linux.git/tools/lib/api, branch v6.2

tools lib api: Add dependency test to install_headers

2022-12-14T14:16:12+00:00

Compute the headers to be installed from their source headers and make
each have its own build target to install it. Using dependencies
avoids headers being reinstalled and getting a new timestamp which
then causes files that depend on the header to be rebuilt.

Signed-off-by: Ian Rogers 
Cc: Alexander Shishkin 
Cc: Ingo Molnar 
Cc: Jiri Olsa 
Cc: Josh Poimboeuf 
Cc: Mark Rutland 
Cc: Masahiro Yamada 
Cc: Namhyung Kim 
Cc: Nathan Chancellor 
Cc: Nick Desaulniers 
Cc: Nicolas Schier 
Cc: Peter Zijlstra 
Cc: Stephane Eranian 
Cc: Tom Rix 
Cc: bpf@vger.kernel.org
Cc: llvm@lists.linux.dev
Link: https://lore.kernel.org/r/20221202045743.2639466-2-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo

tools lib api: Clean up install_headers

2022-11-20T14:32:23+00:00

Add missing backslash that caused an install command to always appear
in build output. Make the install headers more specific.

Signed-off-by: Ian Rogers 
Cc: Alexander Shishkin 
Cc: Alexei Starovoitov 
Cc: Andrii Nakryiko 
Cc: Daniel Borkmann 
Cc: Hao Luo 
Cc: Ingo Molnar 
Cc: Jiri Olsa 
Cc: John Fastabend 
Cc: KP Singh 
Cc: Mark Rutland 
Cc: Martin KaFai Lau 
Cc: Masahiro Yamada 
Cc: Namhyung Kim 
Cc: Nicolas Schier 
Cc: Peter Zijlstra 
Cc: Song Liu 
Cc: Stanislav Fomichev 
Cc: Stephane Eranian 
Cc: Yonghong Song 
Cc: bpf@vger.kernel.org
Link: https://lore.kernel.org/r/20221117004356.279422-2-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo

tools lib api: Add missing install headers

2022-11-16T15:17:15+00:00

Headers necessary for the perf build.

Signed-off-by: Ian Rogers 
Acked-by: Namhyung Kim 
Cc: Alexander Shishkin 
Cc: Andrii Nakryiko 
Cc: Jiri Olsa 
Cc: Mark Rutland 
Cc: Masahiro Yamada 
Cc: Nick Desaulniers 
Cc: Nicolas Schier 
Cc: Peter Zijlstra 
Cc: Stephane Eranian 
Cc: bpf@vger.kernel.org
Link: http://lore.kernel.org/lkml/20221109184914.1357295-8-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo

tools lib api: Add install target

2022-11-16T15:17:15+00:00

This allows libapi to be installed as a dependency.

Signed-off-by: Ian Rogers 
Acked-by: Namhyung Kim 
Cmc: Alexander Shishkin 
Cc: Andrii Nakryiko 
Cc: Jiri Olsa 
Cc: Mark Rutland 
Cc: Masahiro Yamada 
Cc: Nick Desaulniers 
Cc: Peter Zijlstra 
Cc: Stephane Eranian 
Cc: bpf@vger.kernel.org
Cc: nicolas schier 
Link: http://lore.kernel.org/lkml/20221109184914.1357295-2-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo

tools lib api fs tracing_path: Add scandir alphasort

2022-11-15T13:24:09+00:00

tracing_events__opendir() allows iteration over files in
/tracing/events but with an arbitrary sort order.

Add a scandir alternative where the results are alphabetically sorted.

Signed-off-by: Ian Rogers 
Cc: Adrian Hunter 
Cc: Alexander Shishkin 
Cc: Caleb Biggers 
Cc: Jiri Olsa 
Cc: Kajol Jain 
Cc: Kan Liang 
Cc: Leo Yan 
Cc: Mark Rutland 
Cc: Namhyung Kim 
Cc: Perry Taylor 
Cc: Peter Zijlstra 
Cc: Ravi Bangoria 
Cc: Rob Herring 
Cc: Sandipan Das 
Cc: Stephane Eranian 
Cc: Weilin Wang 
Cc: Xin Gao 
Cc: Xing Zhengjun 
Link: http://lore.kernel.org/lkml/20221114210723.2749751-4-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo

perf record: Fix way of handling non-perf-event pollfds

2022-10-04T11:55:19+00:00

perf record __cmd_record() does not poll evlist pollfds. Instead it polls
thread_data[0].pollfd. That happens whether or not threads are being used.

perf record duplicates evlist mmap pollfds as needed for separate threads.
The non-perf-event represented by evlist->ctl_fd has to handled separately,
which is done explicitly, duplicating it into the thread_data[0] pollfds.
That approach neglects any other non-perf-event file descriptors. Currently
there is also done_fd which needs the same handling.

