[Crash-utility] [PATCH 5/5] memory, zram: introduce and export readswap()
lijiang
lijiang at redhat.com
Sat Oct 24 04:56:15 UTC 2020
Hi, HATAYAMA
Thanks for the patch series.
在 2020年10月11日 09:34, crash-utility-request at redhat.com 写道:
> Date: Sun, 11 Oct 2020 10:34:38 +0900
> From: HATAYAMA Daisuke <d.hatayama at fujitsu.com>
> To: crash-utility at redhat.com
> Cc: HATAYAMA Daisuke <d.hatayama at fujitsu.com>
> Subject: [Crash-utility] [PATCH 5/5] memory, zram: introduce and
> export readswap()
> Message-ID: <1602380078-27010-6-git-send-email-d.hatayama at fujitsu.com>
> Content-Type: text/plain; charset="US-ASCII"
>
> try_zram_decompress() is currently exported to extension modules, but
> from a viewpoint of author of extension modules, it's better to export
> an interface to read memory on swap; difference of decompressor are
> then hidden within the interface and there is no need for extension
> modules to update accordingly each time new decompressor are added in
> the future.
>
> So let's introduce function readswap() as an interface to read memory
> on swap.
>
> Signed-off-by: HATAYAMA Daisuke <d.hatayama at fujitsu.com>
> ---
After applied this patch, I got the following compiling error. But when I
used the 'make lzo' command to compile, it doen't have any problems, which
automatically added the option '-DLZO' to compiling command.
Did you run into this compiling issue? Or is that the expected result?
BTW: Crash can be compiled successfully without this patch [PATCH 5/5].
[root at dell-pec5125-03 crash]# make
TARGET: X86_64
CRASH: 7.2.8++
GDB: 7.6
gcc -g -O2 -I. -I. -I./common -I./config -DLOCALEDIR="\"/usr/local/share/locale\"" -DCRASH_MERGE -DHAVE_CONFIG_H -I./../include/opcode -I./../opcodes/.. -I./../readline/.. -I../bfd -I./../bfd -I./../include -I../libdecnumber -I./../libdecnumber -I./gnulib/import -Ibuild-gnulib/import -DTUI=1 -Wall -Wdeclaration-after-statement -Wpointer-arith -Wformat-nonliteral -Wno-pointer-sign -Wno-unused -Wunused-value -Wunused-function -Wno-switch -Wno-char-subscripts -Wmissing-prototypes -Wdeclaration-after-statement -Wempty-body -c -o symtab.o -MT symtab.o -MMD -MP -MF .deps/symtab.Tpo symtab.c
Making init.c
gcc -g -O2 -I. -I. -I./common -I./config -DLOCALEDIR="\"/usr/local/share/locale\"" -DCRASH_MERGE -DHAVE_CONFIG_H -I./../include/opcode -I./../opcodes/.. -I./../readline/.. -I../bfd -I./../bfd -I./../include -I../libdecnumber -I./../libdecnumber -I./gnulib/import -Ibuild-gnulib/import -DTUI=1 -Wall -Wdeclaration-after-statement -Wpointer-arith -Wformat-nonliteral -Wno-pointer-sign -Wno-unused -Wunused-value -Wunused-function -Wno-switch -Wno-char-subscripts -Wmissing-prototypes -Wdeclaration-after-statement -Wempty-body -c -o init.o -MT init.o -MMD -MP -MF .deps/init.Tpo init.c
cc -c -g -DX86_64 -DGDB_7_6 build_data.c
