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Code Activity
Files
6ab90e201022fc5d2e9bd4b4e2caf855627558ad
coreutils/src
History
Iván Ezequiel Rodriguez 6ab90e2010 tail: improve scalability of follow-by-name directory events 
Replace the O(N) scan of watched names on each directory inotify event
with a Hash_table keyed by (parent_wd, basename), addressing the
long-standing FIXME in tail_forever_inotify.

Keep ownership consistent with wd_to_name: parent_by_name is created
only for Follow_name and returned to the caller, so fallback paths can
return without local hash cleanup.

Hash basenames with hash_string() and mix in parent_wd, matching the
existing gnulib helper rather than a hand-rolled string hash.

Matching cost for N directory events that each compare against N names
(illustrative host timings of the scan vs hash lookup alone):

  N=1000:  ~0.018s -> ~0.000s
  N=5000:  ~0.39s  -> ~0.000s
  N=10000: ~1.5s   -> ~0.000s

End-to-end recreate storms remain largely file-system bound on this
host; the hash removes the quadratic name-matching CPU from that path.

* src/tail.c (parent_name_hasher, parent_name_comparator): New.
(tail_forever_inotify): Build and use parent_by_name; return it to the
caller.
(main): Free parent_ht when non-NULL.
* tests/tail/inotify-parent-hash.sh: Require notification mode; cover
multiple names in one directory and the same basename in two
directories.
* tests/local.mk: Reference the new test.
* NEWS: Mention the improvement.
2026-10-13 14:33:22 +01:00
..
blake2
maint: prefer NULL to nullptr
2026-01-18 15:55:38 +00:00
.gitignore
maint: add coreutils_hardlinks to src/.gitignore
2025-11-19 19:23:36 -08:00
basename.c
basename: quote problematic names on tty
2026-08-01 12:38:28 +01:00
basenc.c
basenc: improve base58 encoding performance without gmplib
2026-10-08 13:45:41 +01:00
cat.c
cat: avoid redundant pipe creation and resizing
2026-04-10 22:44:22 -07:00
chcon.c
chcon,chgrp,chmod,chown,du,ls: ignore missing files while traversing
2026-07-24 13:19:23 +01:00
chmod.c
chcon,chgrp,chmod,chown,du,ls: ignore missing files while traversing
2026-07-24 13:19:23 +01:00
chown-chgrp.c
maint: prefer enums over macros for sources used for multiple programs
2025-12-20 17:25:32 -08:00
chown-chown.c
maint: prefer enums over macros for sources used for multiple programs
2025-12-20 17:25:32 -08:00
chown-core.c
chcon,chgrp,chmod,chown,du,ls: ignore missing files while traversing
2026-07-24 13:19:23 +01:00
chown-core.h
maint: prefer NULL to nullptr
2026-01-18 15:55:38 +00:00
chown.c
maint: chown,chgrp: reduce variable scope
2026-03-04 23:34:45 -08:00
chown.h
maint: prefer enums over macros for sources used for multiple programs
2025-12-20 17:25:32 -08:00
chroot.c
chroot: prefer the in-chroot primary group with --userspec=USER
2026-10-07 12:33:14 +01:00
cksum_avx2.c
maint: pacify GCC 16 -Wuseless-cast
2026-05-10 23:42:26 -07:00
cksum_avx512.c
maint: pacify GCC 16 -Wuseless-cast
2026-05-10 23:42:26 -07:00
cksum_crc.c
maint: pacify GCC 16 -Wuseless-cast
2026-05-10 23:42:26 -07:00
cksum_crc.h
cksum: prefer signed int
2026-02-27 16:18:32 -08:00
cksum_pclmul.c
maint: pacify GCC 16 -Wuseless-cast
2026-05-10 23:42:26 -07:00
cksum_vmull.c
cksum: prefer signed int
2026-02-27 16:18:32 -08:00
cksum.c
sum,cksum: consistently emit detailed write errors
2026-04-30 17:59:38 -07:00
cksum.h
build: reduce size of multi-call binary by reusing cksum logic
2025-12-13 17:18:47 +00:00
comm.c
comm: don't close standard input twice
2026-04-22 19:12:44 -07:00
copy-file-data.c
cp: --debug now reports clone/offload fail errno
2026-09-02 12:40:16 -07:00
copy.c
cp: ioctl+FICLONE EIO now fails without fallback
2026-09-03 00:57:54 -07:00
copy.h
cp: --debug now reports clone/offload fail errno
2026-09-02 12:40:16 -07:00
coreutils-arch.c
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
coreutils-chgrp.c
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
coreutils-dir.c
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
coreutils-false.c
build: reduce size of multi-call binary by reusing true logic
2026-07-19 10:53:39 -07:00
coreutils-lbracket.c
build: reduce size of multi-call binary by reusing test logic
2026-07-18 11:14:46 -07:00
coreutils-md5sum.c
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
coreutils-sha1sum.c
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
coreutils-sha224sum.c
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
coreutils-sha256sum.c
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
coreutils-sha384sum.c
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
coreutils-sha512sum.c
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
coreutils-vdir.c
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
coreutils.c
doc: all: use option highlighting and more standard alignment
2026-01-21 13:51:40 +00:00
cp-hash.c
maint: pacify GCC 16 -Wuseless-cast
2026-05-10 23:42:26 -07:00
cp-hash.h
cp: simplify cp/install/ln/mv pacification
2022-01-31 12:07:39 -08:00
cp.c
doc: cp: group related -HLP descriptions
2026-01-21 13:51:58 +00:00
csplit.c
maint: ptx,csplit: use the COUNTED_BY attribute for heap buffers
2026-10-13 12:37:27 +01:00
cut.c
maint: move utf8 specific routines to a new utf8 module
2026-10-03 15:47:15 +01:00
date.c
doc: date: group format sequences by function
2026-05-09 17:47:47 +01:00
dcgen
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
dd.c
dd: revert previous patch
2026-06-20 13:30:34 -07:00
df.c
maint: pacify GCC 16 -Wuseless-cast
2026-05-10 23:42:26 -07:00
dircolors.c
doc: all: use option highlighting and more standard alignment
2026-01-21 13:51:40 +00:00
dircolors.hin
dircolors: register the .bz3 compression format
2026-09-23 13:53:41 +01:00
dirname.c
dirname: quote problematic names on tty
2026-08-02 11:13:24 -07:00
du-tests
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
du.c
du: quote problematic names on tty
2026-08-01 12:38:28 +01:00
echo.c
doc: apply man page formatting suggestions from manpage-l10n
2026-04-25 19:04:12 +01:00
env.c
env: avoid an ioctl() call when not outputting
2026-10-12 20:55:24 +01:00
expand-common.c
maint: space between ‘char’ and ‘*’
2026-01-28 11:25:36 -08:00
expand-common.h
doc: all: use option highlighting and more standard alignment
2026-01-21 13:51:40 +00:00
expand.c
all: use more consistent blank character determination
2026-03-10 16:30:52 +00:00
expr.c
maint: expr: remove unnecessary xstrtol.h include
2026-05-15 19:11:37 -07:00
extract-magic
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
factor.c
maint: factor: use the COUNTED_BY attribute for the list of factors
2026-10-03 15:40:46 -07:00
find-mount-point.c
stat,df: remove an unnecessary alloca
2026-02-04 16:42:26 -08:00
find-mount-point.h
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
fmt.c
fmt: improve --goal error message
2026-10-07 12:33:44 +01:00
fold.c
maint: fold: remove persistent character width handling
2026-10-07 12:40:21 +01:00
force-link.c
maint: prefer NULL to nullptr
