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    SubjectRe: [PATCH v5 06/13] lockdep: Implement crossrelease feature
    On Fri, Mar 03, 2017 at 10:13:38AM +0100, Peter Zijlstra wrote:
    > On Fri, Mar 03, 2017 at 09:14:16AM +0100, Peter Zijlstra wrote:
    >
    > > That said; I'd be fairly interested in numbers on how many links this
    > > avoids, I'll go make a check_redundant() version of the above and put a
    > > proper counter in so I can see what it does for a regular boot etc..
    >
    > Two boots + a make defconfig, the first didn't have the redundant bit
    > in, the second did (full diff below still includes the reclaim rework,
    > because that was still in that kernel and I forgot to reset the tree).
    >
    >
    > lock-classes: 1168 1169 [max: 8191]
    > direct dependencies: 7688 5812 [max: 32768]
    > indirect dependencies: 25492 25937
    > all direct dependencies: 220113 217512
    > dependency chains: 9005 9008 [max: 65536]
    > dependency chain hlocks: 34450 34366 [max: 327680]
    > in-hardirq chains: 55 51
    > in-softirq chains: 371 378
    > in-process chains: 8579 8579
    > stack-trace entries: 108073 88474 [max: 524288]
    > combined max dependencies: 178738560 169094640
    >
    > max locking depth: 15 15
    > max bfs queue depth: 320 329
    >
    > cyclic checks: 9123 9190
    >
    > redundant checks: 5046
    > redundant links: 1828
    >
    > find-mask forwards checks: 2564 2599
    > find-mask backwards checks: 39521 39789
    >

    OK, last email, I promise, then I'll go bury myself in futexes.

    find-mask forwards checks: 2999
    find-mask backwards checks: 56134

    Is with a clean kernel, which shows how many __bfs() calls we save by
    doing away with that RECLAIM state. OTOH:

    lock-classes: 1167 [max: 8191]
    direct dependencies: 7254 [max: 32768]
    indirect dependencies: 23763
    all direct dependencies: 219093

    Shows that the added reclaim class isn't entirely free either ;-)

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