cc -c -g -DX86_64 -DGDB_7_6 main.c
cc -c -g -DX86_64 -DGDB_7_6 tools.c
cc -c -g -DX86_64 -DGDB_7_6 global_data.c
cc -c -g -DX86_64 -DGDB_7_6 memory.c
cc -c -g -DX86_64 -DGDB_7_6 filesys.c
cc -c -g -DX86_64 -DGDB_7_6 help.c
cc -c -g -DX86_64 -DGDB_7_6 task.c
cc -c -g -DX86_64 -DGDB_7_6 kernel.c
cc -c -g -DX86_64 -DGDB_7_6 test.c
cc -c -g -DX86_64 -DGDB_7_6 gdb_interface.c
cc -c -g -DX86_64 -DGDB_7_6 net.c
cc -c -g -DX86_64 -DGDB_7_6 dev.c
cc -c -g -DX86_64 -DGDB_7_6 bpf.c
cc -c -g -DX86_64 -DGDB_7_6 alpha.c
cc -c -g -DX86_64 -DGDB_7_6 x86.c -DMCLX
cc -c -g -DX86_64 -DGDB_7_6 ppc.c
cc -c -g -DX86_64 -DGDB_7_6 ia64.c
cc -c -g -DX86_64 -DGDB_7_6 s390.c
cc -c -g -DX86_64 -DGDB_7_6 s390x.c
cc -c -g -DX86_64 -DGDB_7_6 s390dbf.c
cc -c -g -DX86_64 -DGDB_7_6 ppc64.c
cc -c -g -DX86_64 -DGDB_7_6 x86_64.c
cc -c -g -DX86_64 -DGDB_7_6 arm.c
cc -c -g -DX86_64 -DGDB_7_6 arm64.c
cc -c -g -DX86_64 -DGDB_7_6 mips.c
cc -c -g -DX86_64 -DGDB_7_6 sparc64.c
cc -c -g -DX86_64 -DGDB_7_6 extensions.c
cc -c -g -DX86_64 -DGDB_7_6 va_server.c
cc -c -g -DX86_64 -DGDB_7_6 va_server_v1.c
cc -c -g -DX86_64 -DGDB_7_6 symbols.c -I./gdb-7.6/bfd -I./gdb-7.6/include
cc -c -g -DX86_64 -DGDB_7_6 cmdline.c -I./gdb-7.6/readline
cc -c -g -DX86_64 -DGDB_7_6 lkcd_common.c
cc -c -g -DX86_64 -DGDB_7_6 lkcd_v1.c -DMCLX
cc -c -g -DX86_64 -DGDB_7_6 lkcd_v2_v3.c -DMCLX
cc -c -g -DX86_64 -DGDB_7_6 lkcd_v5.c -DMCLX
cc -c -g -DX86_64 -DGDB_7_6 lkcd_v7.c -DMCLX
cc -c -g -DX86_64 -DGDB_7_6 lkcd_v8.c -DMCLX
cc -c -g -DX86_64 -DGDB_7_6 lkcd_fix_mem.c -DMCLX
cc -c -g -DX86_64 -DGDB_7_6 s390_dump.c
cc -c -g -DX86_64 -DGDB_7_6 netdump.c
cc -c -g -DX86_64 -DGDB_7_6 diskdump.c
cc -c -g -DX86_64 -DGDB_7_6 makedumpfile.c
cc -c -g -DX86_64 -DGDB_7_6 xendump.c
cc -c -g -DX86_64 -DGDB_7_6 lkcd_x86_trace.c -DREDHAT
cc -c -g -DX86_64 -DGDB_7_6 unwind.c -DREDHAT -DUNWIND_V1 -o unwind_v1.o
cc -c -g -DX86_64 -DGDB_7_6 unwind.c -DREDHAT -DUNWIND_V2 -o unwind_v2.o
cc -c -g -DX86_64 -DGDB_7_6 unwind.c -DREDHAT -DUNWIND_V3 -o unwind_v3.o
cc -c -g -DX86_64 -DGDB_7_6 unwind_x86_32_64.c -o unwind_x86_32_64.o
cc -c -g -DX86_64 -DGDB_7_6 unwind_arm.c -o unwind_arm.o
cc -c -g -DX86_64 -DGDB_7_6 xen_hyper.c
cc -c -g -DX86_64 -DGDB_7_6 xen_hyper_command.c
cc -c -g -DX86_64 -DGDB_7_6 xen_hyper_global_data.c
cc -c -g -DX86_64 -DGDB_7_6 xen_hyper_dump_tables.c
cc -c -g -DX86_64 -DGDB_7_6 kvmdump.c
cc -c -g -DX86_64 -DGDB_7_6 qemu.c
cc -c -g -DX86_64 -DGDB_7_6 qemu-load.c
cc -c -g -DX86_64 -DGDB_7_6 sadump.c
cc -c -g -DX86_64 -DGDB_7_6 ipcs.c
cc -c -g -DX86_64 -DGDB_7_6 ramdump.c
cc -c -g -DX86_64 -DGDB_7_6 vmware_vmss.c
cc -c -g -DX86_64 -DGDB_7_6 vmware_guestdump.c
cc -c -g -DX86_64 -DGDB_7_6 xen_dom0.c
cc -c -g -DX86_64 -DGDB_7_6 kaslr_helper.c