2026-01-18 15:55:38 +00:00
force-link.h
maint: add function attributes to .h files
2021-10-31 22:36:46 -07:00
fts-missing.h
chcon,chgrp,chmod,chown,du,ls: ignore missing files while traversing
2026-07-24 13:19:23 +01:00
getlimits.c
maint: pacify GCC 16 -Wuseless-cast
2026-05-10 23:42:26 -07:00
group-list.c
maint: prefer NULL to nullptr
2026-01-18 15:55:38 +00:00
group-list.h
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
groups.c
id: avoid unnecessary buffer flushing
2026-02-27 16:18:32 -08:00
head.c
head,tail: quote name in file headers appropriately
2026-05-25 16:07:05 +01:00
hostid.c
doc: all: use option highlighting and more standard alignment
2026-01-21 13:51:40 +00:00
hostname.c
doc: all: use option highlighting and more standard alignment
2026-01-21 13:51:40 +00:00
id.c
tests: avoid false failures on SELinux disabled containers
2026-09-18 16:27:54 +01:00
install.c
install: avoid redundant metadata updates with -C
2026-07-16 12:28:03 +01:00
ioblksize.h
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
iopoll.c
tee: fix infinite loop when write returns EAGAIN and short write errors
2026-05-18 20:50:48 -07:00
iopoll.h
tee: fix infinite loop when write returns EAGAIN and short write errors
2026-05-18 20:50:48 -07:00
join.c
maint: join: use the COUNTED_BY attribute
2026-09-29 18:47:27 -07:00
kill.c
doc: all: use option highlighting and more standard alignment
2026-01-21 13:51:40 +00:00
libstdbuf.c
maint: prefer NULL to nullptr
2026-01-18 15:55:38 +00:00
link.c
doc: all: use option highlighting and more standard alignment
2026-01-21 13:51:40 +00:00
ln.c
maint: ln: prefer static initialization
2026-02-19 20:36:47 -08:00
local.mk
maint: remove unnecessary configure checks for libdl and dlopen
2026-10-11 13:57:19 -07:00
logname.c
doc: all: use option highlighting and more standard alignment
2026-01-21 13:51:40 +00:00
longlong.h
maint: sync longlong.h from gmp
2025-05-12 01:28:48 -07:00
ls-dir.c
maint: prefer enums over macros for sources used for multiple programs
2025-12-20 17:25:32 -08:00
ls-ls.c
maint: prefer enums over macros for sources used for multiple programs
2025-12-20 17:25:32 -08:00
ls-vdir.c
maint: prefer enums over macros for sources used for multiple programs
2025-12-20 17:25:32 -08:00
ls.c
maint: ls: refactor extended info lookup
2026-10-13 11:35:40 +01:00
ls.h
maint: prefer enums over macros for sources used for multiple programs
2025-12-20 17:25:32 -08:00
make-prime-list.c
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
mkdir.c
doc: all: use option highlighting and more standard alignment
2026-01-21 13:51:40 +00:00
mkfifo.c
doc: all: use option highlighting and more standard alignment
2026-01-21 13:51:40 +00:00
mknod.c
doc: all: use option highlighting and more standard alignment
2026-01-21 13:51:40 +00:00
mktemp.c
mktemp: prefer rmdir and unlink to remove
2026-04-11 09:58:13 -07:00
mv.c
mv: emit warnings when copying extended attributes fails with ENOTSUP
2026-08-16 20:09:19 -07:00
nice.c
doc: all: use option highlighting and more standard alignment
2026-01-21 13:51:40 +00:00
nl.c
maint: nl: prefer static initialization
2026-02-19 20:36:40 -08:00
nohup.c
nohup: port to mingw
2026-06-07 16:43:50 -07:00
nproc.c
doc: nproc: mention OpenMP env vars in --help
2026-01-24 13:49:03 +00:00
numfmt.c
maint: move utf8 specific routines to a new utf8 module
2026-10-03 15:47:15 +01:00
octhexdigits.h
maint: prefer inline functions to maros
2026-08-15 14:09:04 -07:00
od.c