Add a new generalized approach.

Add fdarray_flag__non_perf_event to identify the file descriptors that
need the special handling. For those cases, also keep a mapping of the
evlist pollfd index and thread pollfd index, so that the evlist revents
can be updated.

Although this patch adds the new handling, it does not take it into use.
There is no functional change, but it is the precursor to a fix, so is
marked as a fix.

Fixes: 415ccb58f68a6beb ("perf record: Introduce thread specific data array")
Signed-off-by: Adrian Hunter 
Acked-by: Ian Rogers 
Cc: Alexey Bayduraev 
Cc: Andi Kleen 
Cc: Jiri Olsa 
Cc: Namhyung Kim 
Link: https://lore.kernel.org/r/20220824072814.16422-2-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo

Merge tag 'kbuild-v5.18-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

2022-03-31T18:59:03+00:00

Pull Kbuild updates from Masahiro Yamada:

 - Add new environment variables, USERCFLAGS and USERLDFLAGS to allow
   additional flags to be passed to user-space programs.

 - Fix missing fflush() bugs in Kconfig and fixdep

 - Fix a minor bug in the comment format of the .config file

 - Make kallsyms ignore llvm's local labels, .L*

 - Fix UAPI compile-test for cross-compiling with Clang

 - Extend the LLVM= syntax to support LLVM= form for using a
   particular version of LLVm, and LLVM= form for using custom
   LLVM in a particular directory path.

 - Clean up Makefiles

* tag 'kbuild-v5.18-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
  kbuild: Make $(LLVM) more flexible
  kbuild: add --target to correctly cross-compile UAPI headers with Clang
  fixdep: use fflush() and ferror() to ensure successful write to files
  arch: syscalls: simplify uapi/kapi directory creation
  usr/include: replace extra-y with always-y
  certs: simplify empty certs creation in certs/Makefile
  certs: include certs/signing_key.x509 unconditionally
  kallsyms: ignore all local labels prefixed by '.L'
  kconfig: fix missing '# end of' for empty menu
  kconfig: add fflush() before ferror() check
  kbuild: replace $(if A,A,B) with $(or A,B)
  kbuild: Add environment variables for userprogs flags
  kbuild: unify cmd_copy and cmd_shipped

kbuild: replace $(if A,A,B) with $(or A,B)

2022-02-15T03:25:56+00:00

$(or ...) is available since GNU Make 3.81, and useful to shorten the
code in some places.

Covert as follows:

  $(if A,A,B)  -->  $(or A,B)

This patch also converts:

  $(if A, A, B) --> $(or A, B)

Strictly speaking, the latter is not an equivalent conversion because
GNU Make keeps spaces after commas; if A is not empty, $(if A, A, B)
expands to " A", while $(or A, B) expands to "A".

Anyway, preceding spaces are not significant in the code hunks I touched.

Signed-off-by: Masahiro Yamada 
Reviewed-by: Nicolas Schier

tools lib: Introduce fdarray duplicate function

2022-02-10T19:25:20+00:00

Introduce a function to duplicate an existing file descriptor in
the fdarray structure. The function returns the position of the duplicated
file descriptor.

Reviewed-by: Riccardo Mancini 
Signed-off-by: Alexey Bayduraev 
Tested-by: Jiri Olsa 
Tested-by: Riccardo Mancini 
Acked-by: Namhyung Kim 
Cc: Adrian Hunter 
Cc: Alexander Antonov 
Cc: Alexander Shishkin 
Cc: Alexei Budankov 
Cc: Andi Kleen 
Cc: Ingo Molnar 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Link: https://lore.kernel.org/r/2891f1def287d5863cc82683a4d5879195c8d90c.1642440724.git.alexey.v.bayduraev@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo

tools api fs: Cache cgroupfs mount point

2021-02-17T18:09:08+00:00

Currently it parses the /proc file everytime it opens a file in the
cgroupfs.  Save the last result to avoid it (assuming it won't be
changed between the accesses).

Signed-off-by: Namhyung Kim 
Cc: Alexander Shishkin 
Cc: Andi Kleen 
Cc: Ian Rogers 
Cc: Jiri Olsa 
Cc: Mark Rutland 
Cc: Peter Zijlstra 
Cc: Stephane Eranian 
Link: http://lore.kernel.org/lkml/20201216090556.813996-3-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo