[Bugs] [Bug 1478411] Directory listings on fuse mount are very slow due to small number of getdents () entries

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1478411



--- Comment #3 from nh2 <nh2-redhatbugzilla at deditus.de> ---
And for completeness, here's the unfiltered strace that shows that in between
the writev()s there's only futex() and readv(). The readv() uses the same FD as
the writev(), so that's probably localhost fuse communication.

[pid 18266] 1501857629.747928 read(10,
"\357U>\245\325n\200#\360\22/9\370\205lL\322\226gk\233\255\2633[\10R\34j\334,'"...,
16408) = 16408
[pid 18266] 1501857629.747975 read(10, "\27\3\3@\30", 5) = 5
[pid 18266] 1501857629.748012 read(10,
"\357U>\245\325n\200$^\213\37\351\tcZ\273\352\5k_\311'\345s\261\21\37:%\364\315\227"...,
16408) = 16408
[pid 18266] 1501857629.748060 read(10, "\27\3\3@\30", 5) = 5
[pid 18266] 1501857629.748091 read(10,
"\357U>\245\325n\200%\211I\353\304\252\260\256\250t\257\247Z\5\215\7q3\232\236\217\277\373Y-"...,
16408) = 16408
[pid 18266] 1501857629.748137 read(10, "\27\3\3:P", 5) = 5
[pid 18266] 1501857629.748167 read(10,
"\357U>\245\325n\200&\3363W\353\313\273b\344/\20\230\305\265#7\30782\371e\221\365\221\17"...,
14928) = 14928
[pid 18266] 1501857629.750987 writev(8,
[{iov_base="p\16\0\0\0\0\0\0\331\311\0\0\0\0\0\0", iov_len=16},
{iov_base="\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
iov_len=3680}], 2) = 3696
[pid 18269] 1501857629.751199 <... readv resumed>
[{iov_base="P\0\0\0,\0\0\0\332\311\0\0\0\0\0\0\0.\0d\f\177\0\0\0\0\0\0\0\0\0\0"...,
iov_len=80}, {iov_base="", iov_len=131072}], 2) = 80
[pid 18269] 1501857629.751321 futex(0x7f0d0c036ab4, FUTEX_WAKE_PRIVATE, 1
<unfinished ...>
[pid 18266] 1501857629.751346 poll([{fd=13,
events=POLLIN|POLLPRI|POLLERR|POLLHUP|POLLNVAL}, {fd=10,
events=POLLIN|POLLPRI|POLLERR|POLLHUP|POLLNVAL}], 2, -1 <unfinished ...>
[pid 18269] 1501857629.751373 <... futex resumed> ) = 1
[pid 18224] 1501857629.751387 <... futex resumed> ) = 0
[pid 18269] 1501857629.751398 readv(8,  <unfinished ...>
[pid 18224] 1501857629.751410 futex(0x7f0d0c036a60, FUTEX_WAKE_PRIVATE, 1) = 0
[pid 18224] 1501857629.751459 writev(8,
[{iov_base="p\16\0\0\0\0\0\0\332\311\0\0\0\0\0\0", iov_len=16},
{iov_base="\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
iov_len=3680}], 2) = 3696
[pid 18224] 1501857629.751536 futex(0x7f0d0c036ab0,
FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, {tv_sec=1501857749,
tv_nsec=0}, 0xffffffff <unfinished ...>
[pid 18269] 1501857629.751619 <... readv resumed>
[{iov_base="P\0\0\0,\0\0\0\333\311\0\0\0\0\0\0\0.\0d\f\177\0\0\0\0\0\0\0\0\0\0"...,
iov_len=80}, {iov_base="", iov_len=131072}], 2) = 80
[pid 18269] 1501857629.751672 futex(0x7f0d0c036ab0, FUTEX_WAKE_PRIVATE, 1) = 1
[pid 18224] 1501857629.751706 <... futex resumed> ) = 0
[pid 18269] 1501857629.751715 readv(8,  <unfinished ...>
[pid 18224] 1501857629.751726 futex(0x7f0d0c036a60, FUTEX_WAKE_PRIVATE, 1) = 0
[pid 18224] 1501857629.751772 writev(8,
[{iov_base="p\16\0\0\0\0\0\0\333\311\0\0\0\0\0\0", iov_len=16},
{iov_base="\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
iov_len=3680}], 2) = 3696

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