ar -rs crashlib.a main.o tools.o global_data.o memory.o filesys.o help.o task.o build_data.o kernel.o test.o gdb_interface.o net.o dev.o bpf.o alpha.o x86.o ppc.o ia64.o s390.o s390x.o s390dbf.o ppc64.o x86_64.o arm.o arm64.o mips.o sparc64.o extensions.o remote.o va_server.o va_server_v1.o symbols.o cmdline.o lkcd_common.o lkcd_v1.o lkcd_v2_v3.o lkcd_v5.o lkcd_v7.o lkcd_v8.o lkcd_fix_mem.o s390_dump.o netdump.o diskdump.o makedumpfile.o xendump.o lkcd_x86_trace.o unwind_v1.o unwind_v2.o unwind_v3.o unwind_x86_32_64.o unwind_arm.o xen_hyper.o xen_hyper_command.o xen_hyper_global_data.o xen_hyper_dump_tables.o kvmdump.o qemu.o qemu-load.o sadump.o ipcs.o ramdump.o vmware_vmss.o vmware_guestdump.o xen_dom0.o kaslr_helper.o
ar: creating crashlib.a
gcc -g -O2 \
-o ../../crash ../../crashlib.a amd64-tdep.o amd64-linux-tdep.o i386-tdep.o i387-tdep.o i386-linux-tdep.o glibc-tdep.o solib-svr4.o symfile-mem.o linux-tdep.o linux-record.o ser-base.o ser-unix.o ser-pipe.o ser-tcp.o inf-ptrace.o fork-child.o i386-nat.o amd64-nat.o amd64-linux-nat.o linux-nat.o linux-osdata.o proc-service.o linux-thread-db.o linux-fork.o linux-procfs.o linux-ptrace.o linux-btrace.o remote.o dcache.o tracepoint.o ax-general.o ax-gdb.o remote-fileio.o remote-notif.o cli-dump.o cli-decode.o cli-script.o cli-cmds.o cli-setshow.o cli-logging.o cli-interp.o cli-utils.o mi-out.o mi-console.o mi-cmds.o mi-cmd-catch.o mi-cmd-env.o mi-cmd-var.o mi-cmd-break.o mi-cmd-stack.o mi-cmd-file.o mi-cmd-disas.o mi-symbol-cmds.o mi-cmd-target.o mi-cmd-info.o mi-interp.o mi-main.o mi-parse.o mi-getopt.o tui-command.o tui-data.o tui-disasm.o tui-file.o tui-hooks.o tui-interp.o tui-io.o tui-layout.o tui-out.o tui-regs.o tui-source.o tui-stack.o tui-win.o tui-windata.o tui-wingeneral.o tui-winsource.o tui.o python.o py-value.o py-prettyprint.o py-auto-load.o elfread.o stap-probe.o posix-hdep.o c-exp.o cp-name-parser.o ada-exp.o jv-exp.o f-exp.o go-exp.o m2-exp.o p-exp.o version.o annotate.o addrmap.o auto-load.o auxv.o agent.o bfd-target.o blockframe.o breakpoint.o break-catch-sig.o findvar.o regcache.o cleanups.o charset.o continuations.o corelow.o disasm.o dummy-frame.o dfp.o source.o value.o eval.o valops.o valarith.o valprint.o printcmd.o block.o symtab.o psymtab.o symfile.o symmisc.o linespec.o dictionary.o infcall.o infcmd.o infrun.o expprint.o environ.o stack.o thread.o exceptions.o filesystem.o inf-child.o interps.o minidebug.o main.o macrotab.o macrocmd.o macroexp.o macroscope.o mi-common.o event-loop.o event-top.o inf-loop.o completer.o gdbarch.o arch-utils.o gdbtypes.o gdb_bfd.o gdb_obstack.o osabi.o copying.o memattr.o mem-break.o target.o parse.o language.o buildsym.o findcmd.o std-regs.o signals.o exec.o reverse.o bcache.o objfiles.o observer.o minsyms.o maint.o demangle.o dbxread.o coffread.o coff-pe-re
