Mercurial > hg-stable
view mercurial/mpatch.h @ 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 | 761355833867 |
children | d86908050375 |
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#ifndef _HG_MPATCH_H_ #define _HG_MPATCH_H_ #define MPATCH_ERR_NO_MEM -3 #define MPATCH_ERR_CANNOT_BE_DECODED -2 #define MPATCH_ERR_INVALID_PATCH -1 struct mpatch_frag { int start, end, len; const char *data; }; struct mpatch_flist { struct mpatch_frag *base, *head, *tail; }; int mpatch_decode(const char *bin, ssize_t len, struct mpatch_flist **res); ssize_t mpatch_calcsize(ssize_t len, struct mpatch_flist *l); void mpatch_lfree(struct mpatch_flist *a); int mpatch_apply(char *buf, const char *orig, ssize_t len, struct mpatch_flist *l); struct mpatch_flist * mpatch_fold(void *bins, struct mpatch_flist *(*get_next_item)(void *, ssize_t), ssize_t start, ssize_t end); #endif