hvc_struct {
struct tty_port port; /* 0 352 */
/* --- cacheline 5 boundary (320 bytes) was 32 bytes ago --- */
spinlock_t lock; /* 352 4 */
int index; /* 356 4 */
int do_wakeup; /* 360 4 */
/* XXX 4 bytes hole, try to pack */
char * outbuf; /* 368 8 */
int outbuf_size; /* 376 4 */
int n_outbuf; /* 380 4 */
/* --- cacheline 6 boundary (384 bytes) --- */
uint32_t vtermno; /* 384 4 */
/* XXX 4 bytes hole, try to pack */
const struct hv_ops * ops; /* 392 8 */
int irq_requested; /* 400 4 */
int data; /* 404 4 */
struct winsize ws; /* 408 8 */
struct work_struct tty_resize; /* 416 32 */
/* --- cacheline 7 boundary (448 bytes) --- */
struct list_head next; /* 448 16 */
long unsigned int flags; /* 464 8 */
/* size: 472, cachelines: 8, members: 15 */
/* sum members: 464, holes: 2, sum holes: 8 */
/* last cacheline: 24 bytes */
};
⬢[acme@toolbox v5.14.0-rc6+]$ pahole --help | grep decl
-D, --decl_exclude=PREFIX exclude classes declared in files with PREFIX
-I, --show_decl_info Show the file and line number where the tags were
⬢[acme@toolbox v5.14.0-rc6+]$ pahole -IF dwarf -C hvc_struct vmlinux
/* Used at: /var/home/acme/git/perf/drivers/tty/hvc/hvc_console.c */
/* <65c08c8> /var/home/acme/git/perf/drivers/tty/hvc/hvc_console.h:35 */
struct hvc_struct {
struct tty_port port; /* 0 352 */
/* --- cacheline 5 boundary (320 bytes) was 32 bytes ago --- */
spinlock_t lock; /* 352 4 */
int index; /* 356 4 */
int do_wakeup; /* 360 4 */
/* XXX 4 bytes hole, try to pack */
char * outbuf; /* 368 8 */
int outbuf_size; /* 376 4 */
int n_outbuf; /* 380 4 */
/* --- cacheline 6 boundary (384 bytes) --- */
uint32_t vtermno; /* 384 4 */
/* XXX 4 bytes hole, try to pack */
const struct hv_ops * ops; /* 392 8 */
int irq_requested; /* 400 4 */
int data; /* 404 4 */
struct winsize ws; /* 408 8 */
struct work_struct tty_resize; /* 416 32 */
/* --- cacheline 7 boundary (448 bytes) --- */
struct list_head next; /* 448 16 */
long unsigned int flags; /* 464 8 */
/* size: 472, cachelines: 8, members: 15 */
/* sum members: 464, holes: 2, sum holes: 8 */
/* last cacheline: 24 bytes */
};
⬢[acme@toolbox v5.14.0-rc6+]$
next prev parent reply other threads:[~2021-10-11 18:55 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-10 6:09 pahole failed to get some struct info Xianting Tian
2021-10-11 18:55 ` Arnaldo Carvalho de Melo [this message]
2021-10-12 1:31 ` Xianting Tian
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