maint: od: fix -Wformat when DEBUG is defined
2026-10-02 21:46:20 -07:00
operand2sig.c
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
operand2sig.h
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
paste.c
doc: paste: improve the wording of --help
2026-09-14 20:25:17 -07:00
pathchk.c
doc: all: use option highlighting and more standard alignment
2026-01-21 13:51:40 +00:00
pinky.c
pinky: don't print output in the wrong order when fully buffered
2026-04-28 18:28:25 -07:00
pr.c
pr: improve error message for -e,-i,-n character parsing
2026-10-11 15:25:16 +01:00
printenv.c
env,printenv: support --quoting-style to control quoting
2026-09-17 08:52:12 +01:00
printenv.h
printenv,env: quote problematic variables
2026-08-05 21:29:35 -07:00
printf.c
doc: printf: fix typos in format examples
2026-08-29 14:03:37 +01:00
prog-fprintf.c
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
prog-fprintf.h
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
ptx.c
maint: ptx,csplit: use the COUNTED_BY attribute for heap buffers
2026-10-13 12:37:27 +01:00
pwd.c
maint: pwd: use the COUNTED_BY attribute on the constructed file name
2026-10-03 15:40:46 -07:00
readlink.c
readlink: quote problematic names on tty
2026-08-01 12:38:28 +01:00
realpath.c
realpath: quote problematic names on tty
2026-08-01 12:38:28 +01:00
relpath.c
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
relpath.h
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
remove.c
maint: prefer NULL to nullptr
2026-01-18 15:55:38 +00:00
remove.h
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
rm.c
doc: all: use option highlighting and more standard alignment
2026-01-21 13:51:40 +00:00
rmdir.c
maint: rmdir: prefer static initialization
2026-02-19 20:35:35 -08:00
runcon.c
doc: all: use option highlighting and more standard alignment
2026-01-21 13:51:40 +00:00
selinux.c
maint: prefer NULL to nullptr
2026-01-18 15:55:38 +00:00
selinux.h
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
seq.c
maint: seq: prefer static initialization
2026-02-19 20:53:20 -08:00
set-fields.c
maint: prefer xreallocarray when reallocating an array
2026-08-17 19:56:30 -07:00
set-fields.h
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
show-date.c
date: avoid a duplicated write error diagnotic
2025-11-03 13:00:32 +00:00
show-date.h
maint: factor out the common show_date functionality
2024-05-05 17:50:14 +01:00
shred.c
shred: preserve the ENXIO errno from open
2026-05-19 18:16:21 -07:00
shuf.c
shuf: prefer fwrite over fputs and fputc
2026-05-07 23:32:52 -07:00
sleep.c
doc: all: use option highlighting and more standard alignment
2026-01-21 13:51:40 +00:00
sort.c
build: sort: explicitly tag libcrypto dependency
2026-09-06 23:16:55 +01:00
speedgen
maint: port speedgen to FreeBSD 15
2025-07-09 17:12:40 -07:00
splice.h
build: fix build failure on AIX
2026-04-16 22:05:13 +01:00
split.c
maint: remove last remaining assert()
2026-04-09 21:36:43 +01:00
stat.c
stat,tail: recognize failfs file system type
2026-09-07 18:15:24 +01:00
statx.h
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
stdbuf.c
maint: change inappropriate uses of unreachable()
2026-08-18 12:25:21 +01:00
stty.c
stty: handle kernel speed encoding variations
2026-09-01 19:12:42 +01:00
sum.c
cksum: prefer signed int
2026-02-27 16:18:32 -08:00
sum.h
cksum: prefer signed int
2026-02-27 16:18:32 -08:00
sync.c
maint: change inappropriate uses of unreachable()
2026-08-18 12:25:21 +01:00
system.h
all: only markup --help when outputting to tty
