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...m * + +Recently used clean blocks are discarded. + +=item * + +(Lowest priority / last to be reclaimed.) +Recently used dirty blocks are flushed to the plugin and discarded. + +=back + =head1 ENVIRONMENT VARIABLES =over 4 diff --git a/filters/cache/cache.h b/filters/cache/cache.h index 50416b1..233a4fa 100644 --- a/filters/cache/cache.h +++ b/filters/cache/cache.h @@ -34,6 +34,8 @@ #ifndef NBDKIT_CACHE_H #define NBDKIT_CACHE_H +#include <fcntl.h> + /* Size of a block in the cache. A 4K block size means that we need * 64 MB of memory to store the bitmaps for a 1 TB underlying image....

...set +S<0 E<lt> low E<lt> high>. The thresholds are expressed as integer +percentages of C<cache-max-size>. + +Least recently used blocks are discarded first. + =head1 ENVIRONMENT VARIABLES =over 4 diff --git a/filters/cache/cache.h b/filters/cache/cache.h index 50416b1..233a4fa 100644 --- a/filters/cache/cache.h +++ b/filters/cache/cache.h @@ -34,6 +34,8 @@ #ifndef NBDKIT_CACHE_H #define NBDKIT_CACHE_H +#include <fcntl.h> + /* Size of a block in the cache. A 4K block size means that we need * 64 MB of memory to store the bitmaps for a 1 TB underlying image....

Patch 1 is the same as last time, except for a minor comment fix. Patch 2 should address everything that Eric mentioned in his review, and has been retested. Rich.

These are essentially identical to what was previously posted as patches 6/9 through 9/9 here: https://www.redhat.com/archives/libguestfs/2018-December/msg00145.html except that it has been rebased onto the current git master and retested thoroughly. Rich.

This patch series enhances the cache filter in a few ways, primarily adding a "cache-on-read" feature (similar to qemu's copyonread); and adding the ability to limit the cache size and the antecedent of that which is having a method to reclaim cache blocks. As the cache is stored as a sparse temporary file, reclaiming cache blocks simply means punching holes in the temporary file.