user/sven/linux.git/include/linux/crush, branch v3.14.68

crush: add set_choose_local_[fallback_]tries steps

2013-12-31T18:32:26Z

This allows all of the tunables to be overridden by a specific rule. Reflects ceph.git commits d129e09e57fbc61cfd4f492e3ee77d0750c9d292, 0497db49e5973b50df26251ed0e3f4ac7578e66e. Signed-off-by: Ilya Dryomov Reviewed-by: Sage Weil

crush: CHOOSE_LEAF -> CHOOSELEAF throughout

2013-12-31T18:32:24Z

This aligns the internal identifier names with the user-visible names in the decompiled crush map language. Reflects ceph.git commit caa0e22e15e4226c3671318ba1f61314bf6da2a6. Signed-off-by: Ilya Dryomov Reviewed-by: Sage Weil

crush: add SET_CHOOSE_TRIES rule step

2013-12-31T18:32:23Z

Since we can specify the recursive retries in a rule, we may as well also specify the non-recursive tries too for completeness. Reflects ceph.git commit d1b97462cffccc871914859eaee562f2786abfd1. Signed-off-by: Ilya Dryomov Reviewed-by: Sage Weil

crush: apply chooseleaf_tries to firstn mode too

2013-12-31T18:32:22Z

Parameterize the attempts for the _firstn choose method, and apply the rule-specified tries count to firstn mode as well. Note that we have slightly different behavior here than with indep: If the firstn value is not specified for firstn, we pass through the normal attempt count. This maintains compatibility with legacy behavior. Note that this is usually *not* actually N^2 work, though, because of the descend_once tunable. However, descend_once is unfortunately *not* the same thing as 1 chooseleaf try because it is only checked on a reject but not on a collision. Sigh. In contrast, for indep, if tries is not specified we default to 1 recursive attempt, because that is simply more sane, and we have the option to do so. The descend_once tunable has no effect for indep. Reflects ceph.git commit 64aeded50d80942d66a5ec7b604ff2fcbf5d7b63. Signed-off-by: Ilya Dryomov Reviewed-by: Sage Weil

crush: new SET_CHOOSE_LEAF_TRIES command

2013-12-31T18:32:21Z

Explicitly control the number of sample attempts, and allow the number of tries in the recursive call to be explicitly controlled via the rule. This is important because the amount of time we want to spend looking for a solution may be rule dependent (e.g., higher for the wide indep pool than the rep pools). (We should do the same for the other tunables, by the way!) Reflects ceph.git commit c43c893be872f709c787bc57f46c0e97876ff681. Signed-off-by: Ilya Dryomov Reviewed-by: Sage Weil

crush: use breadth-first search for indep mode

2013-12-31T18:32:16Z

Reflects ceph.git commit 86e978036a4ecbac4c875e7c00f6c5bbe37282d3. Signed-off-by: Ilya Dryomov Reviewed-by: Sage Weil

crush: return CRUSH_ITEM_UNDEF for failed placements with indep

2013-12-31T18:32:15Z

For firstn mode, if we fail to make a valid placement choice, we just continue and return a short result to the caller. For indep mode, however, we need to make the position stable, and return an undefined value on failed placements to avoid shifting later results to the left. Reflects ceph.git commit b1d4dd4eb044875874a1d01c01c7d766db5d0a80. Signed-off-by: Ilya Dryomov Reviewed-by: Sage Weil

crush: eliminate CRUSH_MAX_SET result size limitation

2013-12-31T18:32:14Z

This is only present to size the temporary scratch arrays that we put on the stack. Let the caller allocate them as they wish and remove the limitation. Reflects ceph.git commit 1cfe140bf2dab99517589a82a916f4c75b9492d1. Signed-off-by: Ilya Dryomov Reviewed-by: Sage Weil

crush: factor out (trivial) crush_destroy_rule()

2013-12-31T18:32:11Z

Reflects ceph.git commit 43a01c9973c4b83f2eaa98be87429941a227ddde. Signed-off-by: Ilya Dryomov Reviewed-by: Sage Weil

crush: pass weight vector size to map function

2013-12-31T18:32:10Z

Pass the size of the weight vector into crush_do_rule() to ensure that we don't access values past the end. This can happen if the caller misbehaves and passes a weight vector that is smaller than max_devices. Currently the monitor tries to prevent that from happening, but this will gracefully tolerate previous bad osdmaps that got into this state. It's also a bit more defensive. Reflects ceph.git commit 5922e2c2b8335b5e46c9504349c3a55b7434c01a. Signed-off-by: Ilya Dryomov Reviewed-by: Sage Weil