ad.o dwarf2read.o mipsread.o stabsread.o corefile.o dwarf2expr.o dwarf2loc.o dwarf2-frame.o dwarf2-frame-tailcall.o ada-lang.o c-lang.o d-lang.o f-lang.o objc-lang.o ada-tasks.o ada-varobj.o ui-out.o cli-out.o varobj.o vec.o go-lang.o go-valprint.o go-typeprint.o jv-lang.o jv-valprint.o jv-typeprint.o m2-lang.o opencl-lang.o p-lang.o p-typeprint.o p-valprint.o sentinel-frame.o complaints.o typeprint.o ada-typeprint.o c-typeprint.o f-typeprint.o m2-typeprint.o ada-valprint.o c-valprint.o cp-valprint.o d-valprint.o f-valprint.o m2-valprint.o serial.o mdebugread.o top.o utils.o ui-file.o user-regs.o frame.o frame-unwind.o doublest.o frame-base.o inline-frame.o gnu-v2-abi.o gnu-v3-abi.o cp-abi.o cp-support.o cp-namespace.o reggroups.o regset.o trad-frame.o tramp-frame.o solib.o solib-target.o prologue-value.o memory-map.o memrange.o xml-support.o xml-syscall.o xml-utils.o target-descriptions.o target-memory.o xml-tdesc.o xml-builtin.o inferior.o osdata.o gdb_usleep.o record.o record-full.o gcore.o gdb_vecs.o jit.o progspace.o skip.o probe.o common-utils.o buffer.o ptid.o gdb-dlfcn.o common-agent.o format.o registry.o btrace.o record-btrace.o inflow.o init.o \
../readline/libreadline.a ../opcodes/libopcodes.a ../bfd/libbfd.a ../libiberty/libiberty.a ../libdecnumber/libdecnumber.a -ldl -lncurses -lz -lm -llzma ../libiberty/libiberty.a build-gnulib/import/libgnu.a -ldl -Wl,--dynamic-list=./proc-service.list -lz -ldl -rdynamic
/usr/bin/ld: ../../crashlib.a(memory.o): in function `readmem':
/home/crash/memory.c:2299: undefined reference to `readswap'
collect2: error: ld returned 1 exit status
make[3]: *** [Makefile:1188: gdb] Error 1
make[2]: *** [Makefile:245: rebuild] Error 2
make[1]: *** [Makefile:233: gdb_merge] Error 2
make: *** [Makefile:225: all] Error 2
[root at dell-pec5125-03 crash]#
Thanks.
Lianbo
> defs.h | 1 +
> diskdump.c | 67 ++++++++++++++++++++++++++++++++++++++++++++------------------
> memory.c | 5 ++++-
> 3 files changed, 53 insertions(+), 20 deletions(-)
>
> diff --git a/defs.h b/defs.h
> index c899fe2..8bb5618 100644
> --- a/defs.h
> +++ b/defs.h
> @@ -6506,6 +6506,7 @@ int diskdump_kaslr_check(void);
> QEMUCPUState *diskdump_get_qemucpustate(int);
> void diskdump_device_dump_info(FILE *);
> void diskdump_device_dump_extract(int, char *, FILE *);
> +ulong readswap(ulonglong pte_val, char *buf, ulong len, ulonglong vaddr);
> /*support for zram*/
> ulong try_zram_decompress(ulonglong pte_val, unsigned char *buf, ulong len, ulonglong vaddr);
> #ifdef LZO
> diff --git a/diskdump.c b/diskdump.c
> index cdbc2d5..3762314 100644
> --- a/diskdump.c
> +++ b/diskdump.c
> @@ -2704,24 +2704,15 @@ lookup_swap_cache(ulonglong pte_val, unsigned char *zram_buf)
> return NULL;
> }
>
> -ulong (*decompressor)(unsigned char *in_addr, ulong in_size, unsigned char *out_addr, ulong *out_size, void *other/* NOT USED */);
> -/*
> - * If userspace address was swapped out to zram, this function is called to decompress the object.
