> The option 'maxmem' ('mm') is used to set the maximum memory used for one
> buffer (in kilobytes). 'maxmemtot' is used to set the maximum memory used for
> all buffers (in kilobytes). The defaults depend on the system used. These
> are not hard limits, but tell Vim when to move text into a swap file. If you
> don't like Vim to swap to a file, set 'maxmem' and 'maxmemtot' to a very large
> value. The swap file will then only be used for recovery. If you don't want
> a swap file at all, set 'updatecount' to 0, or use the "-n" argument when
> starting Vim.
On today's systems these values are huge (4GB in my machine with 8GB of RAM
since it's set as half the available memory by default) so the limits are
never reached in practice, but Vim wastes a lot of time checking if the limit
was reached.
If the limit is reached Vim starts saving pieces of the swap file that were in
memory to the disk. Said in a different way: Vim implements its own memory
swapping mechanism. This is unnecessary and inefficient since the operating
system already virtualized the memory and will swap to the disk if programs
start using too much memory.
This change does...
1. Reduce the number of config options and need for documentation.
2. Make the code more efficient as we don't have to keep track of memory usage
nor check if the memory limits were reached to start swapping to disk every
time we need memory for buffers.
3. Simplify the code. Once `memfile.c` is simple enough it could be replaced by
actual operating system memory mapping (`mmap`, `MemoryViewOfFile`...).
This change does not prevent Vim to recover changes from swap files since the
swapping code is never triggered with the huge limits set by default.
A recent refactor left cpy without a NUL terminator, simplify the code
instead of patching over it.
Instead of plain memcpy, it'd be better to employ harder to misuse string
functions made for this purpose like xstrlcpy(), but path_tail() takes
char_u arguments and returns them, leading to a lot of ugly casting.
Fixes#6431.
Adds os_strerror() result to a number of places. Also since I could not track
where err\* variables are NULL and where they are not, using macros to make sure
that all three variables are set at once.
Removes #ifdef UNIX around the use of os_fsync, makes it use os_close in place
of close in some places.
If we get a mouse_on/mouse_off event, but the mouse is already in the
corresponding state, there's no need to send the event up to the
terminal.
Closes#4394
For now only supports valid hex colors (does not check for the validity
the hex color) when termguicolors is set, otherwise it won't attempt to
change the cursor color.
