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Alexei Starovoitov 89dc8d0c38 samples/bpf: Reduce syscall overhead in map_perf_test. 
Make map_perf_test for preallocated and non-preallocated hash map
spend more time inside bpf program to focus performance analysis
on the speed of update/lookup/delete operations performed by bpf program.

It makes 'perf report' of bpf_mem_alloc look like:
 11.76%  map_perf_test    [k] _raw_spin_lock_irqsave
 11.26%  map_perf_test    [k] htab_map_update_elem
  9.70%  map_perf_test    [k] _raw_spin_lock
  9.47%  map_perf_test    [k] htab_map_delete_elem
  8.57%  map_perf_test    [k] memcpy_erms
  5.58%  map_perf_test    [k] alloc_htab_elem
  4.09%  map_perf_test    [k] __htab_map_lookup_elem
  3.44%  map_perf_test    [k] syscall_exit_to_user_mode
  3.13%  map_perf_test    [k] lookup_nulls_elem_raw
  3.05%  map_perf_test    [k] migrate_enable
  3.04%  map_perf_test    [k] memcmp
  2.67%  map_perf_test    [k] unit_free
  2.39%  map_perf_test    [k] lookup_elem_raw

Reduce default iteration count as well to make 'map_perf_test' quick enough
even on debug kernels.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220902211058.60789-5-alexei.starovoitov@gmail.com
2022-09-05 15:33:05 +02:00
..
acrn
sample/acrn: Introduce a sample of HSM ioctl interface usage
2021-02-09 10:58:19 +01:00
auxdisplay
.gitignore: prefix local generated files with a slash
2021-05-02 00:43:35 +09:00
binderfs
.gitignore: prefix local generated files with a slash
2021-05-02 00:43:35 +09:00
bpf
samples/bpf: Reduce syscall overhead in map_perf_test.
2022-09-05 15:33:05 +02:00
configfs
treewide: remove editor modelines and cruft
2021-05-07 00:26:34 -07:00
connector
.gitignore: prefix local generated files with a slash
2021-05-02 00:43:35 +09:00
coresight
coresight: syscfg: Example CoreSight configuration loadable module
2021-11-26 11:34:07 -07:00
fanotify
Add gitignore file for samples/fanotify/ subdirectory
2021-11-07 11:19:24 -08:00
fprobe
Fixes and minor clean ups for tracing:
2022-07-12 16:17:40 -07:00
ftrace
x86/ibt,ftrace: Add ENDBR to samples/ftrace
2022-03-15 10:32:38 +01:00
hidraw
.gitignore: prefix local generated files with a slash
2021-05-02 00:43:35 +09:00
hw_breakpoint
samples/hw_breakpoint: drop use of kallsyms_lookup_name()
2020-04-07 10:43:44 -07:00
kdb
kdb: Rename members of struct kdbtab_t
2021-07-27 17:05:06 +01:00
kfifo
samples/kfifo: Rename read_lock/write_lock
2021-10-13 14:36:48 +02:00
kmemleak
mm,kmemleak-test.c: move kmemleak-test.c to samples dir
2020-10-13 18:38:27 -07:00
kobject
samples/kobject: Use sysfs_emit instead of sprintf
2022-03-18 14:28:29 +01:00
kprobes
samples: Use KSYM_NAME_LEN for kprobes
2022-07-12 16:36:45 -04:00
landlock
samples/landlock: Add support for file reparenting
2022-05-23 13:28:00 +02:00
livepatch
livepatch: Reorder to use before freeing a pointer
2022-03-23 13:51:11 +01:00
mei
samples: mei: don't wait on read completion upon write.
2021-08-01 09:54:22 +02:00
nitro_enclaves
nitro_enclaves: Add fixes for checkpatch blank line reports
2021-09-14 11:11:20 +02:00
pidfd
.gitignore: prefix local generated files with a slash
2021-05-02 00:43:35 +09:00
pktgen
samples: pktgen: add trap SIGINT for printing execution result
2021-08-25 13:44:30 +01:00
qmi
samples: qmi: Constify static qmi ops
2020-11-24 17:08:47 -06:00
rpmsg
samples/rpmsg: Introduce a module parameter for message count
2019-08-26 22:10:39 -07:00
seccomp
samples/seccomp: Adjust sample to also provide kill option
2022-02-10 19:09:12 -08:00
timers
.gitignore: prefix local generated files with a slash
2021-05-02 00:43:35 +09:00
trace_events
tracing: Add example and documentation for new __vstring() macro
2022-07-24 19:11:17 -04:00
trace_printk
samples/trace_printk: Wait for IRQ work to finish
2019-12-21 16:08:22 -05:00
uhid
kbuild: introduce hostprogs-always-y and userprogs-always-y
2020-08-10 01:32:59 +09:00
user_events
user_events: Add sample code for typical usage
2022-02-10 22:38:15 -05:00
v4l
treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_168.RULE (part 2)
2022-06-10 14:51:36 +02:00
vfio-mdev
vfio/mdev: Remove mdev_parent_ops
2022-04-21 07:36:56 -04:00
vfs
.gitignore: prefix local generated files with a slash
2021-05-02 00:43:35 +09:00
watch_queue
.gitignore: prefix local generated files with a slash
2021-05-02 00:43:35 +09:00
watchdog
.gitignore: prefix local generated files with a slash
2021-05-02 00:43:35 +09:00
Kconfig
Networking changes for 5.18.
2022-03-24 13:13:26 -07:00
Makefile
Networking changes for 5.18.
2022-03-24 13:13:26 -07:00