2026-10-10 21:02:48 +01:00
tac-pipe.c
maint: prefer NULL to nullptr
2026-01-18 15:55:38 +00:00
tac.c
tac: avoid unnecessary standard output buffering
2026-03-21 15:50:33 -07:00
tail.c
tail: improve scalability of follow-by-name directory events
2026-10-13 14:33:22 +01:00
tee.c
tee: fix infinite loop when write returns EAGAIN and short write errors
2026-05-18 20:50:48 -07:00
temp-stream.c
maint: prefer NULL to nullptr
2026-01-18 15:55:38 +00:00
temp-stream.h
tac: fall back to /tmp if $TMPDIR is unavailable
2023-07-18 23:10:40 +01:00
term-sig.h
csplit,ls,sort: handle a more complete set of signals
2025-11-22 12:43:28 +00:00
termios.c
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
test-lbracket.c
build: reduce size of multi-call binary by reusing test logic
2026-07-18 11:14:46 -07:00
test-test.c
build: reduce size of multi-call binary by reusing test logic
2026-07-18 11:14:46 -07:00
test.c
test: handle adjacent binary operators
2026-07-26 12:44:01 -07:00
test.h
build: reduce size of multi-call binary by reusing test logic
2026-07-18 11:14:46 -07:00
timeout.c
timeout: don't fail to build with non-Linux prctl implementations
2026-10-10 21:44:39 -07:00
touch.c
maint: touch: prefer timespec_cmp
2026-04-08 22:34:13 -07:00
tr.c
tr: accept undocumented -u for FreeBSD / macOS compat
2026-10-10 21:02:40 +01:00
true-false.c
build: reduce size of multi-call binary by reusing true logic
2026-07-19 10:53:39 -07:00
true-true.c
build: reduce size of multi-call binary by reusing true logic
2026-07-19 10:53:39 -07:00
true.c
build: reduce size of multi-call binary by reusing true logic
2026-07-19 10:53:39 -07:00
true.h
build: reduce size of multi-call binary by reusing true logic
2026-07-19 10:53:39 -07:00
truncate.c
truncate: don't hang with --reference=FIFO
2026-08-13 22:32:56 -07:00
tsort.c
maint: change inappropriate uses of unreachable()
2026-08-18 12:25:21 +01:00
tty.c
maint: tty: prefer static initialization
2026-02-19 20:35:19 -08:00
uname-arch.c
maint: prefer enums over macros for sources used for multiple programs
2025-12-20 17:25:32 -08:00
uname-uname.c
maint: prefer enums over macros for sources used for multiple programs
2025-12-20 17:25:32 -08:00
uname.c
uname: add -A,--all-labeled to print labeled lines
2026-08-12 15:42:48 +01:00
uname.h
maint: prefer enums over macros for sources used for multiple programs
2025-12-20 17:25:32 -08:00
unexpand.c
unexpand: fix heap overflow on negative-width whitespace
2026-10-03 23:31:49 +01:00
uniq.c
uniq: avoid locking standard output when printing line counts with -c
2026-06-28 19:44:00 -07:00
unlink.c
doc: all: use option highlighting and more standard alignment
2026-01-21 13:51:40 +00:00
uptime.c
uptime: remove extraneous space
2026-07-20 19:46:41 +01:00
users.c
doc: all: use option highlighting and more standard alignment
2026-01-21 13:51:40 +00:00
wc_avx2.c
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
wc_avx512.c
maint: run 'make update-copyright'
2026-01-01 10:56:16 -08:00
wc_neon.c
wc: make sure input buffer for neon 'wc -l' is aligned
2026-03-16 12:20:38 -07:00
wc.c
wc: fix buffer boundary calculations
2026-10-07 23:26:45 -07:00
wc.h
wc: add aarch64 Neon optimization for wc -l
2026-02-18 20:09:44 -08:00
who.c
maint: remove unnecessary return statements
2026-03-28 12:48:38 -07:00
whoami.c
doc: all: use option highlighting and more standard alignment
2026-01-21 13:51:40 +00:00
yes.c
yes: make operation independent of pipe size
2026-04-17 16:15:08 +01:00