> - * try_zram_decompress returns decompressed page data and data length
> - */
> -ulong
> -try_zram_decompress(ulonglong pte_val, unsigned char *buf, ulong len, ulonglong vaddr)
> +static int get_disk_name_private_data(ulonglong pte_val,
> + ulonglong vaddr,
> + char *name,
> + ulong *private_data)
> {
> - char name[32] = {0};
> - ulonglong swp_offset;
> - ulong swap_info, bdev, bd_disk, zram, zram_table_entry, sector, index, entry, flags, size, outsize, off;
> - unsigned char *obj_addr = NULL;
> - unsigned char *zram_buf = NULL;
> - unsigned char *outbuf = NULL;
> + ulong swap_info, bdev, bd_disk;
>
> - off = PAGEOFFSET(vaddr);
> if (!symbol_exists("swap_info"))
> - return 0;
> + return FALSE;
>
> swap_info = symbol_value("swap_info");
>
> @@ -2738,16 +2729,53 @@ try_zram_decompress(ulonglong pte_val, unsigned char *buf, ulong len, ulonglong
> sizeof(void *), "swap_info_struct_bdev", FAULT_ON_ERROR);
> readmem(bdev + OFFSET(block_device_bd_disk), KVADDR, &bd_disk,
> sizeof(void *), "block_device_bd_disk", FAULT_ON_ERROR);
> - readmem(bd_disk + OFFSET(gendisk_disk_name), KVADDR, name,
> + if (name)
> + readmem(bd_disk + OFFSET(gendisk_disk_name), KVADDR, name,
> strlen("zram"), "gendisk_disk_name", FAULT_ON_ERROR);
> + if (private_data)
> + readmem(bd_disk + OFFSET(gendisk_private_data), KVADDR,
> + private_data, sizeof(void *), "gendisk_private_data",
> + FAULT_ON_ERROR);
> +
> + return TRUE;
> +}
> +
> +ulong readswap(ulonglong pte_val, char *buf, ulong len, ulonglong vaddr)
> +{
> + char name[32] = {0};
>
> - if (strncmp(name, "zram", strlen("zram"))) {
> + if (!get_disk_name_private_data(pte_val, vaddr, name, NULL))
> + return 0;
> +
> + if (!strncmp(name, "zram", 4)) {
> + return try_zram_decompress(pte_val,
> + (unsigned char *)buf,
> + len,
> + vaddr);
> + } else {
> if (CRASHDEBUG(2))
> error(WARNING,
> "this page has been swapped to %s\n",
> name);
> return 0;
> }
> +}
> +
> +ulong (*decompressor)(unsigned char *in_addr, ulong in_size, unsigned char *out_addr, ulong *out_size, void *other/* NOT USED */);
> +/*
> + * If userspace address was swapped out to zram, this function is called to decompress the object.
> + * try_zram_decompress returns decompressed page data and data length
> + */
> +ulong
> +try_zram_decompress(ulonglong pte_val, unsigned char *buf, ulong len, ulonglong vaddr)
> +{
> + char name[32] = {0};
> + ulonglong swp_offset;
> + unsigned char *obj_addr = NULL;
> + unsigned char *zram_buf = NULL;
> + unsigned char *outbuf = NULL;
> + ulong zram, zram_table_entry, sector, index, entry, flags, size,
> + outsize, off;
>
> if (INVALID_MEMBER(zram_compressor)) {
> zram_init();
> @@ -2763,8 +2791,8 @@ try_zram_decompress(ulonglong pte_val, unsigned char *buf, ulong len, ulonglong
> if (CRASHDEBUG(2))
> error(WARNING, "this page has swapped to zram\n");
>
> - readmem(bd_disk + OFFSET(gendisk_private_data), KVADDR, &zram,
> - sizeof(void *), "gendisk_private_data", FAULT_ON_ERROR);
> + if (!get_disk_name_private_data(pte_val, vaddr, NULL, &zram))
> + return 0;
>
> readmem(zram + OFFSET(zram_compressor), KVADDR, name,
> sizeof(name), "zram compressor", FAULT_ON_ERROR);
> @@ -2789,6 +2817,7 @@ try_zram_decompress(ulonglong pte_val, unsigned char *buf, ulong len, ulonglong
>
> zram_buf = (unsigned char *)GETBUF(PAGESIZE());
> /*lookup page from swap cache*/
> + off = PAGEOFFSET(vaddr);
> obj_addr = lookup_swap_cache(pte_val, zram_buf);
> if (obj_addr != NULL) {
> memcpy(buf, obj_addr + off, len);
> diff --git a/memory.c b/memory.c
> index c951827..44213bb 100644
> --- a/memory.c
> +++ b/memory.c
> @@ -2296,7 +2296,10 @@ readmem(ulonglong addr, int memtype, void *buffer, long size,
> if (cnt > size)
> cnt = size;
>
> - cnt = try_zram_decompress(paddr, (unsigned char *)bufptr, cnt, addr);
> + cnt = readswap(addr,
> + bufptr,
> + cnt,
> + addr);
> if (cnt) {
> bufptr += cnt;
> addr += cnt;
> -- 1.8.3.1
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