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Ravi Bangoria 0d33b34352 perf dso: Fix dso comparison Perf gets dso details from two different sources. 1st, from builid headers in perf.data and 2nd from MMAP2 samples. Dso from buildid header does not have dso_id detail. And dso from MMAP2 samples does not have buildid information. If detail of the same dso is present at both the places, filename is common. Previously, __dsos__findnew_link_by_longname_id() used to compare only long or short names, but Commit `0e3149f86b` ("perf dso: Move dso_id from 'struct map' to 'struct dso'") also added a dso_id comparison. Because of that, now perf is creating two different dso objects of the same file, one from buildid header (with dso_id but without buildid) and second from MMAP2 sample (with buildid but without dso_id). This is causing issues with archive, buildid-list etc subcommands. Fix this by comparing dso_id only when it's present. And incase dso is present in 'dsos' list without dso_id, inject dso_id detail as well. Before: $ sudo ./perf buildid-list -H 0000000000000000000000000000000000000000 /usr/bin/ls 0000000000000000000000000000000000000000 /usr/lib64/ld-2.30.so 0000000000000000000000000000000000000000 /usr/lib64/libc-2.30.so $ ./perf archive perf archive: no build-ids found After: $ ./perf buildid-list -H b6b1291d0cead046ed0fa5734037fa87a579adee /usr/bin/ls 641f0c90cfa15779352f12c0ec3c7a2b2b6f41e8 /usr/lib64/ld-2.30.so 675ace3ca07a0b863df01f461a7b0984c65c8b37 /usr/lib64/libc-2.30.so $ ./perf archive Now please run: $ tar xvf perf.data.tar.bz2 -C ~/.debug wherever you need to run 'perf report' on. Committer notes: Renamed is_empty_dso_id() to dso_id__empty() and inject_dso_id() to dso__inject_id() to keep namespacing consistent. Fixes: `0e3149f86b` ("perf dso: Move dso_id from 'struct map' to 'struct dso'") Reported-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Tested-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Link: http://lore.kernel.org/lkml/20200324042424.68366-1-ravi.bangoria@linux.ibm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>		2020-03-24 10:57:38 -03:00
arch	perf/x86/intel/uncore: Factor out __snr_uncore_mmio_init_box	2020-03-20 13:06:23 +01:00
block	block: Fix partition support for host aware zoned block devices	2020-03-12 07:54:39 -06:00
certs	certs: Add wrapper function to check blacklisted binary hash	2019-11-12 12:25:50 +11:00
crypto	Merge branch 'next-integrity' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity	2020-02-20 15:15:16 -08:00
Documentation	A single commit to handle an erratum in Cavium ThunderX to prevent access	2020-03-15 13:15:16 -07:00
drivers	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid	2020-03-17 09:38:03 -07:00
fs	Fix for yet another subtle futex issue. The futex code used ihold() to	2020-03-15 12:55:52 -07:00
include	Merge branch 'perf/urgent' into perf/core, to pick up fixes	2020-03-19 15:01:45 +01:00
init	Tracing updates:	2020-02-26 10:34:42 -08:00
ipc	Revert "ipc,sem: remove uneeded sem_undo_list lock usage in exit_sem()"	2020-02-21 11:22:15 -08:00
kernel	perf/core: Fix reversed NULL check in perf_event_groups_less()	2020-03-20 13:06:22 +01:00
lib	lib: Introduce generic min-heap	2020-03-06 11:56:59 +01:00
LICENSES	LICENSES: Rename other to deprecated	2019-05-03 06:34:32 -06:00
mm	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-03-12 16:19:19 -07:00
net	taprio: Fix sending packets without dequeueing them	2020-03-12 11:25:08 -07:00
samples	Kbuild updates for v5.6 (2nd)	2020-02-09 16:05:50 -08:00
scripts	parse-maintainers: Mark as executable	2020-03-06 16:29:21 -06:00
security	Merge branch 'next-integrity' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity	2020-02-20 15:15:16 -08:00
sound	ASoC: Fixes for v5.6	2020-03-07 07:24:36 +01:00
tools	perf dso: Fix dso comparison	2020-03-24 10:57:38 -03:00
usr	Kbuild updates for v5.6 (2nd)	2020-02-09 16:05:50 -08:00
virt	KVM/arm fixes for 5.6, take #1	2020-02-28 11:50:06 +01:00
.clang-format	clang-format: Update with the latest for_each macro list	2020-03-06 21:50:05 +01:00
.cocciconfig
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	selftest/lkdtm: Use local .gitignore	2020-03-02 08:39:39 -07:00
.mailmap	A handful of small documentation fixes that wandered in.	2020-02-07 13:03:10 -08:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: Hand MIPS over to Thomas	2020-02-24 22:43:18 -08:00
Kbuild	kbuild: rename hostprogs-y/always to hostprogs/always-y	2020-02-04 01:53:07 +09:00
Kconfig	docs: kbuild: convert docs to ReST and rename to *.rst	2019-06-14 14:21:21 -06:00
MAINTAINERS	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-03-12 16:19:19 -07:00
Makefile	Linux 5.6-rc6	2020-03-15 15:01:23 -07:00
README	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.