Mercurial > hg-stable
view mercurial/cffi/osutilbuild.py @ 34885:df2ff314e36f
fsmonitor: warn when fsmonitor could be used
fsmonitor can significantly speed up operations on large working
directories. But fsmonitor isn't enabled by default, so naive users
may not realize there is a potential to make Mercurial faster.
This commit introduces a warning to working directory updates when
fsmonitor could be used.
The following conditions must be met:
* Working directory is previously empty
* New working directory adds >= N files (currently 50,000)
* Running on Linux or MacOS
* fsmonitor not enabled
* Warning not disabled via config override
Because of the empty working directory restriction, most users will
only see this warning during `hg clone` (assuming very few users
actually do an `hg up null`).
The addition of a warning may be considered a BC change. However, clone
has printed warnings before. Until recently, Mercurial printed a warning
with the server's certificate fingerprint when it wasn't explicitly
trusted for example. The warning goes to stderr. So it shouldn't
interfere with scripts parsing meaningful output.
The OS restriction was on the advice of Facebook engineers, who only
feel confident with watchman's stability on the supported platforms.
.. feature::
Print warning when fsmonitor isn't being used on a large repository
Differential Revision: https://phab.mercurial-scm.org/D894
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Wed, 18 Oct 2017 22:57:15 +0200 |
parents | 2dcb3d52ef41 |
children | 2372284d9457 |
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from __future__ import absolute_import import cffi ffi = cffi.FFI() ffi.set_source("mercurial.cffi._osutil", """ #include <sys/attr.h> #include <sys/vnode.h> #include <unistd.h> #include <fcntl.h> #include <time.h> typedef struct val_attrs { uint32_t length; attribute_set_t returned; attrreference_t name_info; fsobj_type_t obj_type; struct timespec mtime; uint32_t accessmask; off_t datalength; } __attribute__((aligned(4), packed)) val_attrs_t; """, include_dirs=['mercurial']) ffi.cdef(''' typedef uint32_t attrgroup_t; typedef struct attrlist { uint16_t bitmapcount; /* number of attr. bit sets in list */ uint16_t reserved; /* (to maintain 4-byte alignment) */ attrgroup_t commonattr; /* common attribute group */ attrgroup_t volattr; /* volume attribute group */ attrgroup_t dirattr; /* directory attribute group */ attrgroup_t fileattr; /* file attribute group */ attrgroup_t forkattr; /* fork attribute group */ ...; }; typedef struct attribute_set { ...; } attribute_set_t; typedef struct attrreference { int attr_dataoffset; int attr_length; ...; } attrreference_t; typedef int ... off_t; typedef struct val_attrs { uint32_t length; attribute_set_t returned; attrreference_t name_info; uint32_t obj_type; struct timespec mtime; uint32_t accessmask; off_t datalength; ...; } val_attrs_t; /* the exact layout of the above struct will be figured out during build time */ typedef int ... time_t; typedef struct timespec { time_t tv_sec; ...; }; int getattrlist(const char* path, struct attrlist * attrList, void * attrBuf, size_t attrBufSize, unsigned int options); int getattrlistbulk(int dirfd, struct attrlist * attrList, void * attrBuf, size_t attrBufSize, uint64_t options); #define ATTR_BIT_MAP_COUNT ... #define ATTR_CMN_NAME ... #define ATTR_CMN_OBJTYPE ... #define ATTR_CMN_MODTIME ... #define ATTR_CMN_ACCESSMASK ... #define ATTR_CMN_ERROR ... #define ATTR_CMN_RETURNED_ATTRS ... #define ATTR_FILE_DATALENGTH ... #define VREG ... #define VDIR ... #define VLNK ... #define VBLK ... #define VCHR ... #define VFIFO ... #define VSOCK ... #define S_IFMT ... int open(const char *path, int oflag, int perm); int close(int); #define O_RDONLY ... ''') if __name__ == '__main__': ffi.compile()