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We don't need all of Samba just to dump contents of this tdb, make
exporting profile information cheaper.
No direct use yet, but it's a good cleanup IMHO
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Wed Jun 14 00:26:55 UTC 2023 on atb-devel-224
Useful if you want to stat/fstat/lstat relative to a directory without
doing chdir first.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This no longer calls flock, so it should not be part of the system call
profiling.
Signed-off-by: Christof Schmitt <cs@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Currently identical to SMB_VFS_GET_NT_ACL().
Next, add to all VFS modules that implement
get_nt_acl and eventually remove get_nt_acl.
NB. Modules that use smb_vfs_assert_all_fns()
have SMB_VFS_GET_NT_ACL_AT() will not build
until they have this function added.
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Since this was written, our write path has changed significantly. In
particular we have gained very flexible support for async I/O, with the
linux io_uring in the pipeline. Caching stuff in main memory and then
doing a blocking pwrite nowadays does not belong into the core smbd
code. If someone wants it back, it should be doable in a VFS module.
Removes: "write cache size" parameter.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Wed Nov 13 00:20:55 UTC 2019 on sn-devel-184
No longer used anywhere.
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Böhme <slow@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Tue Oct 15 20:07:51 UTC 2019 on sn-devel-184
All users now use SMB_VFS_UNLINKAT(..., AT_REMOVEDIR).
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Thu Oct 10 07:26:43 UTC 2019 on sn-devel-184
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Thu Sep 26 18:40:53 UTC 2019 on sn-devel-184
Currently identical to SMB_VFS_UNLINK().
Next, add to all VFS modules that implement
unlink and eventually remove unlink.
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Wed Sep 11 19:44:44 UTC 2019 on sn-devel-184
Currently identical to SMB_VFS_MKDIR().
Next, add to all VFS modules that implement
mkdir and eventually remove mkdir.
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Missed as part of the previous replacement of symlink -> symlinkat.
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Currently identical to SMB_VFS_SYMLINK().
Next, add to all VFS modules that implement
symlink and eventually remove symlink.
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Böhme <slow@samba.org>
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Böhme <slow@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Fri Aug 23 20:06:22 UTC 2019 on sn-devel-184
Currently identical to SMB_VFS_READLINK().
Next, add to all VFS modules that implement
readlink and eventually remove readlink.
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Böhme <slow@samba.org>
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Böhme <slow@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Thu Aug 22 19:17:07 UTC 2019 on sn-devel-184
Currently identical to SMB_VFS_MKNOD().
Next, add to all VFS modules that implement
mknod and eventually remove mknod.
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Böhme <slow@samba.org>
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Böhme <slow@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Tue Aug 20 22:26:17 UTC 2019 on sn-devel-184
Currently identical to SMB_VFS_LINK().
Next, move add to all VFS modules that implement
link and eventually remove link.
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Böhme <slow@samba.org>
Currently identical to SMB_VFS_RENAME() - uses
AT_FDCWD for both src and dst directories.
Next, move add to all VFS modules that implement
rename and eventually remove rename.
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
This is a get-timestamp macro which works only when
profiling is enabled in the build. The underlying
clock_gettime_mono() function can be costly on some
architectures and we want to avoid it if it's not
necessary.
Signed-off-by: Uri Simchoni <uri@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
The consolidation will soon be done by a separate process. We need to
avoid the getpid() call in smbprofile_cleanup().
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
What?
This patch gets rid of the central shared memory segment referenced by
"profile_p". Instead, every smbd gets a static profile_area where it collects
profiling data. Once a second, every smbd writes this profiling data into a
record of its own in a "smbprofile.tdb". smbstatus -P does a tdb_traverse on this
database and sums up what it finds.
Why?
At least in my perception sysv IPC has not the best reputation on earth. The
code before this patch uses shmat(). Samba ages ago has developed a good
abstraction of shared memory: It's called tdb.
The main reason why I started this is that I have a request to become
more flexible with profiling data. Samba should be able to collect data
per share or per user, something which is almost impossible to do with
a fixed structure. My idea is to for example install a profile area per
share and every second marshall this into one tdb record indexed by share
name. smbstatus -P would then also collect the data and either aggregate
them or put them into individual per-share statistics. This flexibility
in the data model is not really possible with one fixed structure.
But isn't it slow?
Well, I don't think so. I can't really prove it, but I do believe that on large
boxes atomically incrementing a shared memory value for every SMB does show up
due to NUMA effects. With this patch the hot code path is completely
process-local. Once a second every smbd writes into a central tdb, this of
course does atomic operations. But it's once a second, not on every SMB2 read.
There's two places where I would like to improve things: With the current code
all smbds wake up once a second. With 10,000 potentially idle smbds this will
become noticable. That's why the current only starts the timer when something has
changed.
The second place is the tdb traverse: Right now traverse is blocking in the
sense that when it has to switch hash chains it will block. With mutexes, this
means a syscall. I have a traverse light in mind that works as follows: It
assumes a locked hash chain and then walks the complete chain in one run
without unlocking in between. This way the caller can do nonblocking locks in
the first round and only do blocking locks in a second round. Also, a lot of
syscall overhead will vanish. This way smbstatus -P will have almost zero
impact on normal operations.
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Volker Lendecke <vl@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Wed Nov 19 23:13:10 CET 2014 on sn-devel-104
This improves profiling and corrently counts the total and idle time for async
requests.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
We now autogenerate a lot of code using
SMBPROFILE_STATS_ALL_SECTIONS macro which expands to
different SMBPROFILE_STATS_{COUNT,BASIC,BYTES,IOBYTES} macros.
This also allows async profiling using:
struct mystate {
...
SMBPROFILE_BASIC_ASYNC_STATE(profile_state);
...
};
...
SMBPROFILE_BASIC_ASYNC_START(SMB2_negotiate, profile_p, mystate->profile_state);
...
SMBPROFILE_BYTES_ASYNC_SET_IDLE(mystate->profile_state);
...
SMBPROFILE_BYTES_ASYNC_SET_BUSY(mystate->profile_state);
...
SMBPROFILE_BASIC_ASYNC_END(mystate->profile_state);
The current START_PROFILE*()/END_PROFILE*() are implemented as legacy wrappers.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
In order to have useful profiling counters should never be decremented.
We need a separate counter for deallocation events.
The current value can be calculated by allocations - deallocations.
We also use better names and avoid having an array for the flush reasons.
This will simplify further profiling improvements a lot.
The value writecache_num_write_caches (this was similar to writecache_allocations)
is replaced by writecache_cached_writes, which counts the amount of writes which
were completely handled by the cache.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
